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

The Korean Institute of Electrical Engineers (대한전기학회)
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Electromagnetic Force Analysis of BLDC Motor for Hard Disk Drive

하드디스크 구동용 BLDC 전동기의 전자력 해석에 관한 연구

  • 박승찬 (한양대 공학기술연구소) ;
  • 윤태호 (한양대 대학원 전기공학과) ;
  • 권병일 (한양대 공대 전기공학과) ;
  • 윤희수 (삼성전자(주) 종합연구소) ;
  • 원성홍 (삼성전자(주) 종합연구소)
  • Published : 1999.09.01
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Abstract

In this paper, electromagnetic forces acting on the rotor surface of a BLDC motor for hard disk drive are calculated by the finite element field analysis. The frequency characteristics of torque ripple, local force and unbalanced magnetic force as a source of mechanical vibration area analyzed. Ring-type permanent magnets for the brushless DC motor are apt to have different magnetization levels at each pole because of the unbalanced air gap between the magnet surface and the magnetizer fixture during the multi-poles magnetizing process. This paper discusses the effect of the unsymmetric magnetization distribution in the permanent magnet on the brushless DC motor performances. As a result, the unbalanced magnetic force acting on the rotor surface and the torque ripple are examined for the motor with an unsymmetric magnetization distribution, and compared with those of an ideally symmetric motor.

Keywords

References

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