Topology Optimization to Reduce Electromagnetic Force Induced Vibration for the Specific Frequency of PMSM Motor Using Electromagnetic-Structural Coupled Analysis

Gyeong Uk Jang,Seunghyeon Cho,Kyunghun Jeon,Jaemin Moon,Chang-Wan Kim

doi:10.3390/en14020431

Abstract

Vibration and noise reduction are very important in electric vehicle driving motors. In this study, topology optimization of housing was performed to reduce vibration in a specific frequency caused by electromagnetic force generated by a permanent magnet synchronous motor (PMSM). The vibration induced by the electromagnetic force of the motor was calculated using electromagnetic-structural coupled analysis. Then, the magnitude of the acceleration for a specific frequency at which peak occurs in the rectangular and circular shape housing concept design model was reduced by using the topology optimization method. As a result, the rectangular and circular shape housing design reduced 92.9% and 96.0%, respectively. Finally, the vibration was effectively reduced while maintaining the electromagnetic characteristics of the motor, for which topology optimization was conducted while not changing the rotor or stator shape design (electromagnetic design factor) but by changing the motor housing shape design (mechanical and structural design factor).

Highlights

IntroductionAs the applications of electric vehicles are becoming increasingly widespread, the demand for high-output electric motors used for driving such vehicles is increasing
As the applications of electric vehicles are becoming increasingly widespread, the demand for high-output electric motors used for driving such vehicles is increasing.In this regard, the permanent magnet synchronous motor (PMSM) is widely used for driving electric vehicles due to its high torque output and high efficiency [1]
The vibrational source in PMSMs is stated as a bigger problem in the stator structure vibration characteristics by electromagnetic forces than electromagnetic vibration characteristics such as cogging torque and torque ripple [3]

Summary

Introduction

As the applications of electric vehicles are becoming increasingly widespread, the demand for high-output electric motors used for driving such vehicles is increasing In this regard, the permanent magnet synchronous motor (PMSM) is widely used for driving electric vehicles due to its high torque output and high efficiency [1]. The structural vibrations of the PMSM is induced by the electromagnetic force acting in the radial direction, which is excited by the stator [4]. Since this force exhibits electromagnetic characteristics and induces structural vibrations of the motor, an electromagnetic-structure coupling analysis method that simultaneously considers electromagnetic and structural aspects should be used to understand the vibration characteristics of the motor

Methods

Findings

Discussion

Conclusion