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This paper presents the magnetic equivalent circuit of a permanent magnet hysteresis synchronous motor (PMHS). The hybrid synchronous motor consists of 36% cobalt steel hysteresis alloys with neodymium iron boron permanent magnets to improve the overall performances of such a motor. Based on the magnetic equivalent circuit, the control strategy of the PMHS motor is developed. Experimental results confirm the validity of the proposed magnetic equivalent circuit model and show that the hybrid motor exhibits improved speed stability over a wide range.
Date of Publication: Sept. 2003