This paper presents a digital sliding-mode based current regulator for the suppression of the undesirable circulating currents in a dual 3-phase IPMSM drive. Due to their high frequency variation in synchronous reference frame and non-linear inductance variation, the suppression of the circulating currents is a challenging task. Following the principles of digital sliding-mode control, the proposed controller is capable of effectively suppressing the circulating currents. The performance evaluation of the proposed controller is performed in two modes, viz, equivalent control law based and equivalent control law with disturbance compensation.
