Motor nameplate data and rating

Motor nameplate data and rating Model: the series of varieties, the performance of the motor, protective structures, such as rotor type product code. Rated power: it means the runtime on the output mechanical power rating of the motor shaft, unit KW or HP, 1 HP = 0.736 KW. Voltage: directly to the line on the www.dongfeng-motor.com stator winding voltage (V), the motor has two kinds of Y and delta connection, the connection shall be consistent with connection of regulation of motor nameplates, to ensure that corresponding to three phase generator the rated voltage. Current: motor under rated voltage and rated frequency, and the output power rating of the stator winding current of three-phase line Frequency motor, which refer to connect ac power frequency, regulation of 50 hz + 1 in our country Speed: motor under the rated voltage, rated frequency, rated load, motor speed (r/min) per minute; The 2 pole motor synchronous speed is 2880 / min. The duration of the work quota: refers to the motor running. Insulation class: the level of motor insulation materials, decided to allow temperature rise of the motor. Standard number: said design motor technical documents basis. Excitation voltage: refers to the synchronous motor excitation voltage (V) when the rated work. Field current: refers to the synchronous motor excitation current (A) when 8500w gasoline generator the rated work.

Motor into the water after the maintenance method

Immediately after the motor by the water or water, need to check repair, remove the moisture, impurities, in order to prevent the permanent magnet generator motor damaged or destroyed. To fill the agricultural motor should be motor spare parts in accordance with the following four steps overhaul. 1, outside of the wholesalemotor.blogspot.com sludge, impurity removal motor, but do not turn the motor shaft. 2, open motor body, clean up the shell lumen, rotor, and the dirt and stains on the slip ring, check whether the winding is to take off the welding, brush whether rust stuck in the brush holder, brush pressure is normal, whether the brush and slip ring surface tiejin, if discover fault should be ruled out. 3, to dry the winding of the motor. Available incandescent lamp baking, make the moisture evaporation, also can be put in ventilated place dry naturally. But not with the current heat or open flame baking, in case of motor winding short circuit or bad insulation layer. After drying, need a megohmmeter or multimeter to check the coil insulation performance. Found to be defective insulation should be maintenance. 4, www.facebook.com/guohong.trading the motor body refitted, the test run of the motor. Such as test run without any problems, you can put to use.

Three-phase asynchronous motor control theory

The energy industry as the foundation of the national economy, for the development of society, economy and the improvement of people's living standard is very important. In the rapid growth of economic environment, China's energy industry faced with dual pressure of economic growth and environmental protection. With the development of computer technology, both in production and life, people's dependence on digital information degree is higher and higher. If the computer is the brain, is neural network, the three-phase asynchronous motor drive system is bones and muscles. The perfect combination between them is the development direction of modern industry. Closely integrated in order to make the ac speed regulation system and information system, at the same time in order to improve the performance of ac speed regulating system itself, must make ac speed regulation system to realize the full digital control. electric vehicle motor Single chip microcomputer has been widely used in the field of ac speed regulating system. For example in 1983 by Intel company development and production of MCS - 96 series is currently one of the high performance MCU series, suitable for high speed and high precision of industrial control. The high-grade type: 8 x 196 KB, 8, 8 x 196 x 196 kc MC, etc on the application of ac speed regulating system in general. The current global economic development, there are two significant interwoven lines: energy and the environment. Energy of tension is not only restricted the considerable economic growth in developing countries, also brought quite a big problem for many developed countries. Where energy concentration also tend to be the focus of the world's hot spots. 

And the development and utilization of energy and protecting the environment has a significant impact. Global warming, acid rain, and a series of environmental disasters are related to the development and utilization of energy. Due to the development theory of ac motor control, the control strategy and control algorithm are also increasingly complex. Extended kalman filtering, FFT, state observer and adaptive control, artificial neural network, and so on are applied to all kinds of ac motor vector control or direct torque control. Therefore, DSP chip in the high performance ac speed regulating system of full digital find skill stage. Such as TI company's MCS320F240 DSP chip, with its high cost performance has become a fully digital ac speed regulating system of choice. TI company recently launched MCS320F240X series products more price down to the level of SCM (single chip micyoco). In the process of fully digital ac speed regulation, various bus also has played a major role. STD bus, industrial PC bus, field bus and CAN bus in the field of automation application of Motor vehicle ac motor system played an important role. The data show that, under the influence of capital, technology, energy prices, China's energy efficiency is much lower than the developed countries. Energy-intensive products of China in the 90 s energy is generally higher than in developed countries 12% to 55%, more than 90% of the energy in the mining, processing and transformation, in the course of storage and transportation and terminal loss and waste. If the energy consumption per unit GNP (tons of standard coal/thousand dollars) country (mid - 90 - s), China respectively is Switzerland, Italy, Japan, France, Germany, Britain, the United States, Canada, 14.4 times, 11.3 times, 10.6 times, 8.8 times, 8.3 times, 7.2 times, 4.6 times and 4.2 times. In 1995, China's coal-fired power plant coal consumption of 412 grams of standard coal/kWh, 1.27 times that of the international advanced level. Therefore, the effective use of energy in our country is very urgent. As one of the large energy consumption of the motor in the aspect of energy saving is a potential can be dug. The total installed capacity of 400 million kilowatts of motor in China, 600 billion KWH, electricity consumption accounted for about 80% of the industrial electricity consumption. In all kinds of used motor, more than 80% for small and medium asynchronous motor under 0.55 220 kw. Overall equipment level in motor system in China is equivalent to the level of developed countries' 50 s. Therefore, 15 plans in the country, the motor system energy saving investment up to 50 billion yuan, so the variable frequency speed regulation system in our country will have a huge market demand. At present, the domestic research in variable frequency speed regulation system is very active, but also is not very ideal in terms of industrialization, most of the market is still dominated by foreign companies. Therefore, in order to accelerate the development of domestic Y series motor variable frequency speed regulation system, www.dongfeng-motor.com you need to the international development trend of variable frequency speed regulation technology and the domestic market demand have a comprehensive understanding.

