基于形貌优化法的无轴承开关磁阻电机减振降噪

Vibration and Noise Reduction of Bearingless Switched Reluctance Motor Based on Shape Optimization Method

脉振的径向电磁力作为激励源作用于12/8极单绕组宽转子齿无轴承开关磁阻电机(Bearingless switched reluctance motor with wider rotor teeth,BSRMWR)的定子齿面并传送至定子轭部及机壳,会引发较大的振动噪声,阻碍其推广应用。针对这一问题,本文从本体结构的角度入手对电机壳体进行优化改进。采用三维多物理场有限元模型,建立了BSRMWR电磁⁃结构⁃振动⁃声场耦合模型。通过对BSRMWR电磁场进行瞬态分析,得到径向电磁力。将模态应变能方法应用于BSRMWR的壳体得到电机外壳结构有较大的应变能,说明电机壳体结构的薄弱。基于此,通过形貌优化的方法对电机的壳体结构进行优化。结果表明,采用形貌优化后机壳结构的BSRMWR,其振动和噪声均有显著改善。

The radial electromagnetic force of the pulse vibration acts as an excitation source on the stator tooth surface of a 12/8-pole single-winding bearingless switched reluctance motor wider with rotor tooth(BSRMWR)and transmits it to the stator yoke and the stator yoke,which causes a large vibration and noise and hinders its popularization and application.In view of this problem,this paper optimizes and improves the motor housing from the perspective of the body structure.Using the three-dimensional multiphysics finite element model,the electromagnetic-structure-vibration-sound field coupling model of BSRMWR is established.The radial electromagnetic force is obtained by transient analysis of the BSRMWR electromagnetic field.The modal strain energy method is applied to the shell of BSRMWR,and the motor shell structure has a large strain energy,which shows that the motor shell structure is weak.Based on this,the casing structure of the motor is optimized by the method of morphology optimization.The results show that the vibration and noise of the BSRMWR with the chassis structure optimized by the topography are significantly improved.