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

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

  1. National convention record of IEEJ Silent drive for brushless DC motor R.Kawamoto;S.Yamamoto;H.Azuma;T.Mori
  2. T.IEE of Japan v.116-D no.12 Current Control Method for Zero Torque Ripple and Maximum Efficinecy of Brushless DC Motor T. Chigiri;T.Shimada;T.Watanabe;O.Ichinokura;T.Jinzenji
  3. 전력전자학회 논문지 v.3 no.3 BLDC 전동기용 센서리스 드라이브의 토크 리플 저감을 위한 전환방법에 관한 연구 여형기;김태형;박정배;이광운;유지윤
  4. COMPEL v.9 no.5 Pole Shape Optimization for Reduction of Cogging Torque by Sensitivity Analysis I.H.Park;B.T.Lee;S.Y. Hahn
  5. IEEE Trans. on Magnetics v.33 no.2 Magnetic Pole Shape Optimization of Permananet Magnetic Motor for Reduction of Cogging Torque Chang-Seop Koh;Hee-Soo Yoon;Ki-Woong Nam;Hong-Soon Choi
  6. Simulation and Design of Applied Electromagnetic Systems Reduction of Mechanical Noise and Vibration for Permanent Magnet Electric Rotating Machines K.J. Joo;H.S. Choi;S. Y. Hahn
  7. IEEE Trans. on Magnetics v.29 no.2 Finite Element Modeling of a Synchronous Machine:Electromagnetic Forces and Mode Shapes M.E.H. Benbouzid;G.Reyne;S.Derou;A.Foggia
  8. IEEE Trans. on Magnetics v.29 no.2 An Approach to Modelling of Magnetically Excited Forces in Electrical Machines D.Verdyck;R.Belmans;W.Geysen
  9. IEEE Trans. on Magnetics v.28 no.2 Procedure for the Numerical Computation of Mechanical Vibrations in Electrical Machines G. Henneberger;Ph.K.Sattler;W.Hadrys;D.Shen
  10. IEEE Trans. on Magnetics v.25 no.4 Determination of Synchronous Motor Vibrations due to Electromagnetic Force Harmonics Y. Lefevre;B.Davat;M.Lajoie-Mazenc
  11. Journal of Vibration and Acoustics v.116 Optimization of Magnetic Pole Geometry for Field Harmonic Control in Electric Motors B.S.Rahman;D.K.Lieu
  12. IEEE Trans. on Industry Applications v.32 no.6 Vibration Modes and Acoustic Noise in a Four-Phase Switched Reluctance Motor Roy S.Colby;F.M.Mottier;T.J.E. Miller
  13. Proc. of Incremental Motion Control Systems & Devices Fourier Decomposition of Radial and Tangential Forces in Bushless DC Motors Duane Hanselman
  14. IEEE Trans. on Magnetics v.32 no.5 Torque and Unbalanced Magnetic Force in a Rotational Unsymmetric Brushless DC Motors G.H.Jang;J.W.Yoon;N.Y.Park;S.M.Jang
  15. Design of Brushless DC Spindle Motors for High Speed HDD recording Z.J.Liu;S.X.Chen;Q.D. Zhang