The high performance control strategy is implemented in
closed loop using PID controller. The total control scheme of
the drive system is shown in Fig. 1. The components of
current im
* and it
* are used to generate the three phase
reference currents ia
*, ib
*, and ic
*. These reference currents are
then compared with the actual motor currents ia, ib, and ic to
generate PWM switching signals, which will turn on or turn
off the power semiconductor devices of the three phase
inverter to produce the actual voltages to the motor.