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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

    Hi,

    1.
    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?
    2.
    At what level is it best to run a motor at, in terms of % if stall was 100%?

    Thanks

    Michael
     
  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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