Mode Current Control and Cancelling in dq Reference Frame for Permanent-Magnet Synchronous Motors with Double Independent Three-Phase Windings

Abstract

This paper proposes a new current control method for permanent-magnet synchronous motors with double independent three-phase windings (DIW-PMSMs). This method employs two role-sharing current controllers, namely “fast-mode current controller” and “slow-mode current canceller”, both of which are realized in the dq synchronous reference frame. The fast-mode current controller is a kind of feedback controllers; however it is designed through the use of the leakage inductance rather than the inductance of DIW-PMSMs. On the other hand, the slow-mode current canceller is designed through the use of the mutual inductance of double independent three-phase windings. The effectiveness and usefulness of the proposed method are verified though tough simulations in which the test motor has small leakage coefficients (i.e. large coupling coefficients), the motor parameters and current commands associated with each winding are widely different, and the motor speed is very high.