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3ph motor running on square wave?

Discussion in 'Sensors and Actuators' started by BlinkingLeds, Jul 8, 2013.

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  1. BlinkingLeds

    BlinkingLeds

    180
    0
    Feb 23, 2013
    I was wandering if a 3ph motor that normally runs on 3ph 400v sine ac can run on 400v square wave without damadge. I mean somethink like THIS?
     
  2. davidsmall

    davidsmall

    1
    0
    Jul 8, 2013
    the motor should have rated voltage, you need refer to the motor voltage.
     
  3. BlinkingLeds

    BlinkingLeds

    180
    0
    Feb 23, 2013
    I won't exceed the rated voltage i will only change the waveform from sine-wave to square-wave

    buy the way welcome to the forums ! :)
     
  4. BlinkingLeds

    BlinkingLeds

    180
    0
    Feb 23, 2013
    THIS site says :

    "Small multi-phase synchronous motors may be started by ramping the drive frequency from zero to the final running frequency. The multi-phase drive signals are generated by electronic circuits, and will be square waves in all but the most demanding applications. Such motors are known as brushless DC motors. True synchronous motors are driven by sine waveforms"

    So how do i know if a certain motor can be driven buy square wave or not?
     
  5. Y2KEDDIE

    Y2KEDDIE

    259
    15
    Sep 23, 2012
    Just about any ac motor will run on square waves.

    Think in terms of digital audio (music). You are trying to approximate a sine wave by chopping it up into lots of tiny pieces (on/off pulses).

    I this case you are altering the applied waveform to change it's duty cycle (on to off) which changes the power created by the motor.
     
  6. duke37

    duke37

    5,364
    771
    Jan 9, 2011
    I see no way out of this other than to try it.

    The square wave has a large amount of harmonics which will produce currents and power loss. The power supply may not like the load either, it will be far from resistive.
     
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