Trapezoidal wave commutation six

 Two way P - I controller output signal characterization of the voltage vector corresponding to the rotor. Corresponds to the motor current signal conversion, these static also after a series of reference voltage vector coordinate transformation, need the voltage control signal output bridge road. They first by rotor dynamic d - q reference structure is transformed into static x-y structure of stator. Then the voltage signal is again by the rectangular coordinate structure into the physical structure of the spacing between 120 degrees, then input to the motor of the U, V and W phase coil. This three-way voltage signal in the input generator set spare parts to the motor coil should be based on the PWM modulation. 

Of the time-varying motor coil current and the voltage wave signal is converted into d - q structure of dc signal's job is to reference coordinate transformation. Wave type change between the phase and the vector control is the essential difference between a series of coordinate transformation and handling of the current control. In string wave 3 phase induction motor type commutation mode, we need to change phase, then the string wave is obtained by wholesalemotor.blogspot.com P - I control electric current. So to control the system of P - I mainly deal with time-varying motor current and voltage wave signal, the performance of the motor is controller bandwidth and the phase drift limit. In vector control, current signal after P - I control first, then through high-speed phase of processing. Therefore, P - I controller does not need to deal with time-varying current and voltage signal; System is not subject to P - I bandwidth and the influence of the phase shifting controller.