A study of cogging torque reduction methods in brushless DC motor

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Publication Details

Author list: Srisiriwanna T., Konghirun M.

Publisher: Hindawi

Publication year: 2012

ISBN: 9781467320245

ISSN: 0146-9428

eISSN: 1745-4557

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84866759795&doi=10.1109%2fECTICon.2012.6254191&partnerID=40&md5=d5b0c2a83096a6c4945072f843c159e2

Languages: English-Great Britain (EN-GB)

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Abstract

The cogging torque is undesirable effect in the brushless dc (BLDC) motor, causing vibration and audible noises.It arises from the rotor permanent magnet interacting with the steel teeth on the stator. Therefore, this paper studies the various reduction methods of cogging torque when designing a BLDC motor. These methods can be categorized according to three parts of motor structure, i.e., air gap length, rotor and stator parts. The finite element method magnetic (FEMM) is primarily used to analyze the cogging torque among these different reduction methods. In this paper, a 4-pole, 24-slot BLDC motor is focused with variations of air gap length, rotor, and stator parts in order to study its cogging torque reductions. Finally, the FEMM simulation results are presented to validate these reduction methods. ฉ 2012 IEEE.

Keywords

Brushless dc motor, Cogging torque, Finite-element method magnetic