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.