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2 Questions about electric motors

Discussion in 'Beginner Electronics' started by Michael, Nov 15, 2005.

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  1. Michael

    Michael Guest


    I have a 36v motor that i need to control. I thought abouit using multiple
    6v batteries, then stepping up the voltage. Would this damage the motor?
    At what level is it best to run a motor at, in terms of % if stall was 100%?


  2. Don Kelly

    Don Kelly Guest

    How you control the motor is somewhat dependent on how large it is and what
    you are using it for. You can get crude step control by using 3,4,5, or 6
    batteries in series- for small motors. At lower voltages, the control will
    not be particularly effective as the available torque drops. A source of 36
    to 40V with an electronic control will work well or, if the motor is small
    enough (and a 36V motor may well be too large) use of resistance control.
    I assume that this is a permanent magnet DC motor or you can separate the
    field from the armature circuit if a shunt motor.

    As for the level of operation - depending again on the motor, the best
    operating point is at a load well below stall -say under 30% of stall
    torque. It depends on the motor characteristics and type but for a PM DC
    motor or separately excited motor, the peak power output will be at about
    50% of stall torque and current.
  3. JeffM

    JeffM Guest

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