| 摘要 |
A brushless dc motor control circuit for driving and controlling a brushless dc motor having a magnetized rotor, a plurality of drive coils disposed in the vicinity of the magnetized rotor and a plurality of magneto-sensitive elements responsive to a magnetic field generated by the rotor, which comprises coil drive means for energizing the drive coils in accordance with changes of the electric characteristics of the magneto-sensitive elements, and bias supply means for supplying bias currents to the respective magneto-sensitive elements. The bias supply means changes the flow direction of the bias currents for a short period when the dc motor is to be stopped thereby to apply a brake torque to the magnetized rotor to perform a quick stop of the dc motor.
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