Analytical Model of Consequent-Pole Flux Reversal Machine With Segmented Magnet Arrangement

Abstract

A 2-D analytical subdomain model is proposed for a consequent-pole flux reversal (CPFR) permanent magnet (PM) machine with novel segmented magnet arrangement. Three-segment magnets with different arc-lengths and different magnetization angles are inset in one stator tooth. For the open-circuit and armature-reaction magnetic fields, according to the governing equations for all divided regions and the boundary condition equations between adjacent subdomains, the complex matrices are constructed and the field distribution can be solved separately. Based on this, the induced electromotive force and electromagnetic torque can be predicted. In addition, the arc-length and the magnetization angle for each magnet segment are optimized. Taking six-slot/14-pole CPFR motors as examples, the optimization results show that the proposed model has better electromagnetic performance than the conventional ones. A prototype motor is manufactured, and the experiments validate the analytical and finite element analysis (FEA) predictions.