Method for reducing vibration and noise of permanent-magnet motor

Abstract

The invention discloses a method for reducing the vibration and the noise of a permanent-magnet motor, comprising the following steps of: (1) initially selecting a magnetic pole number and a tooth socket number according to application occasions; (2) judging the stress and vibration states of the permanent-magnet motor, wherein the permanent-magnet motor generates torque pulsation if a phase tuning factor ks=0 is solved according to a formula: ks=mod (lsNs / Nm) and km=0 is solved according to a formula: km=mod (lsNm / Ns), the permanent-magnet motor generates unbalanced magnetic pull if the phase tuning factor ks=1 or Nm-1 and km=1 or Ns-1, and the permanent-magnet motor is in a stress balance state if ks=2, 3, 4 to Nm-2 and km=2, 3, 4 to Ns-2; and (3) repeating calculation formulas of the corresponding stress and vibration states in the step (2) to select the sum of the magnetic pole number and the tooth socket number. The method can be used for selecting different parameters aiming at different occasions according to the mapping relation between the magnetic pole number and the tooth socket number of the permanent-magnet motor and the vibration and noise characteristics of the permanent-magnet motor, thereby realizing the vibration reduction and / or the noise reduction of the permanent-magnet motor.

Description

technical field [0001] The invention relates to a method for reducing vibration and noise, in particular to a method for reducing vibration and noise of a permanent magnet motor. Background technique [0002] Permanent magnet motor is a kind of electromechanical energy conversion device with magnetic field as the medium. It has the advantages of energy saving, environmental protection, simple structure and reliable operation. It has a wide range of applications. But in many important applications, vibration and noise levels have become important indicators of motor performance. [0003] Due to the pulsating excitation of the permanent magnet motor, it will inevitably generate vibration and noise, thus affecting the performance of the motor. For example, in digital copying equipment, the torque ripple of the motor will cause electrostatic latent images on the surface of the photoreceptor, thus affecting the copying quality. In high-speed disk drives, the vibration of the sp...

AI Technical Summary

Problems solved by technology

[0020] The disadvantages of the above methods are: the unit number optimization method does not give a correct and complete slot / pole / phase number matching principle; the unit shape optimization method does not establish a general priority criterion for the magnetic pole shape; the unit position optimization method lacks an optimal section The general principle of the included angle between the poles, the non-uniform distribution angle of the magnetic poles, and the inclination angle of the slot / pole; while the optimal control method basically does not consider the influence of mechanical factors

[0025] (1) There are still contradictions in some conclusions in the existing literature, which need further clarification

[0026] (2) The existing literature on the vibration characteristics of permanent magnet motors is limited to single-frequency excitation

But in fact there are two kinds of frequency excitation force, so the previous research can not accurately reveal the relationship between parameters and vibration characteristics

[0027] (3) The existing parameter selection principle is essentially the principle of mutual prime, which does not fully consider the influence of parameter matching on dynamic characteristics

In fact, this principle does not significantly reduce vibration and noise, and even increases vibration in a certain direction, while generating significant noise

Therefore, it is a technical bias to select parameters based on this principle in order to achieve vibration and noise reduction

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