PWM- DC speed Motors

Discussion in 'General Electronics Chat' started by Tree1, Feb 18, 2011.

  1. Tree1

    Thread Starter Member

    Nov 30, 2010
    46
    0
    Suppose there are two DC motors controlled by PWM designed for the same application but they are made by different companies. One motors starts to limit its voltage and current draw after 67% duty cycle while the other continues to respond to increases in duty cyle. What could be the issue with other one? Less efficient circuity ?? Different transistors ??

    Kindly advice someone..Thanks!!
     
  2. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    Sounds like one has a current limit that is set lower than the other. Current limit typically prevents currents above some reference. This does not imply a change of efficiency with the onset of limiting action.

    You would compare the drives output ratings as a comparison. Voltage as a match to the motors needs, current as a matter of power output. Adjustability in regards to ramps/spd or current limit/compensations/braking/etc. need to be evaluated on a 'as required' basis.
     
    Tree1 likes this.
  3. Tree1

    Thread Starter Member

    Nov 30, 2010
    46
    0
    Thanks "Getdeviceinfo". Def. useful information!! Thanks again
     
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