Squirrel-cage asynchronous motor soft starter application - soft starter way of starting

 Y series totally enclosed protect Asynchronous 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

1 current-limiting starting: in the process of starting, limit the starting current does not exceed a certain value (Im), and then keep the output current, I < Im increased under the condition of voltage, until the rated voltage; The motor speed gradually increases, until the rated speed. Slope voltage starting 2: electric motor 12v 500w in electric vehicle motor the process of starting, the output torque of the motor with the increase of voltage, when starting to provide an initial starting voltage Us, then the output voltage from the Us started to grow in a certain slope, slope adjustable), motor accelerating. When the output voltage reaches up to Ur speed voltage, the motor is basically reach the rated speed. When the motor reaches the rated speed, make the output voltage at rated voltage. 3 starting torque control: use in overloading starting torque control, it is the starting torque of the motor from small to large linear rise.


Stator Motors Rotor 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 

3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

 It has the advantage of smooth starting, flexibility is good, have better protection to drag system, its purpose is to protect the drag system, extend the service life of the drag system. 4 starting torque and kick control: at the beginning of the start stage, let the thyristor within a very short time conduction after all fall, according to the original set the value of the linear rise again, enter the starting with constant current. Starting torque and kick control and torque control starting similar is also used in overloading starting, the difference is with acmotortrading.blogspot.com a sudden jump in starting torque to overcome static torque of the motor, then smooth torque rise, shorten the start-up time. Starting: 5 voltage control the voltage control starting is used for light load starting of occasions, in guarantee starting pressure drop the maximum starting torque motor, as much as possible to shorten the start-up time, is the optimal way of light load soft starter.

Frequency conversion air conditioning inverter IPM protection

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

 IPM module itself has the dc flow and the overheating protection signal output, its principle as shown in figure 13. IPM module is internal protection circuit AC synchronous generator and internal constitute a loop under the arm, power supply using lower arm E trigger drive power. Protection signal transmission to the CPU, so should pass light lotus root IC9 isolation and Q1, driven by the www.dongfeng-motor.com plug CN1 terminals (1) the output to the motherboard. Protection process analysis is as follows: under the normal state, IPM triode internal protection for by the state, the light lotus root IC9 in globe, transistor Q1 in micro conduction fan motor state, the output voltage is + 4.3 V. Due to the PN voltage is too high, compressor stalling or other reasons, such as the IPM output current is too large, and the heat dissipation, continuous and overheat lamination the IPM, such as work time is too long, IPM internal protection triode by globe into conduction, light lotus root IC9 in conduction, transistor Q1 base for low voltage, Q1 closing, the emitter output low voltage protection signals.

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.

Squirrel-cage asynchronous motor soft starter application - soft starter way of starting

 Stator Motors Rotor 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 
3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD


1 current-limiting starting: in the process of starting, limit the starting current does not exceed a certain value (Im), and then keep the output current, I < Im increased under the condition of voltage, until the rated voltage; The motor speed gradually increases, until the rated speed. Slope voltage starting 2: electric motor 12v 500w in electric vehicle motor the process of starting, the output torque of the motor with the increase of voltage, when starting to provide an initial starting voltage Us, then the output voltage from the Us started to grow in a certain slope, slope adjustable), motor accelerating. When the output voltage reaches up to Ur speed voltage, the motor is basically reach the rated speed. When the motor reaches the rated speed, make the output voltage at rated voltage. 3 starting torque control: use in overloading starting torque control, it is the starting torque of the motor from small to large linear rise. 


Y2 series electric motor wholesale

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

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

It has the advantage of smooth starting, flexibility is good, have better protection to drag system, its purpose is to protect the drag system, extend the service life of the drag system. 4 starting torque and kick control: at the beginning of the start stage, let the thyristor within a very short time conduction after all fall, according to the original set the value of the linear rise again, enter the starting with constant current. Starting torque and kick control and torque control starting similar is also used in overloading starting, the difference is with acmotortrading.blogspot.com a sudden jump in starting torque to overcome static torque of the motor, then smooth torque rise, shorten the start-up time. Starting: 5 voltage control the voltage control starting is used for light load starting of occasions, in guarantee starting pressure drop the maximum starting torque motor, as much as possible to shorten the start-up time, is the optimal way of light load soft starter.

Sensorless brushless dc motor control - inductive method

  electric motor 20hp aluminum body 
Specifications
1. 20 years manufacturing experience
2. competitive price,high quality
3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

 Inductive method has two forms: one kind is used for salient pole permanent magnet brushless dc motor, another kind is used in the embedded magnetic steel structure of the permanent magnet brushless dc motor. The first inductive method mainly through applying detection in the process of starting the www.facebook.com/guohong.trading motor winding voltage to judge its inductance changes, it is used in "the potential laws" a starting technology. Because in a salient pole machine, winding, the self inductance L said into the axis of the winding and the rotor can be direct axis Angle between H times cosine function, by detecting the change electric motor fan cover of L, can determine the approximate location of the rotor axis, and then based on the change trend of iron core saturation degree determine its polarity, thus eventually get correct position signal. This method for implementation is difficult, and can only be applied to the salient pole machine, so the application is less now. 


