Open/close body drive device
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United States of America Patent
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Oct 27, 2009
Grant Date -
May 14, 2009
app pub date -
May 23, 2006
filing date -
Jun 13, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
The open/close body drive device is capable of restarting a brushless motor, without using magnetic pole sensors, so as to securely drive an open/close body in an arbitrary direction when any of the magnetic pole sensors has failed. When a CPU (1) detects an abnormal logic as a detection pattern of the magnetic pole sensors (9), the CPU (1) determines that the sensor has failed and temporarily stops drive of a DC brushless motor (5), and a motor drive unit (4) generates a phase switching signal to prolong one of electric connection patterns for performing sensorless drive when restarting the DC brushless motor (5).
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