A microcomputer-based induction motor drive system using current and torque control

This paper proposes an induction motor drive with current and torque control. The current control based on the current error with the current controller yields h/sub l/ signal. The torque control based on the torque error with the torque controller yields a h/sub l/ signal. According to the h/sub l/ signal, the h/sub l/ signal and the appropriate voltage vector is selected by using a look-up table to control the induction motor drive to obtain a rapid speed response. The torque controller, current controller, and d-q frame transform are constructed by the hardware which reduce the running time of the microcomputer to obtain a high performance drive. Computer simulations and experimental results demonstrate that the proposed method can obtain a high performance induction motor drive. Meanwhile, employing the advantages of the added zero voltage vector to reduce the inverter switching frequency greatly increasing the efficiency of the inverter.