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| Sinusoidal Optimization Model for Air Gap Magnetic Field of Eccentric Magnetic Pole Permanent Magnet Motor |
| Hu Pengfei, Wang Dong, Jin Shuanbao, Wei Yingsan, Lin Nan |
| National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan 430033 China |
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Abstract Smaller air gap magnetic field radial electromagnetic force harmonics and lower torque ripple can be obtained by optimizing the air gap magnetic field and making the radial air gap magnetic density waveform close to sinusoidal. Consequently, the overall performance of the motor is optimized. In this paper, the carter coefficient Kδ is used to correct the effective air gap length of the motor affected by the opening of the stator slot, and the influence of the actual permanent magnet relative permeability on the air gap magnetic density is considered. In addition, the air gap flux density function, the magnetization direction thickness function of the permanent magnet and the stator rotor magnetism, and the potential calculation equation are combined. Consequently, the radial air gap magnetic density calculation formula are derived under the load condition of the arc eccentric magnetic pole parallel magnetization. The radial air gap magnetic density THD (Total Harmonic Distortion) is then obtained. With the variation curve of eccentricity and polar arc coefficient, the eccentricity and polar arc coefficient which minimize the radial air gap magnetic density THD can be obtained. The analytical model has been verified by finite element method and prototype test. This analytical model takes into account various factors affecting the radial sinusoidal sine and amplitude of the radial air gap, and does not need to radially segment the permanent magnet to consider the influence of the surface eccentricity of the permanent magnet pole on the air gap magnetic field. Compared with the sub-domain method, it is simple and time-saving, while maintaining high calculation accuracy, which provides a reference for the optimization design of surface-mount permanent magnet motor.
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Received: 29 June 2018
Published: 26 September 2019
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2019, Vol. 34 