Electrical engineer motor controller characteristics

Three-phase asynchronous motor has the extremely widespread application in the industry, according to statistics, in all of the country's electricity, the electricity used by motor occupies more than half of the three-phase asynchronous motor due to the operation is simple, high efficiency, became the most favored some companies and factories one of the most commonly used equipment. Along with the three-phase asynchronous motor, and the three-phase asynchronous motor controller. What motor vehicle spare parts are the characteristics of the three-phase asynchronous motor controller inside, (see electrical engineer) together with you now take a look. 1. Control running stable Controller, play a role, mainly is to control three phase asynchronous motor, so control running stable, which is the controller possessed the characteristics of a good. Also is such a characteristic, make controller are becoming widely used. 2. Reliable power supply system magnetic generator A three-phase asynchronous motor controller, if the power supply system is unreliable, then the controller is unable to normal work. Because want to ensure the normal order of the controller running, we must first ensure the power supply reliability. This is a controller with one of the important characteristics. 3. The intelligent system, the response is more flexible As the controller, using the above all is intelligent system. Can well connected to the three-phase asynchronous motor, so as to better control. Response is more flexible, but also can achieve the goal of the convenient control. Is discussed above has some characteristics of the three-phase asynchronous motor controller, may also is not very comprehensive, also it is because www.dongfeng-motor.com the controller has these characteristics, that three-phase asynchronous motor can be very good for work, also can facilitate people to control the motor, the controller can play its role.

Controlled operation of brushless dc motor electrical engineer

Brushless dc motor (BLDCM) is in a brush dc motor on the basis of development, but its drive current is a standard form of communication; Brushless dc motor and can be divided into rate of brushless motors and brushless torque motor. Generally, there are two kinds of brushless motor drive current, one kind is trapezoidal wave (usually "square"), the other is a sine wave. Sometimes called before a brushless dc motor, the latter is called ac servo motor,www.dongfeng-motor.com

exactly is a kind of ac servo motor. General electrical engineer brushless dc motor in order to reduce the moment of inertia, usually adopts the structure of "thin". Brushless dc motor on the weight and volume than a much smaller brush dc motor, the corresponding moment of inertia can be reduced by 40% - 50%. Because of the permanent magnetic material processing problems, the brushless dc motor general capacity are below 100 kw. That the mechanical properties of the motor and regulating characteristics of good linearity, wide speed range, long service life, convenient maintenance noise small, does not exist a series of problems caused by brush, so this kind of motor in the control system has great application potential. The stator winding of the motor to make more balanced three-phase y connection, with three phase asynchronous motor is very similar. On the rotor of the motor with the magnetization of the permanent magnet has, in order to detect the polarity of the motor rotor, inside the motor is equipped with position sensor. 

Drive consists of power electronic devices and integrated circuit, its function is: accept the motor start, stop, brake signal, to control the motor start, stop,www.facebook.com/guohong.trading
and the brake; Accept the position sensor signals and positive &negative, used to control the inverter bridge on and off of each power tube produce continuous torque; Accept the speed instruction and speed feedback signal, which is used to control and adjust the speed; To provide protection and display, and so on. Because of brushless dc motor based on self-control type operation, so don't like frequency control of motor speed synchronous motor overload start under plus startup winding on the rotor, also won't generate oscillation and step out when load mutation. Medium and small capacity of the permanent magnet brushless dc motor (BLDCM), now more than using high magnetic energy product of rare earth ndfeb material (Nd - Fe - B). As a result, the volume of rare earth permanent magnet brushless motor than three-phase asynchronous motor with capacity reduces a frame number. General electrical engineer pointed out that nearly 30 years study of asynchronous motor frequency control of motor speed, in the final analysis is looking for a way to control the asynchronous motor torque, rare earth permanent magnet brushless dc motor is bound to its wide speed range, small motor fan volume, high efficiency and steady speed water pump and small error characteristics appeared in the field of speed advantage. For brushless dc motor has the characteristics of a dc motor, is also the device of frequency variation, so also known as dc frequency conversion, the international general term for BLDC) motors running efficiency of the brushless dc motor, torque at low speed, precision of speed is more good than any of the control technology of inverter, so the industry concern. This product has production more than 55 kw, can design to 400 kw, can meet the requirements of industry energy saving and high performance drive.

The starting current of the motor 2

As is known to all, since the decoupling decompression starter the biggest advantage is starting torque is bigger, when the tap at 80%, starting torque can be up to 64% of direct starting. Set the starting torque of the motor is 1.4 times of its rated torque, in the reduced pressure, starting line current perkins diesel generator is 64% of the direct starting, starting torque is 90% of the rated torque. According to the survey, however, since the decoupling decompression starter mostly work in 65% tap place, but also a starting smoothly. According to the analysis, the starting torque of the motor at this time and for direct starting at 42%, compared motor vehicle spare parts with star triangle when starting a third, just big 8 ~ 9%. Can be expected, on this occasion the star delta starter also have not cannot, and indeed there are feed mill, water pumps and other USES star triangle decompression starter and functioning example. If consider the promotion of asynchronous motor with high starting torque, star triangle has wide foreground application more starting ways. Star delta starter can be implemented by way of manual operation and automatic control. Figure 1 is the star delta starter circuit automatically, which is to use a button and ac contactor to realize the automatic operation line, b is the use of time relay and ac contactor to realize the automatic operation line. Now after pressing a line to introduce the working principle of automatic star delta starter. Start, press the start button QA, contactor YC immediately action, its main contact to the stator windings into Y connection for starting: its auxiliary normally open contacts will contact QC coil circuit connected, make it, turn on the main circuit, the auxiliary normally closed contact is to cut off the contactor coil circuit of SC, lest by SC main contactor closing current short circuit accident. So it will be according to the motor, Y connection starting. Because of the time relay SJ in QA press after the electricity. So, after setting the time delay of the often open contacts, to cut off the YC coil circuit, make the YC release, SC, and motor run full pressure under the delta connection. At this point, the starting process is over, time relay coil circuit has been cut off by auxiliary normally closed contact of SC. QX3 series automatic star delta starter basic technical data listed in table 1. The starter set for overload protection of bimetal thermal relay and bimetal used www.facebook.com/guohong.trading as delay time relay, contactor is also used to connect and breaking circuit, so also has the protection of pressure loss. Since QX3 series automatic star delta starter is braking is used for motor control, natural its circuitry is consistent with the circuit shown in figure 1 b.

