Single Phase Electric Motor Windings

Discussion in 'General Electronics Chat' started by haidir, Dec 22, 2010.

  1. haidir

    Thread Starter New Member

    Dec 22, 2010
    1
    0
    please kindly help me!


    Resistance of Single Phase Motor Windings​

    Run to Common (R-C) : 4.6
    Start to Common (S-C) : 39.4
    Run to Start (R-S) : 44.0


    By referring to above , what are the effet if resistance for " run to common", "start to common" and "run to start" exceed or below the value mentioned above?

    Best Regards,
    Haidir
     
  2. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    Answer: You can't tell by DC resistance alone.
     
  3. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    I'd say if they exceeded infinitely, that would be an open winding. On the other hand, if it was zero, absolutely, then that would indicate a shorted winding.

    Unless you could 'growl' the windings or view an obvious short, it is what it is.
     
  4. awright

    Well-Known Member

    Jul 5, 2006
    84
    7
    How did you measure the winding resistance? Your typical DVM or VOM is not capable of precise resistance measurements at these low values. Lead/clip lead resistance can add a finite and variable resistance to low value measurements.

    Unless you have an open or a shorted winding, you generally can't tell much from DVM resistance measurements.

    Care to tell us more about what you are trying to accomplish?
    awright
     
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