Digital Current Control Method of Induction Motor Using Synchronous Current Detection with PWM Signal

This paper proposes a fully digital current control method with DSP for the vector control of the induction motor.First, we present a new dead time compensation circuit, whch makes the delay time between the PWM signal and the actual output voltage constant. Therefore, the synchronous current sampling with the PWM signal can detect the accurate fundamental frequency component from the ripply current.Moreover, we discuss the current regulator which improves the response of the primary current and compensates the parameters deviation of the motor. And, we show that this control system is possible to get the quick response and the low current ripple in spite of the slow sampling rate by the experimental results.