Study of A PMSM Model Incorporating Structural and Saturation Saliencies

Sensorless permanent magnet synchronous motor (PMSM) drive systems have become very attractive due to their advantages, such as reduction of hardware complexity and hence the system cost and increment of system reliability. In order to correctly obtain the rotor position information required for the appropriate control, various methods have been proposed. Among them, the most versatile method makes use of the structural and magnetic saturation saliencies of the PMSM. This paper presents a non-linear model of PMSMs considering the saliencies. The phase inductances of a PMSM are measured and expressed in Fourier series versus stator winding currents and rotor positions according to the inductance pattern. The simulated dynamic performance is compared with that based on a model without considering saliency to verify the effectiveness of the proposed PMSM model