Finite-element/boundary-element transient modelling of hysteresis motors

This paper presents a transient study of hysteresis motor based on the proposed hybrid method of finite element method- boundary element method (FEM-BEM) in which the Jiles-Atherton (J-A) vector hysteresis model of the hard-magnetic material of the rotor is incorporated. The air-gap region is modeled by BEM in order to avoid the discontinuity in the FEM equations due to J-A hysteresis model and the rotor movement and, therefore, the eddy current effect is taken into account in the rotor part, for the first time. To the best of the author's knowledge, the prior time-dependent numerical models have ignored the torque component caused by eddy currents in the rotor of hysteresis motor, due to difficulty in rotating the mesh in the rotor region and the related convergence problems. The proposed model is employed to study the phenomenon of short period over-excitation in hysteresis motors. A comparison is done between the proposed time-domain model and the frequency-domain finite element model of the hysteresis motor.

Automated summary

This paper introduces a new hybrid method of finite element method-boundary element method for transient analysis of hysteresis motor, which considers the eddy current effect in the rotor region for the first time, addressing issues in traditional models. The study demonstrates that the proposed model outperforms traditional models in analyzing the phenomenon of over-excitation in hysteresis motors.