The starting current of the motor

Asynchronous motor starting problem is that it's a special problem in running. The commonly used methods are all direct starting, auto voltage reducing starting, Y - Δ starting, soft starting,

starting, etc. Automatic decompression star delta starter control circuit However, large starting

current, especially how much has the large capacity motor or electric motor needs to start at the

same time, www.dongfeng-motor.com great influence to power grid. For medium and small capacity of power grid, for example, large starting current will cause a big line pressure drop, and thus affect the power grid of the power supply quality auto voltage step-down start principle. Serious when, can even affect the normal operation of other electrical equipment in the power grid. It goes without saying that large starting current can result in considerable online road and the motor itself active power loss. Especially in the acceleration torque is small, load torque moment of inertia of the unit and larger, and starting and very frequent, this factor is more nots allow to ignore. Again, direct

starting is large starting torque, for the good of heavy load, but for the general light load, it is

possible to mechanical shock occurs, leading to drive belt torn, the gear was destroyed. So while

starting method is simple, direct starting equipment is simple, cheap, but in order to limit the

impact of the electrical and mechanical, and ensure the quality of the grid power supply, on some

occasions, decompression starting ways, or in series with wound rotor asynchronous motor rotor

circuit impedance for starting. Principle by a motor, the motor starting current is proportional to

the IQ in the terminal voltage of the motor, so reduce the terminal voltage, can make the starting

current is reduced proportionately. 

For example, when the motor down to its rating of 1 / k, will ac motor electric 65kw also reduce

the starting current to full voltage starting at 1 / k. So, seems to reduce the terminal voltage of

the motor is reduced when starting current impact, thus tz effective measures to solve the problem of

asynchronous motor starting, and voltage to reduce more to start the better. Actually it doesn't have to be. Because in the terminal voltage of the motor rated voltage reduce to 1 / k, although the

starting current is reduced to full voltage start 1 / k, but at the same time, the starting torque of

the motor is reduced, and it is according to the proportion of 1 / k2 greatly reduced, what's more,

starting when the power factor of drops will also aggravate the situation. asynchronous motor Therefore, must not simply think that reduce the voltage of the motor is a feasible way of starting anywhere. Star triangle starting in two aspects of power grid and load are allowed total pressure directly under the condition of starting, squirrel-cage asynchronous motor with direct starting advisable, convenient for operation control, and more economic. Autoformer decompression starter is often used to starting large capacity squirrel-cage asynchronous motor starting device for stress relief. Although autoformer decompression starter is an old-fashioned starting equipment, but using the autotransformer tapped the reduced pressure, can adapt to the needs of different load starting, and can get a bigger starting torque, and also due to furnish have thermal relay and low voltage trip and has a perfect protection of overload and voltage-absent, therefore, are still widely used. For the normal operation of the stator winding for delta connection squirrel-cage asynchronous motor, if at the time of starting the stator windings into star, waiting for start to end to connect into a

triangle, can reduce the starting current, to reduce its impact on the grid. Such starting way is

called star triangle decompression starting, or simply the star delta starter (Y - Δ starter).

The working principle of numerical control instrument lathe

Numerical control instrument lathe using fast clamping collet chuck, direct drive power electric motors spindle motor, the size of the disc quickly operating lever type, the vertical and horizontal to the positioning control turning, part of the instrument lathe with the installation of flange, tailstock, die with threading device, can processing and outer circle and inner circle, cutting, end face, cutting groove, tapering, drilling, reaming, tapping screw, milling, grinding, etc. Widely used in electrical electric motor cooling fan appliances, fasteners, automotive, motorcycle accessories, instruments and meters, hardware appliances, stationery, film and television equipment, mechanical and electrical products, plumbing pipe fittings, valves, bearing ring, axial and other small parts, glasses manufacturing production and processing, and other small workpiece is the most ideal high-efficiency equipment hardware machinery processing industry. Because use hand push feed, fast clamping collet chuck, plunger type limit device, a quick hand plate, motor direct drive spindle running, turning, positioning control of a single continuous processing fixed kinds of artifacts and appearance, and improve working efficiency 10 times more than ordinary lathe, especially suitable for large quantity, small parts processing. But instead of other machine tools, to save the energy.

Motor torque ripple

Electromagnetic torque ripple is due to the interaction between stator current and rotor magnetic

field and the torque ripple, it with the current waveform, the back emf waveform, the air gap

magnetic flux density electric fan motor parts is directly related to the distribution. Ideally, the stator current for the square wave, the back emf waveform as the trapezoidal wave, flat top width is 120 ° electrical point of view, the electromagnetic torque is constant value. Permanent magnet brushless perkins diesel generator dc motor due to its simple structure, high reliability, low speed high torque characteristics and has been more and more widely used, especially in recent years has been widely applied in the electric bicycle. Due to 4/7.5 Y132M - KW ac asynchronous motor bike is People's Daily transport, so people start the stability of the vehicle, such as noise www.facebook.com/dongfeng.motor indicators put forward higher requirements. Most of the existing electric motor using permanent magnet brushless dc motor, motor iron core of straight groove structure, winding for three-phase star connection, in two general inverter on state. Because of its high straight slot motor torque fluctuation at work, so we must optimize the motor structure and coordination with the optimized design of the controller can obtain satisfactory results. In this paper, how to design the ultra- quiet permanent magnet brushless dc motor controller for some discussions. The actual motor, the design and manufacture of reasons, may make the back emf waveform is not a trapezoidal wave, or wave crest width is 120 ° electrical point of view, this will cause the motor torque ripple.

