Invention Grant
US07466095B1 Voice coil motor control system and method using pulse width modulation
有权
音圈电机控制系统及方法采用脉宽调制
- Patent Title: Voice coil motor control system and method using pulse width modulation
- Patent Title (中): 音圈电机控制系统及方法采用脉宽调制
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Application No.: US11455476Application Date: 2006-06-19
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Publication No.: US07466095B1Publication Date: 2008-12-16
- Inventor: Siew Yong Chui
- Applicant: Siew Yong Chui
- Applicant Address: BM Hamilton
- Assignee: Marvell International Ltd.
- Current Assignee: Marvell International Ltd.
- Current Assignee Address: BM Hamilton
- Main IPC: H02P3/08
- IPC: H02P3/08 ; H02P7/00

Abstract:
A system and method for controlling an actuator includes a control module that communicates with a plurality of switching devices to generate current through a voice coil motor during a first time period so that an actuator arm rotates in a first rotational direction in response to the current. The control module controls the switching devices to discharge the current from the voice coil motor during a second time period less than the first time period so that the first rotational direction of the actuator arm is maintained after discharging the current. The control module further includes a back electromagnetic force (bemf) module for determining a bemf voltage after controlling the switching devices to discharge the current, and an actuator arm speed control module for determining an actuator arm speed in response to the bemf voltage.
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