| 摘要 |
PURPOSE:To improve the efficiency by providing means for preventing a current from flowing by opening an amplifier during a period that a current of a direction for disturbing the rotation of a motor is generated. CONSTITUTION:The outputs of Hall elements 15-17 which generate output signals in response to the rotation of a motor are input through an amplifier 18 to a matrix circuit 21, the output is amplitude-controlled by an amplitude controller 22, amplified by amplifiers 24-26, and then supplied to motor coils 27-29. A controller 30 receives the outputs of the Hall elements 15-17 to open the amplifiers 24-26 during the period that a current of a direction for disturbing the rotation of the motor, thereby preventing the current from flowing. |
