Motor speed control circuit
    1.
    发明公开
    Motor speed control circuit 失效
    电机速度控制电路

    公开(公告)号:EP0132361A3

    公开(公告)日:1986-04-30

    申请号:EP84304846

    申请日:1984-07-16

    IPC分类号: H02P05/408

    CPC分类号: H02P25/024

    摘要: A speed control switching circuit for a synchronous motor having windings to which identical switching circuits are coupled. Each switching circuit includes two transistors which are turned on and off alternately to drive current first in one direction through its winding and then in the other direction through its winding. When a transistor is turned off, the current through the winding decreases, and this current drop is sensed, and, at a predetermined dropoff point, the other transistor is turned on.