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motor control circuit

Discussion in 'Electronic Basics' started by [email protected], Oct 4, 2003.

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  1. Guest

    I have an application where it is not possible to use a limit switch
    to stop a drive motor on a chain driven turret.

    What kind of circuit is used to detect that a motor, ac or dc, has
    stopped and instantly cuts voltage to the motor. And then immediatly
    allows the motor to be restarted with a switch in a forward or reverse
    direction?

    Thanks for the help.
     
  2. http://www.google.com/search?q=automatic+motor+reverse
     
  3. default

    default Guest

    Current detection wouldn't work? AC and DC motors see a sharp rise in
    current when they stall.

    You would need to operate a latching circuit relay or electronic, and
    let the new command override the latch. For start up there would need
    to be some delay introduced to momentarily disable the current sensor
    so it wouldn't just trip out again.
     
  4. Ardent

    Ardent Guest

    X-No-Archive: yes

    > wrote in message
    I have seen in car window mechanisms voltage across a thick conductor
    is monitored and when the motor stalls (when window hits the top) the
    voltage drop increases and an opamp senses this difference and stops
    the motor.

    HTH
     
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