Motor drive device
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United States of America Patent
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Mar 1, 2011
Grant Date -
Feb 12, 2009
app pub date -
Nov 27, 2007
filing date -
Nov 29, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention presents a motor drive device capable of detecting jamming accurately without falsely detecting jamming when a movable part contacts with other members. Jamming by a backrest is detected by judging whether the value of a period of one pulse P1 and a period of the next pulse P2 (P2/P1) integrated for 150 times (integrated value: 150) exceeds a specified threshold (160) or not. Accordingly, if the backrest rubs against a backrest of an adjacent seat, and the motor speed suddenly drops for a short period, such 'warp' is not falsely detected as jamming, and only actual jamming can be detected securely.
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