| 摘要 |
PURPOSE:To remove torque ripplet from a DC motor by controlling an armature current in response to the produce of the armature current and a counterelectromotive force. CONSTITUTION:A bridge circuit is composed of resistors 2, 3, 4 and a DC motor 1, and a transistor 8 is connected between output terminals of the bridge circuit. A multiplier 7 multiplies the counterelectromotive force detected by the collector resistor 3a of the transistor 8 by the armature current detected by the resistor 2. When the output voltage of the multiplier 7 exceeds the shifting voltage by diodes 6a, 6b, the collector current of the transistor 6 is abruptly increased so that the voltage drop due to the resistor 5b is abruptly increased. Accordingly, the base voltage of the transistor 5 is lowered, and the voltage applied to the bridge circuit is decreased. In this manner, torque ripple can be removed from the motor. |