Y series totally enclosed protect Asynchronous 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

Compared with the first, the second form is the true sense of the inductive method. In an embedded type permanent magnet brushless dc motor, the winding inductance would occur because of the change of rotor position and corresponding change, by detecting the change, after a certain calculation again, can get the rotor position signal. When y connection of the three-phase winding inductance changes, including point potential V n will change. Assume in figure 3 a + T, T, b - conduction, when So, lamination detection of L b = L a moment, can detect the ec passing zero moment. This method put forward by foreign first, and on the air conditioning compressor control application, speed range might reach 500 ~ 7, 500 r/min. This method of detection precision, error is small, but the difficulty is bigger also, it needs to continuously the real-time detection of the winding inductance.

The analysis of the causes of transformer oil leakage

Stator Motors Rotor
Specifications
1. 20 years manufacturing experience

2. competitive price,high quality

1,the seal quality reasons:At the scene of the collapse of the transformer terminals can be found at a time,leakage of oil terminal blocks most of fastening nut loose,install this doesn't mean that it did not tighten,with plane flange rubber gasket,for the first time after fastening tend to loose because of plastic deformation of ac induction motor the rubber gasket,need a second fastening.Transformer and our factory has been running for many years,there is no rubber gasket deformation problem,may explain why only is rubber gasket ageing lose elasticity,reducing the pressure on the surface of the flange connection.According to my years of generator generator set experience in maintenance,air isolation rubber gasket to run more than ten years should not have what problem.


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

Such as the transformer operation of our factory in nanjing,cichang has more than 20 years,did not find for porcelain set gasket aging oil leakage.Presumably liling porcelain production of transformer set gasket exist quality problems.2,environmental temperature change electricalmotor1.blogspot.com reasons:Refer to instruction for use of current transformer,transformer running environment temperature 40 ℃,the highest temperature is + minimum temperature of 40 ℃.Our factory area this summer outdoor certainly higher than 40 motor vehicle ℃,the highest temperature field measurement of the surface temperature is close to 50 ℃.After each part of the summer heat equipment thermal expansion,due to environment temperature drop after high temperature season,but all kinds of material shrinkage is not consistent with the temperature,cause the leakage of oil from the surface.This point in our plant is particularly prominent.

From abnormal vibration of asynchronous motor and how to determine the cause of the problem in his voice?

 electric motor 20hp aluminum body
Specifications
1.AC motor aluminum body
2.customized
3. 20 years manufacturing experience
4. competitive price,high quality

Asynchronous motor produce abnormal vibration and abnormal sound mainly has two aspects of mechanical and electromagnetic. Mechanical reasons: (1), motor blades damage or tighten screw loose blades, blades and the blades into cover, clattering sound produced by it with the weight of the sound, the big small; (2), due to the improper bearing wear or shaft, motor rotor eccentricity caused serious when will make, rotor rub, make the motor produces severe vibration and electric fan motor uneven scratches. (3), motor due to long-term use of the anchor bolt is loose or not foundation, thus the electromagnetic torque of the motor under the action of abnormal vibration; (4), long-term use of the electric motor 12v 500w motor due to a lack of lubricating oil in the bearing inner formed in mill run or bearing steel ball is damaged, therefore make the hiss of the motor bearing interior an exception or purr. Electromagnetic reasons: (1), the normal operation of the motor suddenly appear abnormal sound, in the load running speed decreases significantly, while a low along the roar, may be unbalanced three phase current, the heavy load or single phase operation.


Y series totally enclosed protect Asynchronous motor

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

4. high starting torque

(2), the normal operation of the motor, if the stator and rotor winding short-circuit fault ac induction motor 110kw or squirrel cage rotor broken bar when electric are high when low buzz. The fuselage vibration. (1), due to long-term lack of oil running of motor bearing, friction losses increase bearing overheating. In addition, when the motor running, the oil too much or too thick will also cause bearing overheating; (2), when the replacement of lubrication, due to the lubricating oil mixed with hard grain impurity or bearing cleaning uneven net, make bearing wear and overheating, even may damage the bearing; (3), due to improper assembly, fixed end cover wholesalemotor.blogspot.com screw tightness is differ, in a straight line between the two bearing center is unbalanced or bearing outer ring. The bearing rotation is not flexible, adds load after growing friction and heat; (4), belt too tight or motor and were not in a straight line with mechanical shaft center, and thus can increase the bearing load and heat; (5), bearing improper selection or poor quality, such as bearing internal and external ring rust, individual steel ball is not round, etc.; 6, in the operation of the motor bearing damaged, resulting in bearing overheating.