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Performance Evaluation of a U-Shaped Less-Rare-Earth Hybrid Permanent Magnet Assisted Synchronous Reluctance Motor

In order to solve the rare-earth crisis emerged in recent years, a new permanent magnet assisted synchronous reluctance motor with less rare-earth materials is proposed in this paper. The novelty of the motor is the less rare-earth PMs and more ferrite PMs are artfully inset in its rotor with U shapes. Furthermore, an improved rotor structure with sectorial flux barriers is designed for less magnetic flux leakage. By using finite-element analysis method, the electromagnetic performances are evaluated, including flux density distribution, back-EMF and harmonic frequency analysis. In particular, the torque production characteristics are investigated in details. Finally, the analysis results indicate that the proposed motor can offer a desirable torque capability with relatively less rare earth materials.