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Convert 1ph to 3phase for motor

Discussion in 'Sensors and Actuators' started by BlinkingLeds, May 4, 2013.

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  1. duke37

    duke37

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    Jan 9, 2011
    It looks as if the input to the chip needs to be a PWM signal at 20kHz. I presume that this would give a quasi sine wave output at any base frequency you chose. You will need a microcomputer to generate this.

    Switching a three phase motor every two minutes with a low inertia load I wouln't think a problem. The manufacturers should be able to help you. The life of the contactor may be limited.

    The single phase supply will need rectifying with big diodes and smoothing with big capacitors, these will be expensive. I would think that the efficiency is hardly likely to be much over 50%, will your generator supply the power?
     
  2. BlinkingLeds

    BlinkingLeds

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    Feb 23, 2013
    My generator is 3kw and the pump needs 2kw is that ok?
    Can i use a 555 or similar pwm for the 20khz insead of a uC?
    I have 20pcs of 1000uf 450v capacitors are these any good for smoothing?
    Thanks.
     
  3. duke37

    duke37

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    Jan 9, 2011
    This is well beyond my expertise.
    It seems that you are intent on going into an expensive development phase. I do not think I can help.
     
  4. BlinkingLeds

    BlinkingLeds

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    Feb 23, 2013
    Is there any other (simpler) way to do this?
     
  5. duke37

    duke37

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    Jan 9, 2011
    The obvious way is either to get a single phase pump or a three phase generator.
    Starting currents can be very high and the generator must be able to provide enough to get the pump up to speed.
     
  6. BlinkingLeds

    BlinkingLeds

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    Feb 23, 2013
    I though of these easy solutions but both require more than 500$ so can't afford it :)
    i would had tried to make it work with this IC but i don't want to damage the pump or burn the motor entirely.
     
  7. DuctDuck

    DuctDuck

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    Jan 26, 2013
    ........
     
    Last edited: May 8, 2013
  8. DuctDuck

    DuctDuck

    52
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    Jan 26, 2013
    I have a big list of possible sources for you.

    And this looks promising, yet doesn't include a proper config listing. But this one looks very good!

    Good luck!
     
  9. BlinkingLeds

    BlinkingLeds

    180
    0
    Feb 23, 2013
    Yep only looking at those price tags discourages me :) that's why i searched for a DIY solution.
    Thanks anyway
     
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