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  1. #1
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    Apr 2012
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    Question Help ! Controlling 3-Phase AC Induction Motors Using the PIC18F4431

    I start learn 3 Phase AC Induction Motors Using the PIC18F4431. Pz help me pointing the wa. how to create a phase difference of 120 degrees and calculate the value of sine table, timer interrupts and frequency. I do not need to change in frequency.thank all .

  2. #2
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    Default Re: Help ! Controlling 3-Phase AC Induction Motors Using the PIC18F4431

    Here's some 3 phase for the PIC18F2431 chip. http://www.picbasic.co.uk/forum/cont...-DT-interrupts
    http://www.scalerobotics.com

  3. #3
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    Default Re: Help ! Controlling 3-Phase AC Induction Motors Using the PIC18F4431

    Thankiu very much ! i will read it .
    I intend follow this guide but does not change frequency and PWM Fault detection plz more help.
    http://ww1.microchip.com/downloads/e...tes/00900a.pdf
    Quote Originally Posted by ScaleRobotics View Post
    Here's some 3 phase for the PIC18F2431 chip. http://www.picbasic.co.uk/forum/cont...-DT-interrupts

  4. #4
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    Default Re: Help ! Controlling 3-Phase AC Induction Motors Using the PIC18F4431

    For that, I would use their source code! http://www.microchip.com/stellent/id...pnote=en020394

    The first link I shared only covers the
    how to create a phase difference of 120 degrees and calculate the value of sine table, timer interrupts and frequency.
    part.
    Attached Files Attached Files
    http://www.scalerobotics.com

  5. #5
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    Default Re: Help ! Controlling 3-Phase AC Induction Motors Using the PIC18F4431

    Once more , thank ScaleRobotics !


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  6. #6
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    Apr 2012
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    Default Re: Help ! Controlling 3-Phase AC Induction Motors Using the PIC18F4431

    And for 3 phase Power Control PWM, using a bit of Bruce's 18F2431 example :

    PTPERL = 206 'for 21.6khz
    PTPERH = 1
    Let me just how to calculate
    And timerone = 60950 ;gives about 60 htz sine
    Let me just how to calculate 60950
    And if I declare : PTCON0 = 0x00 ’Postscale 1:1, Prescale 1:1, Free Running
    PTCON1 = 0x80 ’PWM time base is on, count up!
    PWMCON0 = 0x20 ’Enable PWM0-1, Complementary
    PWMCON1 = 0x40

    I give 6 pwm (pwm(0-5)) connected to 6 IRG4PH50UD (3 phase inverter bridge)is ok ? Thank a lot!
    Quote Originally Posted by ScaleRobotics View Post
    Here's some 3 phase for the PIC18F2431 chip. http://www.picbasic.co.uk/forum/cont...-DT-interrupts
    Last edited by gaikieuuc; - 17th April 2012 at 17:57.

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