Analytical modeling of a hysteresis interior permanent magnet motor

A hysteresis interior permanent magnet (IPM) motor is a solid-rotor self-starting synchronous motor. Its rotor has a hysteresis ring made of composite material with high degree of hysteresis energy per unit volume. The Neodymium Boron Iron (Nd-B-Fe) magnets are buried inside the hysteresis ring. This paper presents the analytical modeling of a line start hysteresis IPM motor to investigate its starting and synchronization capability for different loading conditions. In this paper, d-q axis equivalent circuit models of a line start hysteresis IPM motor have been developed based on the elliptical approximation of the hysteresis loop. Simulations have been carried out to obtain the run-up responses of a 3-phase 4-pole 208 V, 3.4 HP line start hysteresis IPM motor. Simulation results are presented and analyzed in this paper. Simulation results exhibit that the proposed motor has good self-starting and synchronization capabilities.