Control circuit of brushless dc motor

Details Control circuit of brushless dc motor Control circuit of brushless dc motor

G - Physics

11

B

318/96, 352/21.2

G11B 15/665 (2006.01) H02P 6/00 (2006.01)

Patent

CA 1180751

ABSTRACT A system for locking a rotational mechanism such as tape reel in a recording/reproducing apparatus having a control circuit for locking a brushless DC motor which can be used for a reel drive motor in a tape transport system, the control circuit including switching elements for energizing coils, of respective phases, with the motor, a drive circuit for supplying switching signals to the switching elements in response to rotational position detecting signals of the rotor of the motor and a switching device connected to the drive circuit for fixing the output condition of the drive circuit such that only one of the switching elements goes on to energize only one of the coils and the other switching elements remain off, the switching device being operable to rock the rotor.

404210

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