Brushless dc servo motor characteristics

Y2 series high power China ac motor

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration 
Moment of inertia of small, low starting voltage and no-load current; Contact the reversing system, generator greatly improve the motor speed, maximum speed up to 100 RPM, 100; Brushless servo control in the implementation of the acmotor2.blogspot.com servo motor, squirrel cage induction motor without encoder also can realize single phase induction motor the control of speed, position, torque, etc; ac motors three phase induction motor generator There is 3 phase induction motor no brush wear condition, in addition to high speed, also has a long service life, low noise, diesel generator set no electromagnetic ac motors interference, etc.

The inverter no-load current is greater than the load current

 115/120 V AC Voltage and Three-phase Phase small 240v electric motor
Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 
5.Protection class: IP54 
A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon Cause: a cement plant users to send a 75 kw can WIN - G9 frequency converter, the cause of the problem is, in the operation of the fire smoke in the inverter, the inverter downtime. Check, the power input circuit of the machine for three phase half controlled bridge, using the principle of controlled rectifier, on the main loop of the dc energy storage capacitor "soft power" and save the small power inverter commonly used rechargeable contactor. In fact half controlled bridge in this here is equivalent to non-contact soft blunt electricity switch. Inspection found that one of the thyristor module electrical motor 12v 1000w terminals have obvious signs of flashover arc burning, but the measurement is not short circuit. Found in the disassembly easily fixed nut landed, flashover reason seems to be a connecting screw loose, causing poor contact. The module for a combination of a diode and a one-way thyristor. And then check the control panel and inverter main circuit, without exception. The module, more than two phase half controlled bridge as the ac electric motor power input, after power on, with a small power 2.2 kW three-phase motor, feel no problem, switch to the new module after a same model, then to the site for installation.

DONGFENG Brand Two Speed Motor
Specifications
1. DONGFENG Brand Two Speed Motor 
2. 3000RPM-750RPM 
3. Electrical motor 
4. factory price best quality 

5. 100% copper 
 Precaution, first will run to 5 hz frequency, frequency converter load as a fan, motor connector off first, make the motor no-load running. This trial run, got a fright! Frequency at 5 hz, no-load running current 45 a, although feel slightly larger, but consider for a possible repair, or frequency converter for motor winding parameters such as starting curve or torque compensation made adjustment caused by waiting for a reason, without notice. When up to 10 hz inverter panel shows the current and the output current is measured with clip-on table, have reached the 100 a! And the oscillation amplitude of the output current is great, but test the three-phase output voltage, about 70 v, balanced and stable. The motor cable release, electric logging on the inverter output, output frequency 10 hz, the output voltage is 70 v, 20 hz to 150 v, 35 hz to 250 v, after decreasing with frequency, to 50 hz, 400 v. In this process, the measurement of three-phase output voltage balance is very good. The inverter output of V/F curve electricalmotor1.blogspot.com accords with quadratic load torque characteristics. No problem. Output voltage balance and stability, and the output current is too large and the current volatility, obviously for the load caused by abnormal. This is lead to the conclusion of conventional judgment.

The use of the insulation resistance meter megohm meter method

motor Lamination ac motor blender parts 

Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance 
Megohmmeter at work, its produce high voltage, the measured object is electrical equipment, so must be used correctly, otherwise it will cause personal and equipment accident. Before use, first of all, to do well the following preparation: (1) the measurement device under test must be before the power cut off, and the short circuit discharge, never promised to electric measuring equipment, to ensure the www.dongfeng-motor.com safety of person and equipment. (2) the possible induction of high voltage equipment, must eliminate this possibility, can be measured. Analyte (3) to clean surface, reduce the contact resistance, ensure the accuracy of measurement results. (4) to check whether megohmmeter before measuring the normal working state, the main check the "0" and "up" two points. The rocking handle, make the motor to achieve rated speed, when short 3 phase induction motor circuit by megger refers to the "0" position, should be to point to in the "up" position when open. (5) when used by Induction motor megger should be in a stable, strong place, permanent magnet motor and away from the big current conductor and external magnetic field.

Phase four trapezoidal wave type

 AC induction cooling fan motor 
Specifications
1. Customised 
2. good quality 
3. 20 years manufacturing experience 
4. Altitude: ≤1000m

Because of P - I controller gain and frequency response is limited, so the instability of the current loop control is easy to cause the current phase lag and control error. The higher the speed, the bigger the error. This also to the stability of the direction of the stator current vector not to follow the rotation of electric motor the rotor magnetic field and deviation in vertical direction effectively. This makes the motor output torque smaller, so we need more current to keep the motor torque. It is said the motor efficiency decreased. The higher the motor speed, this situation is worse. In some moods, the direction of single phase motor price motor current offset will reach more than 90 degrees, when the motor torque will be reduced to zero. In the case of using wave type commutation, if speed is higher than the state, electricity output negative moment, but it is impossible to happen. 


