A novel flux-weakening strategy study to improve performance of IPMSM drives

This paper proposes a new flux-weakening control strategy for Interior Permanent Magnet Synchronous Motor (IPMSM) drives. The difference of reference voltage vector action time using over-modulation technique in SVPWM is used to modify d-axis current to realize the flux-weakening control strategy. Automatic transition between the constant torque region and the constant power region can be achieved smoothly owing to the proposed method. Compared with the conventional flux-weakening algorithm, the designed algorithm can improve the torque output capability in constant power area effectively due to the expansion of the utilization rate of the DC-link voltage.