Analysis of cogging torque caused by manufacturing tolerances of surfacemounted permanent magnet synchronous motor for electric power steering

Ji Min Kim, Myung Hwan Yoon, Jung Pyo Hong, Sung Il Kim

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

The reduction of cogging torque is the most important design objective for electric power steering (EPS) motors, because the rotation characteristics of the motor are directly transmitted to a driver. Therefore, a variety of optimal design methods are applied to reduce the cogging torque for EPS motors. However, the measured cogging torques of fabricated models are significantly greater than the finite-element analysis (FEA) results, because the additional harmonic components (AHCs) of the cogging torque are generated by manufacturing tolerances. The cogging torque generated by manufacturing tolerances can be divided into two components, which are generated by stator and rotor tolerances. In this study, AHCs, which cause cogging torque, are analysed by FEA by applying various tolerances to the analysis model, and harmonic analysis is also conducted. The relation of AHC generated from the stator and rotor is analysed by a rotor swapping test. Consequently, this study can be helpful to analyse the components of the cogging torque generated by manufacturing processes.

Original languageEnglish
Pages (from-to)691-696
Number of pages6
JournalIET Electric Power Applications
Volume10
Issue number8
DOIs
StatePublished - 2016 Sep 1

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