| 摘要 |
PURPOSE:To perform a remarkable contraction of the absorbing time of a counterelectromotive force and to eliminate an oscillation sound in a motor by using a resistor for absorbing the counterelectromotive force. CONSTITUTION:In the operations of chopper transistors Q1, Q2 and phase switching transistors Q3, Q4, when a constant current is flowed in a direction of an arrow A, the transistors Q2, Q3 are operated, and when a constant current is flowed in a direction of an arrow B, the transistors Q1, Q4 are operated. A comparator IC2 turns ON and OFF the transistors Q1, Q2 while comparing the output of a differential amplifier IC1 with a reference voltage VRef. Further, counterelectromotive force absorbing resistors R1, R2 are inserted in series only for the diodes D1, D2 in which the counterelectromotive force is flowed. |
