Equivalent circuit modeling of an interior permanent magnet hysteresis motor

An interior permanent magnet hysteresis (IPMHS) motor is a solid-rotor self-starting synchronous motor. Its rotor has a solid hysteresis ring made of composite materials of high degree of magnetic hysteresis with buried permanent magnets inside the ring. In this paper, the nonlinear behavior of the rotor hysteresis material is modeled using the elliptical approximation of the hysteresis loop. Magnetic and electrical equivalent circuits of an IPMHS motor have been developed considering the d-q axis saliency of the rotor. A set of state variable equations have been presented and simulated to obtain the steady state and dynamic run-up responses of a 2.5 kW 3-phase, 4-pole line start IPMHS motor. Simulation results are presented and analyzed in this paper.