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  1. #21
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    Re: What is output voltage of 3 phase vfd

    Here is some results

    This is input voltage

    Click image for larger version. 

Name:	IMG_20180522_224845.jpg 
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ID:	146806

    This is output voltage phase to phase

    Click image for larger version. 

Name:	IMG_20180522_224434.jpg 
Views:	3 
Size:	80.5 KB 
ID:	146807






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  2. #22
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    Re: What is output voltage of 3 phase vfd

    As long you don't show oscilloscope waveforms of DC-bus to phase and phase to phase, I can't comment the measurement.

    I presume it's 3x120° system, not 90° which has of course lower output voltage.


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  3. #23
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    Re: What is output voltage of 3 phase vfd

    Hello
    Here is some output by Rc Filter

    Yes these measurements are 120degree phase shift

    This is output of spwm by which i am getting lower voltage from expectation
    Around 175vac phase to phase
    Click image for larger version. 

Name:	IMG20180523221447.jpg 
Views:	4 
Size:	510.6 KB 
ID:	146837


    This output of saddle pwm from both lower and higher channel of pwm


    Click image for larger version. 

Name:	IMG20180523222401.jpg 
Views:	3 
Size:	510.6 KB 
ID:	146839

    Click image for larger version. 

Name:	IMG20180523222224.jpg 
Views:	3 
Size:	517.6 KB 
ID:	146838


    Output voltage with spwm and saddle pwm is almost same still spwm gives more output voltage



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  4. #24
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    Re: What is output voltage of 3 phase vfd

    hello
    is this right ?
    if no then how to correct it ?



  5. #25
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    Re: What is output voltage of 3 phase vfd

    The second and third waveform look very different from any expectable inverter output. No idea how you managed top get it.


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  6. #26
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    Re: What is output voltage of 3 phase vfd

    i also thinking waveform is not like expected
    in 1st pic i use sine table method.



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