| 摘要 |
PURPOSE:To enable to stably control a motor even if the operating state of the motor is set to any operation mode by varying a motor feedback signal to the reverse polarity to the output of a current deviation inverting amplifier by using a polarity discriminator. CONSTITUTION:A speed deviation inverting operational amplifier 26 outputs a speed deviation signal (c), and a current deviation inverting amplifier 36 obtains a current deviation from the difference between a signed motor current signal (e) and a current reference signal (c). This control signal (f) is discriminated in the polarity by a polarity discriminator 40, and a signing circuit 34 signs the signal (e) to become reverse sign to the output of the amplifier 36 on the basis of the output of the discriminator. |