In fact, it's not difficult to find such a MCU, such as the special motor control chip XC866 infineon, on-chip programmable control chip CY8C24533 with CYPRESS, etc. XC866 A/D conversion speed can reach 2 within us, plus program execution time, an A/D conversion to the total time within the eight of us, at that time interval complete enough to determine whether the current compensation. CY8C24533 CYPRESS is specifically designed for motor control development with high speed A/D chip, within its SAR8 conversion speed can reach 3 us,magnet generat orcombined with the automatic alignment trigger mode, A/D can be triggered at any time in the PWM current A/D sampling, it is also easy to realize the precise control of the current. Permanent magnet brushless motor with the electromagnetic factors, the influence of tooth, current commutation, the armature reaction will produce strong pulsating torque. In design Y180L - 4/22 kw three-phase asynchronous motor and the corresponding control system should be seriously considered, take measures to avoid excessive torque ripple. Due to the low speed high load running, the motor rotation of the electric potential is very small, in order to make the motor phase current shall not exceed the allowed maximum, PWM duty cycle is generally small, which makes the phase after the new phase winding current rising slowly. Adopting AOS (ten thousand) semiconductor production AOT460 MOSFET simulation. PSPICE software model of MOSFET using level3 level. In order to make the

commutation current rise rapidly, we can make the change after phase PWM duty ratio of 100% to

compensate for current, until the current up to the front of the commutation of current value, so

that we can make the change of phase current fluctuations in as little as possible, as far as

possible short time. As a result of the existence of groove teeth of the stator core, makes the

permanent magnet with the corresponding armature surface uneven air gap permeance, when the rotor rotates, made in a state of magnetic, magnetic circuit magnetic resistance change, that cause torque ripple. The cogging torque ripple caused by the rotor is magnetic fields interact to produce, has

nothing to do with the stator current. Thus restrained due to the cogging torque ripple mainly

focused on the optimization of motor design, such as chute.

Double speed three phase asynchronous motor winding classification

A single layer winding: Single-layer windings is each embedded in the stator slot only buy a coil winding, on the edge of effectively, so it only total coil motor half of the total number of slots. The advantages of the single layer winding is winding coil number less process is simple; Utilization of the interlayer not denied because trough increase; Single layer does not happen and breakdown failure, etc. Drawback is the winding of the electromagnetic wave shape is not ideal, motor iron loss and noise are large and starting performance also is a bit poor, so the single layer winding asynchronous motor only commonly used for small capacity. In accordance with the single layer winding coil shape and arranged termination local arrangement is different, can be divided into chain winding, cross chain, concentric windings and intersection concentric winding winding types, etc. www.facebook.com/dongfeng.motor 1 chain chain windings is by having the same shape and width of single coil components, due to its winding ends each coil like set up the link of the name. Should pay special attention to single chain winding of the coil pitch necessary for odd number, otherwise will not be able to arrange the winding arrangement. As per each phase 2 cross chain winding slot number nine is greater than 2 odd number will not be able to arrange the chain winding arrangement, at this time will need to use the intersection with single and double coil winding. Three concentric winding in the same group of extremely all coil around the same circle. When each phase slot number per level 4 Q is greater than 2 even can adopt the form of cross concentric winding. The advantages of ac synchronous motor single-layer concentric winding and cross concentric winding for winding, is relatively simple, embedding a long use wire end of faults is too much. Now except for useful in small capacity of 2, 4 pole motor, is now rarely use this winding form. 

Double cascading winding Single and double layer composite winding Star connection relationship with the Angle joint When the star of by change Angle: the original star connection wire diameter total cross-sectional area divided by 1.732 is equal to the Angle of the wire diameter total cross-sectional area. The Angle of by change star: when the original Angle joint line diameter when the total cross-sectional area multiplied by 1.732 is equal to the star connection wire diameter asynchronous motor of the total cross-sectional area. The difference of star connection with nature Angle joint When star connection line voltage equals 1.732 times the phase voltage, phase current is equal to the line current. Angle joint when the phase voltage is equal to the line voltage and line current is equal to the phase current of 1.732 times. With the power of the motor, when the star connection, wire diameter thick, less number of turns, the Angle joint, fine wire diameter, number of turns. When the Angle joint sectional area is 0.58 times of star connection. When the Angle joint line diameter when the total cross-sectional area divided by 0.58 is equal to the star connection wire diameter of the total cross-sectional area. When the star connection wire diameter total cross-sectional area multiplied by 0.58 is equal to the Angle of the wire diameter when total cross-sectional area) cross-section of wire diameter calculation formula: cross-sectional area S = square multiplied by 0.785 is the diameter of the motor internal connection with salient pole and ordinary pole, salient pole and ordinary pole is determined by the design properties of the motor can not be changed motor no-load current coefficient calculation

