Abstract
A new hybrid magnetic source field modulation machine (HMS-FMM) is proposed in this paper, which can work in a wide speed range and guarantee high quality torque output. Due to the bidirectional flux modulation effect applied in HMS-FMM, a large number of working harmonics can be used to generate torque. Direct current excitation is employed to regulate airgap flux density at stator yoke for wide speed range and low harmonic distortion rate at flux weakening state. In order to improve the air gap flux density, the auxiliary tooth is introduced to connect ferrite and stator tooth for providing parallel magnetic circuit. The proposed topology, operating principle and key design parameters are described. Then, the electromagnetic performances are analyzed using finite element analysis (FEA) including magnetic field distribution, back electromotive force, torque characteristics and irreversible demagnetization assessment for magnets. The FEA-predicted results show that the proposed HMS-FMM is an appealing choice for electric vehicle application, which has the merit of high torque production with low torque ripple and safe operation without demagnetization risk in wide operation range.
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