DSP based torque and speed controls of the permanent magnet hysteresis synchronous motor

This paper presents the detailed derivation of the permanent magnet hysteresis synchronous motor (PMHS) torque equation and the design of the digital speed controller for the DSP based PMHS motor vector control system. The torque control that regulates the speed of the PMHS motor, is provided by a quadrature axis current command developed by the speed controller. The digital speed controller design is carried out by the symmetry optimum condition based on the speed loop transfer function. Experimental results of the PMHS control using DS1102 DSP board are presented. The speed of the PMHS motor is successfully controlled from 1 Hz to 60 Hz for the first time. Experimental results show that the hybrid PMHS motor exhibits improved speed stability especially in very low speed range