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electric motor stop circuit

Discussion in 'Electronic Design' started by [email protected], Sep 29, 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. Sounds very similar to a Stall Warning device. This would normally
    be done by sensing rotation of the motor shaft with (say) a Hall
    sensor. One pulse per revolution is adequate. When driving, the
    motor controller looks for a stream of pulses, if they stop then a
    stall is assumed. There is usually some start-up over-ride logic
    to let the motor come up to speed. Using a uP is handy because
    onsite fiddling with the timings only needs software changes.
     
  3. Maybe use a starting coil to keep a relay activated. There won't be
    much voltage there when the motor is locked and the starter isn't
    engaged.


    Your solution depends heavily on the exact type of motor you're using.
     
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