公开(公告)号：US5901269A

公开(公告)日：1999-05-04

申请号：US847216

申请日：1997-05-01

Applicant: Chin-Chin Chang

Inventor： Chin-Chin Chang

IPC: H02K7/065

CPC classification number: H02P7/295 ,  H02P7/245 ,  G05B2219/42016 ,  Y10T83/141

Abstract: A speed regulating circuit for a motor of a power coping saw includes a DC voltage circuit, a manual speed regulating circuit, a feedback controlling circuit and a motor driving circuit. The DC voltage circuit includes a diode, a resistor, a capacitor, and a Zener diode. The manual controlling circuit includes a Zener diode and a resistance. The feedback controlling circuit includes an amplifier, a transistor, a pulse transformer. The motor driving circuit includes an SCR and a diode. The manual controlling circuit may first be set with a reference voltage signal corresponding to the intended rotational speed of the motor. The reference voltage signal is sent to the feedback controlling circuit to get a rotational speed controlling signal of a motor with respect to the variation of loads. A DC current is then supplied to the motor driving circuit for constantly rotating the DC motor despite the variation of the load.

Abstract translation: 用于电动抓钳的电动机的调速电路包括直流电压电路，手动调速电路，反馈控制电路和电动机驱动电路。 直流电压电路包括二极管，电阻器，电容器和齐纳二极管。 手动控制电路包括齐纳二极管和电阻。 反馈控制电路包括放大器，晶体管，脉冲变压器。 电动机驱动电路包括SCR和二极管。 手动控制电路可以首先设置有与电动机的预期旋转速度相对应的参考电压信号。 参考电压信号被发送到反馈控制电路，以获得电动机相对于负载变化的转速控制信号。 然后，直流电流被提供给电动机驱动电路，以恒定地旋转直流电动机，尽管负载的变化。