Three-phase asynchronous motor speed control application

Widely used three-phase asynchronous motor, but after running through a long time, can produce all kinds of fault, determine the cause of the problem in time, the corresponding processing, is to prevent failure, ensure the normal operation of equipment is an important work. A, after electrify motor does not turn, then fuse 1. The cause of the problem (1) the lack of a power supply, or set the main circle a contrary; (2) and stator winding short circuit; (3) of the stator winding grounding; (4) of the stator winding wiring error; (5) fuse section is too small; 5. The power cord short circuit or grounded. 2. The troubleshooting (1) to check whether there is a knife switches are not good, can be a phase break power supply circuit; Eliminate the reverse fault; (2) find out short circuit point, repair; 3. Eliminate grounding; (4) detected misconnection, be corrected; 5. Replace the fuse; (3) to eliminate ground point. Second, l. the cause of the problem (1) set, rotor winding circuit (a break) or loss of electric power supply a photograph; (2) winding lead beginning end wrong or winding inside the; (3) the power supply circuit of loose contact, contact resistance; (4) the motor load is too large or rotor stuck; (5) the power supply voltage is too low; 6. Small motor assembly is too tight or bearing grease is excellent; All landowners bearing stuck. 2. Troubleshooting (1) find out the breakpoint repair; (2) check the winding polarity; Judge winding ends is correct; (3) fastening screw loose connection, use the multimeter judge whether each joint false, repair; (4) the lightening or detect and eliminate the mechanical failure, (5) check also is the surface connection misconnection Y; Whether due to the large power supply wire carefully make the pressure drop, corrected, 6 reassemble makes it flexible; Replace the qualified grease; All landowners to fix the bearing. Four, after electrify motor cannot turn, but no ring, no peculiar smell and smoke 1. 

The cause of the problem (1) the power did not pass (at least two phase flux); (2) the blown fuse (at least two mutually fusing); (3) overcurrent relay adjusted too small; (4) control equipment connection errors. 2. The troubleshooting (1) check the power supply circuit switch, fuse, junction box, is there a breakpoint, repair; (2) check the fuse model, fusing the reason, a new fuse; (3) regulating relay setting value and motor coordination; (4) correct wiring. Third, the motor starting difficulty, rated load, motor speed is lower than the rated speed 1. The cause of the problem (1) the power supply voltage is too low; (2) the surface connection motor misconnection Y; (3) the cage rotor welding or fracture; (4) stator coil of local pick up, pick up the wrong; (3) increase the number of turns when repair motor winding too much; (5) motor overload. 2. The troubleshooting (1) to measure the power supply voltage, trying to improve; (2) the correct connection; (3) check the open welding and breakpoint and repair; (4) found it by accident, shall be corrected; (5) to restore the correct number of turns; 6. Lightening. After electrify motor does not turn a hum Five, motor racing, load, ammeter pointer instability, oscillation Article 1. The cause of the problem (1) the cage rotor guide open welding or broken; (2) wound rotor fault (a circuit) or poor contact brush, collector ring short circuit devices. Article 2. The troubleshooting (1) find out fault repair or replacement of the rotor; (2) check and repair wound rotor circuit. Six, motor no-load current imbalance, phase difference is big 1. The cause of the problem (1) the rewind, stator three phase winding circle number not equal; (2) the first end winding wrong; (3) the power supply voltage imbalance; (4) there winding interturn short circuit and coil reverse fault. 2. The troubleshooting (1) to make child winding around; (2) check and correct; (3) to measure the power supply voltage, trying to eliminate imbalance; (4) forms in addition to the winding faults. Seven, motor running noise is not normal, there are sound 1.

 The cause of the problem (1) the rotor and stator insulation paper or slot wedge facies; (2) oil bearing wear or with sand and other foreign body; (3) loose stator iron core; (4) bearing oil shortage; (5) to fill or brush wind hood fan, air duct and stator iron core facies; All landowners supply voltage is too high or not balance; End of the stator winding fault or short circuit. 2. The troubleshooting (1) clip insulation, low cutting slot wedge; (2) replace bearing or cleaning bearing; (3) maintenance and repair, motor parts the rotor iron core; (4) come on; 5. Clean up the air duct; Reinstall the place; 6. Remove the scratch, when necessary, the car small rotor; 7) check and adjust the power supply voltage; The stator windings faults was eliminated. Eight, the number of motor vibration in the operation of the larger 1. The cause of the problem (1) due to wear and tear bearing clearance is too large; (2) uneven air gap; (3) the rotor unbalance; (4) shaft bending; (5) core deformation or loose; 6. Coupling (pulley) center is not correct; All landowners fan imbalance; Today casing or base strength is not enough; Pet-name ruby motor loose bolts; Attending open cage rotor welding circuit; Wound rotor circuit; The stator winding fault. 2. The troubleshooting (1) repair the bearing, if necessary, to replace; (2) adjust the air gap, and make it evenly; (3) correction of rotor dynamic balance; (4) straightening shaft; Calibration overlapping iron core (5), 6 to correction, to comply with the rules; All landowners overhaul fan, balance correction, correct its geometry shape; Today to reinforce; Pet-name ruby fastening bolts; Attending to repair the rotor winding; The repair of the stator winding. Nine, motor no-load current balance, but value is big 1. The cause of the problem (1) to repair, the stator winding turns to reduce too much; (2) power supply voltage is too high; (3) Y after motor misconnection Δ; (4) in the motor assembly, rotor installed backwards, making the stator core unaligned, effective length cut short; (5) the air gap is too large or uneven; 6 overhaul when the demolition of the old winding, using hot tear open method is undeserved, make the iron core loss. 2. The troubleshooting (1) rewind stator winding, restore the correct number diesel generating set of turns; (2) managed to restore rated voltage; (3) to connect to Y; (4) to assembly; (3) to replace the new rotor or adjust the air gap; (5) maintenance core or recalculate winding, appropriately increase the number of turns.