Y series best cast iron three phase induction motor

Specifications
1. 20 years manufacturing experience 
2. 12 months guarantee 
3. low noise and temperature rise 
4. high starting torque 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

Wave type control mode with the nature of the problems, it is the current of motor control is a control variable. When the motor speed continuously improve, P - I controller reaches the limit bandwidth, this control mode will lose its effect. Vector control can solve this problem, it is directly controlled by corresponding to the rotor magnetic field parallel and perpendicular to the direction vector current component to achieve precise control of the stator coil current. Theoretically, the vector current can be decomposed into two parallel and perpendicular to the rotor magnetic field small diesel generator current component. Because the current in the two directions is static, so P - I controller to control the current of can is dc, rather than string wave signal. So the coil current and voltage of the controller output is a constant, not the original variables changing with time, it also eliminates the controller on the frequency response and phase drift limits. If using vector control method to control the brushless motor, the quality of the current control and motor www.dongfeng- motor.com speed has nothing to do.

IRMCF341 application on frequency conversion electrical appliances

 IRMCF341 application on frequency conversion electrical appliances, mainly aim at high functionality and save electricity. For example, requires higher than that of high speed, good control performance and www.facebook.com/dongfeng.motor small size light weight, large capacity, high comfort, long life, safe and reliable, mute, save electricity, etc. 341 is mainly used in permanent magnet synchronous motor, ac permanent magnet synchronous motor is a kind of can directly start up in the 50 hz three-phase alternating current environment of electric motor, its operation mode is: start asynchronous, synchronous operation. 

Ac permanent magnet synchronous generator set spare parts motor is rare earth permanent magnet materials to replace traditional electrical excitation and made of high efficiency and energy saving motor, it not only has general and permanent magnet motor has simple structure, reliable operation, the advantages of small fever, but also has small volume, light weight, low loss and high efficiency of marked characteristics, can realize the traditional electro-magnetic motor is 3 phase induction motor difficult to achieve high performance. Plus 341 based on FOC () field oriented vector frequency conversion control, sine wave driving mode for 180 degrees, more make it fully play at the same time, the performance of 341 USES electric resistance current sampling refactoring techniques, save the cost and single resistance current sampling reconstruction technology refers to the current 341 use current PWM corresponding state, use appropriate delay time (avoid current oscillation) can collect the real bus current, will to many times current restructuring in the PWM timing can be three phase current.

Electric learning dribs and drabs

The choice of cable specification:low pressure parts,we are usually calculated according to current loop,again on this foundation to set aside 35% of the allowance (that is,computing current divided by 0.65),according to the results single phase induction motor compared with the current carrying capacity of the cable select cable; High pressure parts,wholesalemotor.blogspot.com it is in the loop on the basis of the calculation of cable set aside 20% of allowance,which is divided by 0.8 Electrical single phase asynchronous motor five prevention:1 to prevent false points,or circuit breaker.2 to prevent loading and isolating switch.3 prevent charged hang (us) ground wire (switch).4 with a ground wire (switch) circuit breaker (isolating switch).5 prevent straying into charged interval.The low voltage side of transformer is electric motors price quick break according to escape (maximum short-circuit current) three-phase short-circuit current setting.

The present situation of the stepper motor electrical engineer

Step motor has become the third class except dc motor and ac motor motor. Traditional motor as an electromechanical energy conversion device, in the human production and life into play a key role in the process of electrification. But in today's human society into the era of automation, the function of the traditional motor can not meet all sorts of motion control system such as factory automation and office automation. To meet these requirements, development of a series of new motor system has the control function, which has its own characteristics, are widely used and category is stepping motor. General electrical engineer is pointed out that the development of stepper motor is closely related to the computer industry. Since the stepper motor in the computer peripheral equipment to replace later, small dc motor to improve the performance of the equipment, quickly promoted the development of the stepper motor. On the other hand, the development of the microcomputer and digital control technology, and will perform component as the numerical control system of step motor applied to other areas, such as electric machine, small power mechanical processing machine tools, electric motor cooling fan measuring instruments, optical and medical equipment, packaging machinery, etc. Mature process, any kind of products are basically specifications varieties gradually unify and simplify the process. 

Now, the development of the stepper motor has come down to the reluctance of single conductor structure type, the structure of the hybrid and claw pole permanent magnet three categories. Cheap, the claw pole motor performance index is not high, the hybrid and magnetic resistance type main motor as high resolution, because the hybrid stepping motor has small control power, good running stability and gradually in a dominant position. The most typical product is two phase 8 50 gear motor, step away from the Angle of 1.8 ° / 0.9 ° steps (full/half); And five phase 10 pole 50 tooth and some rotor 100 teeth of two and five phase motor fan stepper motor, five phase motor is mainly used in the occasion of high performance. So far, the industry developed countries very rare magnetic resistance type stepping motor. Stepper motor of the biggest producers were Japan, such as Japanese servo company, Oriental, SANYODENKI and MINEBEA and NPM company etc., especially east company in Japan, whether the motor performance and appearance quality, or the means of production, all is the best in the world. Now Japanese stepper motor output (including foreign owned company) nearly 200 million units. Another conclusion is type HB stepping motor is more suitable for low speed high torque purposes; The RM type is suitable for the smooth running and speed greater than 1000 r/min purpose; And at the time of the low speed PM type of low cost, vibration and high speed, large torque of three-phase type PM stepping motor is better than the performance of the two phase motor.