Motor control circuit, motor system, and motor control method
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United States of America Patent
Stats
-
Nov 6, 2012
Grant Date -
Jul 8, 2010
app pub date -
Feb 19, 2009
filing date -
Mar 4, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a motor control circuit which controls energization of a coil on the basis of a detection result of a rotor position, control is performed so that continuous rotation of the rotor by inertia is suppressed, rotation is stopped quickly, and reverse rotation of the rotor is prevented. When an external control signal CTL is changed from L to H, the normal rotation control is switched to reverse rotation control, and a reverse brake state is effected. When motor rotation speed is monitored and reduced to a set rotation speed, a brake control signal SPSB is changed from L to H, and a short brake state is effected. However, the motor continues to be rotated by its own inertia, and a position detection signal HALL is changed. Thus, reverse brake control is temporarily performed (only during a time period corresponding to a pulse width TRB). The short pulse reverse brake control is intermittently performed until the motor is completely stopped.
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