| 摘要 |
PURPOSE:To accurately perform the timing of a commutation by detecting the induced voltage of a drive winding when a commutation segment is OFF state, comparing the detected voltage with a reference voltage, and controlling the phase of a commutation control signal by the signal obtained by the comparison. CONSTITUTION:A commutator 3 is controlled by a commutation controller 4 to commutate the current of a drive winding 2. When the commutation segment in the commutator 3 is OFF state, the induced voltage of the winding 2 is detected by an induced voltage detector 5. The detected voltage and a reference voltage obtained by a power source voltage are compared by a differential amplifier 7, a synchronizing signal generator 10 is controlled through a converter 9 by the output to control the phase of a commutation control signal. |
