A Method for Reducing Torque Ripple of Continuous Pole Permanent Magnet Synchronous Motor

Abstract

The invention discloses a method for reducing the torque ripple of a continuous pole permanent magnet synchronous motor, which specifically includes: first, starting from the principle of torque ripple generation, determining the harmonic order of the rotor magnetomotive force that affects the torque ripple; Then, according to the proportional relationship between the rotor air-gap flux density and the rotor magnetomotive force, the harmonic order of the rotor air-gap flux density that affects the torque ripple is determined; The derivation of the Fourier expression of the pole arc coefficient and the pole arc coefficient of the unequal continuous pole permanent magnet, and then deduce the effect of the angle difference of the pole arc coefficient of the unequal continuous pole permanent magnet to weaken the main harmonic order of the specific torque ripple Furthermore, the peak-to-valley cancellation between the torque ripples generated by the unequal-pole arc coefficients is used to reduce the 1st main harmonic of the torque ripple, so as to achieve the purpose of reducing the overall torque ripple. Therefore, it has both high permanent magnet utilization and low torque ripple while ensuring that the average value of the motor output torque is almost unchanged.

Description

technical field [0001] The invention relates to the design of a continuous pole permanent magnet synchronous motor, in particular to a method for reducing the torque ripple of the continuous pole permanent magnet synchronous motor, and belongs to the technical field of motor manufacturing. Background technique [0002] Nowadays, permanent magnet synchronous motors have been widely used, and they play a very important role in many fields from automobiles to aerospace. This is mainly due to several salient features of permanent magnet synchronous motors, including high torque density, high efficiency, and small weight and volume. The permanent magnet synchronous motor uses a magnetic material with a high magnetic energy product to replace the traditional excitation winding, which not only eliminates the negative impact of the excitation winding, but also simplifies the mechanical structure of the motor, which improves the reliability of the motor and reduces the mechanical los...

AI Technical Summary

Problems solved by technology

On this basis, it is far from enough to analyze the cogging torque of the permanent magnet synchronous motor with discontinuous poles

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