Three-dimensional angle eccentric permanent magnet synchronous motor electromagnetic force wave calculation method based on magnetic conductance correction

By using a three-dimensional angular eccentricity calculation method based on magnetic permeability correction, the problem of electromagnetic force wave variation caused by angular eccentricity in permanent magnet synchronous motors is solved, achieving efficient motor performance testing and stability assurance.

CN120870858APending Publication Date: 2025-10-31ZHEJIANG UNIV OF TECH
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Patent Information

Application Number
CN202510805919.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-17
Publication Date
2025-10-31

AI Technical Summary

Technical Problem

Existing technologies cannot effectively address the axial static and dynamic angular eccentricity of permanent magnet synchronous motors caused by manufacturing and assembly errors and load deformation, which leads to changes in electromagnetic force waves and affects motor performance and stability.

Method used

A method for calculating electromagnetic force waves of a three-dimensional angularly eccentric permanent magnet synchronous motor based on magnetic permeability correction is adopted. By introducing an axial eccentricity correction coefficient, the electromagnetic force waves under the inner rotor angular eccentricity state are characterized as a function of the axial coordinate, which simplifies the mathematical calculation of electromagnetic force waves.

Benefits of technology

It reduces the complexity of electromagnetic force wave calculations, improves calculation efficiency, can accurately detect and solve motor shaft misalignment problems, ensures stable motor operation, extends service life, and reduces operating costs.

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Abstract

The invention discloses a three-dimensional angle eccentric permanent magnet synchronous motor electromagnetic force wave calculation method based on magnetic conductance correction, and the method comprises the following steps: obtaining the parameter information of a motor in a normal state, calculating the air gap flux density of the permanent magnet synchronous motor under a load through the parameter information of the motor, and obtaining the radial flux density and the tangential flux density; a magnetic conductance correction coefficient under static eccentricity is introduced, and radial flux density and tangential air gap flux density after eccentricity are obtained through calculation; calculating radial force waves and tangential force waves acting on the surfaces of the stator and the rotor during eccentricity according to the flux density after eccentricity; and introducing a magnetic conductance correction coefficient under inclined eccentricity to obtain a three-dimensional electromagnetic force wave which changes along with a space axial position under angular eccentricity of the inner rotor of the permanent magnet synchronous motor. According to the method, by introducing the axial eccentricity correction coefficient, the electromagnetic force wave of the permanent magnet synchronous motor in the angular eccentricity state of the inner rotor is represented as a function about the axial coordinate, and the technical problem that a traditional two-dimensional eccentricity model cannot process axial angular eccentricity is effectively solved.
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