Field-circuit coupling analysis method for radial electromagnetic vibration of motor

Abstract

The invention discloses a field-circuit coupling analysis method for radial electromagnetic vibration of a motor. The method comprises the steps of a) performing calculation by utilizing a closed slotfinite element model of the motor to obtain an air-gap magnetic field of a permanent magnet; b) according to a characteristic of synchronous rotation of harmonics in the magnetic field of the permanent magnet, performing analysis; c) according to the arrangement of a motor winding, performing harmonic analysis on armature reaction magnetomotive force; d) performing FFT analysis for a magnetic field model obtained by magnetic permeance of each harmonic, and in combination with a time harmonic number and a rotation direction in the magnetomotive force, obtaining a space number, a rotation direction, an initial phase and a magnetic field amplitude value of the magnetic field of each harmonic; e) performing vector synthesis on the magnetic fields of all the harmonics obtained by analysis in the steps a)-d); f) transmitting a radial force wave acting on the surface of a stator to a yoke part through a modulation effect of stator teeth to generate vibration; and g) performing scanning analysis on a stator mode by adopting a frequency sweeping method to obtain a resonant frequency of each low order. According to the method, the locating of a source of the radial electromagnetic vibrationof the motor is more accurate; and the vibration characteristic can be quickly assessed.

Description

technical field [0001] The invention relates to a method for analyzing the radial electromagnetic vibration field-path coupling of a motor. Background technique [0002] High power density, high torque density motors have very broad application prospects in new energy vehicles, military equipment, automated production lines, advanced production and other applications. In order to achieve high power density and high torque density design requirements, on the one hand, it is required to enhance the magnetic field strength in the air gap of the motor to improve the utilization rate of electromagnetic materials; on the other hand, it is required to reduce the effective materials of the motor to reduce the weight of the motor. These two factors will have a greater impact on the electromagnetic radial vibration of the motor. The increase of the air gap magnetic field strength makes the amplitude of the radial standing wave of the motor increase significantly, and the weight reduc...

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Problems solved by technology

Using structural analysis software, the force wave acts as an excitation on the surface of the stator to obtain the deformation of the motor stator. Although this method can obtain the deformation spectrum, it cannot effectively obtain the vibration time domain spectrum

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