Brushless motor driving circuit

Details Brushless motor driving circuit Brushless motor driving circuit

H - Electricity

02

P

318/96

H02P 5/00 (2006.01) H02P 6/20 (2006.01)

Patent

CA 1086376

BRUSHLESS MOTOR DRIVING CIRCUIT ABSTRACT OF THE DISCLOSURE A driving circuit for a brushless motor of the type having a permanent magnet rotor and plural phase stator windings. The driving circuit includes position detectors for detecting the rotary position of the rotor. Switching devices are provided for supplying driving currents in sequence to the plural phases of the stator windings in accordance with the position of the rotor. The durations of the driving currents are controlled such that a portion of such currents flowing through adjacent phases are over- lapped when the motor is started up; but the duration of each driving current is reduced as the motor approaches a normal speed so as to correspondingly reduce the overlapped portions. Prefer- ably, the durations of the currents are reduced as the speed of the motor increases until such currents no longer have overlapped portions. -i-

283732

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