Abstract
This paper takes an interior permanent magnet synchronous motor (IPMSM) of electric vehicle as the research object. Firstly, the flux density of the air gap, the electromagnetic force wave on the stator surface and the torque ripple of this motor are analysed from the perspective of electromagnetic field. Secondly, the modal analysis is carried out from the aspect of the structure of the motor, and the electromagnetic noise of the IPMSM under no-load condition and load conditions is studied from the above two aspects. Combined with the electromagnetic simulation software, the order, frequency and amplitude of the electromagnetic force wave under no-load condition and load conditions are calculated accurately. The modal frequencies and structural vibration of the stator are obtained by finite element simulation. To achieve the ultimate effect of reducing electromagnetic noise, the electromagnetic noise is optimized by slotting the outer circle of the rotor. The research provides a way to optimize the electromagnetic noise of the interior permanent magnet synchronous motor (IPMSM) for electric vehicles.
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