Five kinds of three-phase asynchronous motor speed control method

A, method of frequency control of motor speed: Frequency control of motor speed is to change the

frequency of the motor stator power, to change its synchronous speed control method. Variable

frequency speed regulation system is the main equipment to provide frequency conversion power

inverter, frequency conversion motor can be divided into ac - dc - ac frequency converter and ac - ac

frequency converter two kinds big, cross - straight - to pay inverter are mostly used in China at

present. This method is suitable for the requirement of high precision, better speed control

performance. Its characteristics: 1, high efficiency and speed control in the process of no

additional loss; 2, wide application range, can be used in the cage type asynchronous motor; 3, large

range of speed regulation, and the characteristics of hard, high precision; 4, complex technology,

high cost, maintenance difficulties. Second, the change pole logarithmic speed control methods:

This control method is used to change the stator winding of red way to change the speed cage motor

stator polar logarithmic to achieve. This method is suitable for don't need a stepless speed

www.facebook.com/dongfeng.motor regulation of production machinery, such as metal cutting machine tools, elevators, lifting equipment, fan, water pump, etc. Characteristics are as follows: 1, with a hard mechanical properties, good stability; 2, no slip loss, high efficiency; 3, simple wiring and convenient control, low price; 4, have used differential is bigger, cannot obtain smooth speed regulation; 5, can be used with regulating speed control, electromagnetic slip clutch, smooth speed characteristics of high efficiency. Three, cascade speed regulation method: Cascade speed regulation refers to the motor rotor winding circuit in series with adjustable additional potential to change the slip of the motor, to achieve the purpose of speed control. Most of the slip power is absorbed by series of

additional potential to recycle produce additional device, the absorption of returning the slip power

grid or conversion of energy use. 

According to the slip power utilization way, cascade speed regulation can be divided into motor ac motor electric 65kwcascade speed regulation, mechanical cascade speed regulation and

thyristor cascade speed regulation form, adopts thyristor cascade speed regulation. This method is

suitable for the fan, water pump and the rolling mill, mine hoist, the extrusion machine use. Its

characteristics are: 1, but will slip loss in the process of speed feedback to the grid or production

machinery, high efficiency; 2, unit capacity is proportional to the speed range, saving investment,

apply to speed range in production machinery from 70% to 90% of the rated speed; 3, speed regulating device failure can switch to run at full speed, avoid production; 4, thyristor cascade speed

regulation low power factor, harmonic impact is bigger. Four, the stator voltage regulating speed

control methods: Change of motor stator voltage, be able to get a different set of mechanical

characteristic curve, in order to gain different speed. Due to the torque of the motor and the

voltage is proportional to square, thus maximum torque decreased a lot, the smaller range of speed

regulation, and makes difficult to apply general squirrel-cage motor.perkins diesel generator In order to enlarge the speed range, regulating speed rotor resistance value should be adopted for the big cage motor, such as torque motor, USES for regulating speed or frequency on the wound rotor motor series resistor. In order to expand the stable operation range, speed above 2:1 Settings when feedback

control should be adopted to achieve automatic adjustment speed. Regulating speed control is a main

device can provide voltage change of power supply, the current commonly used ways with saturable

reactor in series voltage regulator, autotransformer and thyristor voltage regulation. Thyristor

voltage regulation mode is the best. Regulating speed generally applicable to the production

machinery under 100 kw. Regulating speed control features: 1, the pressure regulating speed control

circuit is simple, easy to realize automatic control; 2, in the form of heat transfer differential

pressure regulating process power consumption in the rotor resistance and low efficiency. Five, the

wound rotor motor rotor series resistance speed control methods: Wound rotor asynchronous motor

rotor string into the additional resistance, make the slip of the motor, motor under low speed

running. The series resistance, the greater the lower the speed of the motor. This method is simple,

easy to control, but the slip power consumption in the form of heat on the resistance. Step speed,

mechanical properties of soft.

New technology of double speed motor

Because of the pump station drainage standard is low, and the drainage area and large variation range of water level, so often occurs in the pump station has been built for super lift was forced to stop. For this kind of pumping station renovation, such as simply to replace the existing high lift water pump water pump, although is can solve the problem of pumping station super head, but is likely to accompany a pump under low head gravely deviates from the high efficient www.facebook.com/dongfeng.motor area, causing new problems such as cavitation and vibration. Two-speed motor is new technology on the basis of the original water pump, by changing the line will be converted into motor with high and low two two-speed motor speed. Allows the unit to the there was a high lift pump station, corresponding to run at high speed, low in pump motor part station head, corresponding to the low speed running, which can run in the pump station super lift requirements under the premise of guarantee the magnet generator pump running in high efficient area for a long time. At present, the double-speed motor has got application in dongshen water supply project, at the same time by wuhan university of hydraulic and electric engineering of pump and pump station laboratory under the support of the department of the ministry of water resources, also have finished the old motor into two-speed motor research topic (the technology has been declared national patent), and using the new technology of double speed motor pump station created good conditions. Old motor modification two-speed motor method is to remove the old motor winding, and according to the original polar logarithmic nested new winding. When nested new winding, a new tap, derivation of new winding coil through the tap can be back together, so that the motor of the logarithm change, so that the motor has two logarithm, namely has the function of double speed.

