发明授权
US07924526B1 Method of ramp stop detection for VCM velocity-controlled retract
有权
VCM速度控制缩回的斜坡停止检测方法
- 专利标题: Method of ramp stop detection for VCM velocity-controlled retract
- 专利标题(中): VCM速度控制缩回的斜坡停止检测方法
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申请号: US12620902申请日: 2009-11-18
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公开(公告)号: US07924526B1公开(公告)日: 2011-04-12
- 发明人: Siew Yong Chui , Edy Susanto , Jye Sheng Hong
- 申请人: Siew Yong Chui , Edy Susanto , Jye Sheng Hong
- 申请人地址: BM
- 专利权人: Marvell International Ltd.
- 当前专利权人: Marvell International Ltd.
- 当前专利权人地址: BM
- 主分类号: G11B21/02
- IPC分类号: G11B21/02
摘要:
A method and apparatus for controlling the parking of a transducer head in a disk drive. A drive current is provided to a motor which controls movement of the head in a direction to move the head to a parking position. The arrival of the head at the parking position is detected. Upon this detection, a drive stop sequence is initiated to stop providing the drive current a short time after the head reaches the parking position. In one embodiment, it is determined whether the head has reached the parking position by monitoring the back emf (bemf) of the motor controlling the head, typically a voice coil motor (VCM). The detection of a sharp decline in the bemf indicates the head has stopped.
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