Improved analytical model of motor stator core vibration induced by magnetostriction

Abstract

The invention discloses an improved analytical model of motor stator core vibration induced by magnetostriction. According to the characteristics of a structure and magnetic field distribution of a radial flux motor, a stator core is divided into two subdomains: a yoke and a tooth; the vibration of the yoke is the vibration of a torus and the vibration of the tooth is the vibration of a rectangular block; based on a piezomagnetic equation and the Newton's law, vibration partial differential equations of the yoke and the tooth of the stator core along the radial and axial directions are established; and a vibration differential equation is solved by adopting a method of separation of variables, and undetermined coefficients are solved according to a boundary condition. The improved analytical model of the motor stator core vibration induced by the magnetostriction provided by the invention is accurate in calculation result and clear in physical conception, can be applied to calculating the vibration displacement, velocity and acceleration of the motor stator core induced by the magnetostriction, the stress and strain distribution characteristics, and is an effective method for motor vibration analysis.

Description

technical field [0001] The invention belongs to the technical field of electromagnetism vibration analysis of electric machines, and in particular relates to an improved analytical model of vibration of a stator iron core of an electric machine caused by magnetostriction. Background technique [0002] The main vibration and noise sources of the motor are: electromagnetic vibration noise source, mechanical vibration noise source and aerodynamic vibration noise source. Electromagnetic vibration noise is further divided into vibration noise caused by electromagnetic force and vibration noise caused by magnetostriction. In the existing research results, many scholars ignore the magnetostrictive effect, and focus on the electromagnetic vibration noise caused by electromagnetic force. However, in recent years, with the continuous development of experimental testing technology, the gradual deepening of refined research on engineering application issues, and the continuous improvem...

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Problems solved by technology

Although the finite element method has high solution accuracy, it takes up too much computer resources, takes a long time to calculate, and the calculation results are easily affected by factors such as grid division.

At present, there is only one public document that uses the analytical method to study the electromagnetic vibration of the motor caused by magnetostriction, but this analytical calculation model only considers the two-dimensional in-plane vibration of the stator core of the motor, and does not consider the axial vibration of the core

At the same time, this method only considers the stress along the tangential direction of the stator core yoke ring, ignoring the radial and axial stresses. This simplified model can only calculate the average vibration of the motor yoke ring, and cannot Calculate the distribution characteristics of vibration displacement, stress and strain in the yoke of the stator core of the motor

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