Brushless dc motor electrical engineer

In electrical engineer brushless dc motor and dc motor has the same working principle and application characteristics, and its composition is not the same. In addition to the motor itself, the former is more than a commutation circuit, the motor itself and the reversing circuit together. Many small power motor of motor itself is integrated with commutation circuit, look from the appearance of brushless dc motor and the dc motor are exactly the same. Brushless dc motor of the machine itself is electromechanical energy conversion part, it besides motor armature, permanent magnet excitation two points, also with sensors. Motor itself is the core of the brushless dc motor, it is not only related to the performance index, noise, vibration, reliability and service life, etc., involving the manufacturing costs and product cost. Because use permanent magnet magnetic field, make the brushless dc motor from the traditional design and structure of the dc motor commonly, meet the requirements of various applications market, and development in the direction of the province copper material saving, simple and convenient manufacturing. Permanent magnet magnetic field is closely related to the application of permanent magnetic material, the development of the third generation of the application of permanent magnetic material, make brushless dc motor to efficiency, miniaturization, energy-saving direction. In order to achieve the electronic commutation must have a position signal to control the circuit. Early with the mechanical and electrical position sensor position signal, has been gradually use electronic position sensor or other ways to get position signal, the easiest way is to use the armature winding voltage signals as position. To realize the control of motor speed must have a speed signal. With similar position signal obtained speed signal, the simplest speed sensor is type tachogenerator frequency measurement combined with electronic circuits. Brushless dc motor reversing circuit consists of two parts, drive and control, it is not easy to separate the two parts, especially small power circuit integration between the two usually become single application-specific integrated circuit. In the power of the larger motor, drive circuit and control circuit can become one. Drive circuit output power, drive motor armature winding, and controlled by the control circuit. The driver circuit has from the water pump linear amplification state into PWM switch state, the corresponding circuit composition also from transistor discrete circuit into modular integrated circuit. Modular integrated circuit with power bipolar transistors, power field effect tube and isolation gate field effect in the form of a bipolar transistor, etc. Although, isolation bipolar transistor gate field effect the price is more expensive, but from the perspective of the safe and reliable performance 8500w gasoline generator with it is more appropriate.

Electrical Induction Iron Motors Frame

Compressor excessive current when the motor running, the cause analysis and elimination method

A, reason analysis Generally considered A refrigerator at work current value, more than normal working current 1.1 1.2 A, which is to think too much electricity. Here's why: 1, refrigerators and other high-power electrical equipment on the same power supply cord. 2, the power of the input voltage is too low, lower than allowed work voltage on duty, starting current is too large. 3, refrigeration systems affected by external factors, such as condenser clingy wall, there is too much dirt on tube, natural air flow effect is poor, the hot air send out not to go out; Or refrigerator near the heat source too, the refrigerator to store too much hot food, these factors will make the condensing pressure, cause the compressor start is difficult, the motor current is too large. 4, compressor internal assembly is not in conformity with the technical requirements, cause movement friction is too large, ac synchronous motor lead to electric reach rated speed, or even halt. Motor current is too large. 5, all of a sudden power failure, suddenly calls, time interval is short, high and low pressure in the system haven't balance, cause big start difficult, current is too large. 6, refrigerator system refrigerant leakage, temperature to drop, motor operation, cause too much electricity. 7, start relay failure, the thermal protector lost ability, cause too much electricity. Second, the elimination method 1, shall set up special diesel generators prices line power supply. 2, install the coupling voltage regulator, voltage regulator to the electrical ratings. 3, the refrigerator should be put in the place where the air circulation. 4, cut casing, reassemble the parts according to the technical standard. 5, when a sudden power failure found, shall be immediately disconnected refrigerator power head, when the power is www.dongfeng-motor.com on, then use the refrigerator. 6, by check, confirm the refrigerant in the system has been leaking, shall promptly repair and add freon. 7, start relay failure, should be timely repair or replacement.

Permanent magnet brushless motor is a little electrical engineer

As is known to all, the motor in our life are everywhere: from home appliances to the industry; Used cars to aviation, motor can be said to be the household appliance, apparatus, the core perkins diesel generator component of traffic construction machinery and industrial equipment. For a long time, high energy consumption, low efficiency, material consumption big asynchronous motor and excitation generator of traditional motor has been the main force that ACTS as a way of energy conversion. (see electrical engineer) pointed out that the permanent magnet brushless dc motor (BLDC) motors and permanent magnet brushless generator is in recent years, with the rapid development of electronic technology and a new type of motor. Brushless motor with a set of electronic commutation device to replace the mechanical brush motor reversing device, retained the has a broad and smooth brush ac motor electric 65kw dc motor performance of speed adjustment, at the same time there to overcome the mechanical commutator brush dc motor with a series of shortcomings, so is widely used in various fields, such as: computer floppy disk drive, the robot of artificial intelligence, CD machine, air conditioner, electric vehicles and aviation, spaceflight, shipping, etc. Except brushless motor brushless dc motor have advantages, also has the characteristic such as high energy density, high efficiency. At the same time, modern power electronic technology, the development of permanent magnetic materials and amorphous materials and provides convenient conditions for the development of brushless motor, drive the permanent magnet brushless motor in high performance, low power consumption, high power density, thus has a strong vitality and development prospects. Traditional industry cost pressure, the cost is not high www.facebook.com/guohong.trading but better performance of motor for technology promotion, increasing product competitiveness. For high-end permanent magnet brushless motor in the traditional industry overall upgrade carve out an innovative way.

The connection method of three phase asynchronous motor

Three-phase asynchronous motor in the process of production, a lot of details to our attention. Including the working process of the three-phase asynchronous motor wiring and step has received the attention, now online side have a lot of articles on this subject. Now let's detailed discuss the three-phase asynchronous motor in the process of line to use the right way. When we are in the connection of the three-phase ac asynchronous motor, the connection method is connected into a triangular or the decision of the star can't out of thin air and calm, must operate according to the provisions of the manufacturer, as to the rules, we can very clear on the motor nameplate. And Settings, at the end of the three stator windings are displayed in the factory when the factory set in advance, we are in the process of operation will not appear upside down at the end of the first operation. Three-phase asynchronous motor wiring, main is to consider three of the motor stator winding of each group has two thread derivation, the two leads to the thread end is called the head end, while the other end of the end of the call. In the process of wiring, three sets of components of six wiring head can connect the three-phase winding become the shape of a star or the shape of a triangle. But y connection is the main three wire winding at the end of the parallel. The triangle; Connection method is mainly the first end of the first phase in the three-phase winding is connected with the end of motor fan the third water pump phase, after the connection access a phase power; And then the second head end connected with the end of the first, and then connected to a phase power; Finally, will the rest of the head end of the end of the second and the third to connect, completes the connection after connected to a power supply operation.

