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Thread: braking resistor for Induction moter (URGENT HELP)

  1. #1
    Join Date
    Nov 2017
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    malaysia
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    braking resistor for Induction moter (URGENT HELP)

    I am facing big issue in the Induction motor drive system. I am using IM drive system with three phase inverter and three phase 2hp induction motor with Dspace 1104 .I am running the motor at rated speed 1400 rpm with 540vdc coming from rectifier . I am using 4 capacitor as filter circuit. My problem when i reverse the motor speed ,my IGBT always shorten ( The IGBT rate is 1.2kv and 75A),while in motoring mode the drive system can run perfectly at 540vdc and ONLY trip if i reverse the speed from +1400 to -1400 rpm .

    I suspect the regenerative power coming from the motor,so i installed 8 resistor with 2.1K 5 watt to absorb the regenerative power,however this effects the drive system in the motoring mode( forward speed) it broke the igbt at 400 vdc .So i dont know what resistor value i should select and what wattage in order to prevent the regenrative power and doest affects the drive in the motoring mode.




  2. #2
    Join Date
    Oct 2007
    Location
    New Jersey
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    4,731
    Quote Originally Posted by nabil2018 View Post
    I am facing big issue in the Induction motor drive system. I am using IM drive system with three phase inverter and three phase 2hp induction motor with Dspace 1104 .I am running the motor at rated speed 1400 rpm with 540vdc coming from rectifier . I am using 4 capacitor as filter circuit. My problem when i reverse the motor speed ,my IGBT always shorten ( The IGBT rate is 1.2kv and 75A),while in motoring mode the drive system can run perfectly at 540vdc and ONLY trip if i reverse the speed from +1400 to -1400 rpm .

    I suspect the regenerative power coming from the motor,so i installed 8 resistor with 2.1K 5 watt to absorb the regenerative power,however this effects the drive system in the motoring mode( forward speed) it broke the igbt at 400 vdc .So i dont know what resistor value i should select and what wattage in order to prevent the regenrative power and doest affects the drive in the motoring mode.


    This has been addressed in your original thread.

    DON'T try to home-brew a control system for this motor. Go buy a variable frequency drive (VFD) sized for your application. You have probably spent enough man-hours on this that you could have paid for the VFD already.

  3. #3
    Join Date
    Dec 2012
    Location
    Placerville, CA, USA
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    18,366
    The original post on this topic is here.

    Please do not start more than one thread on the same question.

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