The Transactions of the Korean Institute of Electrical Engineers B (대한전기학회논문지:전기기기및에너지변환시스템부문B)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

A Study on the Reduction of Cogging Torque of Outer-Rotor Type BLDC Motor for Washing Machines

세탁기용 외전형 BLDC 전동기의 코깅 토오크 저감에 관한 연구

  • 김재민 (중앙대학 전자전기공학부) ;
  • 장철혁 (중앙대학 전자전기공학부) ;
  • 정태경 (중앙대학 전자전기공학부)
  • Published : 2005.05.01
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Abstract

This paper deals with the reduction of cogging torque of a outer-rotor type BLDC motor mainly used for washing machines. The motor comprises permanent magnet outer-rotor and stator with coils and core. This structure inherently produces vibration and cogging torque because of uneven reluctance according to rotation of the rotor. Up to now, adopted a type of 24 magnet pole and 36 slot-stator. This generates high main torque but accompanies comparatively large cogging torque. This paper proposes a 32-pole 36-slot type motor which reduces cogging torque remarkably. The influence of cogging torque is varied according to pole-slot combinations. The characteristic of the motor was obtained by a two-dimensional finite element method coupled with a drive circuit. The performance of the proposed model is superior to that of the existing model because of the reduction of torque ripple and the improvement of back ernf wave form.

Keywords

References

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