Comparative Analysis of Positive and Negative Salient IPMSM Drive Performance

This paper presents a comparative analysis of the positive and negative saliency effects of IPMSM. IPMSM drives are widely used in EV applications due to their robust construction and extra reluctance torque production as compared to the surface permanent magnet synchronous motor. Negative salient IPMSM has $L_{d}$ is greater than the $L_{q}$ which can achieve wide speed control. Therefore, it is broadly suggested for electrical vehicle Purposes. The FOC (field oriented control) method is mostly preferred speed control technique of IPMSM in the industry because the motor can control like a separately excited DC motor. MTPA of the IPMSM drive is preferred to reduce the copper loss by selecting the proper operating point. Flux weakening control algorithm used to achieve speed above rated speed. When Positive saliency IPMSM operating below the base speed $I_{d}$ current is demagnetizing whereas in Negative saliency $I_{d}$ current is flux-intensifying current. Negative salient PMSM has a wide constant power region. Due to reverse saliency, the operating machine operating points are also reversed during MTPA operation. MATLAB Simulation demonstrates that negative saliency IPMSM has additional advantageous points over the positive salient IPMSM