Three-phase asynchronous motor speed control application

Widely used three-phase asynchronous motor, but after running through a long time, can produce all kinds of fault, determine the cause of the problem in time, the corresponding processing, is to prevent failure, ensure the normal operation of equipment is an important work. A, after electrify motor does not turn, then fuse 1. The cause of the problem (1) the lack of a power supply, or set the main circle a contrary; (2) and stator winding short circuit; (3) of the stator winding grounding; (4) of the stator winding wiring error; (5) fuse section is too small; 5. The power cord short circuit or grounded. 2. The troubleshooting (1) to check whether there is a knife switches are not good, can be a phase break power supply circuit; Eliminate the reverse fault; (2) find out short circuit point, repair; 3. Eliminate grounding; (4) detected misconnection, be corrected; 5. ac induction motor Replace the fuse; (3) to eliminate ground point. Second, l. the cause of the problem (1) set, rotor winding circuit (a break) or loss of electric power supply a photograph; (2) winding lead beginning end wrong or winding inside the; (3) the power supply circuit of loose contact, contact resistance; (4) the motor load is too large or rotor stuck; (5) the power supply voltage is too low; 6. Small motor assembly is too tight or bearing grease is excellent; All landowners bearing stuck. 2. Troubleshooting (1) find out the breakpoint repair; (2) check the winding polarity; Judge winding ends is correct; (3) fastening screw loose connection, use the multimeter judge www.facebook.com/dongfeng.motor whether each joint false, repair; (4) the lightening or detect and eliminate the mechanical failure, (5) check also is the surface connection misconnection Y; Whether due to the large power supply wire carefully make the pressure drop, corrected, 6 reassemble makes it flexible; Replace the qualified grease; All landowners to fix the bearing. Four, after electrify motor cannot turn, but no ring, no peculiar smell and smoke.

1. The cause of the problem (1) the power did not pass (at least two phase flux); (2) the blown fuse (at least two mutually fusing); (3) overcurrent relay adjusted too small; (4) control equipment connection errors. 2. The troubleshooting (1) check the power supply circuit switch, fuse, junction box, is there a breakpoint, repair; (2) check the fuse model, fusing the reason, a new fuse; (3) regulating relay setting value and motor coordination; (4) correct wiring. Third, the motor starting difficulty, rated load, motor speed is lower than the rated speed 1. The cause of the problem (1) the power supply voltage is too low; (2) the surface connection motor misconnection Y; (3) the cage rotor welding or fracture; (4) stator coil of local pick up, pick up the wrong; (3) increase the number of turns when repair motor winding too much; (5) motor overload. 2. The troubleshooting (1) to measure the power supply voltage, trying to improve; (2) the correct ac synchronous motor connection; (3) check the open welding and breakpoint and repair; (4) found it by accident, shall be corrected; (5) to restore the correct number of turns; 6. Lightening. After electrify motor does not turn a hum Five, motor racing, load, ammeter pointer instability, oscillation Article

1. The cause of the problem (1) the cage rotor guide open welding or broken; (2) wound rotor fault (a circuit) or poor contact brush, collector ring short circuit devices. Article 2. The troubleshooting (1) find out fault repair or replacement of the rotor; (2) check and repair wound rotor circuit. Six, motor no-load current imbalance, phase difference is big 1. The cause of the problem (1) the rewind, stator three phase winding circle number not equal; (2) the first end winding wrong; (3) the power supply voltage imbalance; (4) there winding interturn short circuit and coil reverse fault. 2. The troubleshooting (1) to make child winding around; (2) check and correct; (3) to measure the power supply voltage, trying to eliminate imbalance; (4) forms in addition to the winding faults. Seven, motor running noise is not normal, there are sound 1. The cause of the problem (1) the rotor and stator insulation paper or slot wedge facies; (2) oil bearing wear or with sand and other foreign body; (3) loose stator iron core; (4) bearing oil shortage; (5) to fill or brush wind hood fan, air duct and stator iron core facies; All landowners supply voltage is too high or not balance; End of the stator winding fault or short circuit. 2. The troubleshooting (1) clip insulation, low cutting slot wedge; (2) replace bearing or cleaning bearing; (3) maintenance and repair, the rotor iron core; (4) come on; 5. Clean up the air duct; Reinstall the place;

6. Remove the scratch, when necessary, the car small rotor; 7) check and adjust the power supply voltage; The stator windings faults was eliminated. Eight, the number of motor vibration in the operation of the larger 1. The cause of the problem (1) due to wear and tear bearing clearance is too large; (2) uneven air gap; (3) the rotor unbalance; (4) shaft bending; (5) core deformation or loose; 6. Coupling (pulley) center is not correct; All landowners fan imbalance; Today casing or base strength is not enough; Pet-name ruby motor loose bolts; Attending open cage rotor welding circuit; Wound rotor circuit; The stator winding fault. 2. The troubleshooting (1) repair the bearing, if necessary, to replace; (2) adjust the air gap, and make it evenly; (3) correction of rotor dynamic balance; (4) straightening shaft; Calibration overlapping iron core (5), 6 to correction, to comply with the rules; All landowners overhaul fan, balance correction, correct its geometry shape; Today to reinforce; Pet-name ruby fastening bolts; Attending to repair the rotor winding; The repair of the stator winding. Nine, motor no-load current balance, but value is big 1. The cause of the problem (1) to repair, the stator winding turns to reduce too much; (2) power supply voltage is too high; (3) Y after motor misconnection ; (4) in the motor assembly, rotor installed backwards, making the stator core unaligned, effective length cut short; (5) the air gap is too large or uneven; 6 overhaul when the demolition of the old winding, using hot tear open method is undeserved, make the iron core loss. 2. The troubleshooting (1) rewind stator winding, restore the correct number of turns; (2) managed to restore rated voltage; (3) to connect to Y; (4) to assembly; (3) to replace the new rotor or adjust the air gap; (5) maintenance core or recalculate winding, appropriately increase the number of turns.