Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Ramp Load/Unload Velocity Control of VCM Using BEMF in HDD

램프 로드/언로드 하드디스크 드라이브의 역기전력을 이용한 VCM 속도제어

  • 정준 (연세대 정보저장기기 연구센터) ;
  • 김태수 (특허청 기계금속심사국) ;
  • 강태식 (삼성전자 스토리지사업부) ;
  • 정광조 (삼성전자 스토리지사업부) ;
  • 이철우 (삼성전자 스토리지사업부)
  • Published : 2006.01.01
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Abstract

Since most of small form-factor drives have a load/unload mechanism and the flying height of the head is getting lower as the capacity of disk drives increases, the load/unload velocity becomes one of the important factors to ensure the reliability of the load/unload mechanism. To control the load/unload velocity accurately, velocity sensing is essential. In this paper, we introduce a very practical method that acquires the load/unload velocity from the back electromotive force (BEMF) of a voice coil motor (VCM) and propose a calibration method for measuring the BEMF from a given circuit. Moreover, the effect of calibration error and temperature variation on the measurement of BEMF is shown by simulation. Then, this present method is applied to the load/unload velocity controller and is verified from the experimental result.

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References

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