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Question How to protect your IBT_2?

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Design89, Jan 14, 2023.

  1. Design89

    Design89 Member

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    My Motion Simulator:
    3DOF, DC motor, Arduino, Motion platform
    I'm using wheelchair motor's 22,5 volt 17,5 amps and 24 volt 25 amps power supply. With some IBT_2's.
    Each motor has his own PS and IBT_2. It did work for like a few minutes and then the IBT_2 failed...

    Now I did test it with a 12V battery as a power supply and it works fine.

    How can I protect the IBT_2 when using the 24 volt PS (turned it down to 22V)?
    I have some capacitators 2200uF 25V laying around. Should it be enough to put 2 in series and then several pairs in parallel to protect the IBT_2's or is there a better solution instead of a battery?
  2. Ads Master

    Ads Master

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  3. Gadget999

    Gadget999 Well-Known Member

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    It probably shut down due to overcurrent or over temperature

    If you turn it off and on again does it now work ok ?
    Last edited: Jan 14, 2023
  4. Design89

    Design89 Member

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    Unfortunately no, one IBT is already broken @Gadget999. It turns in only 1 direction at full power..

    Could be some power delivered back from the motor? Or the IBT has both bridges open at the same time?
    Got 2 left now and testing with the 12V battery, that works fine.
    Last edited: Jan 15, 2023
  5. wingert

    wingert Member

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    look in data sheet about the spec, and replace it with other type which can deliver more current and voltage, and use same heat sinks.
  6. Design89

    Design89 Member

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    My Motion Simulator:
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    IBT_2 should handle up to 43A and 27.5V. They have already heatsinks on them.
    That's why I suggested some capacitators 2200uF 25V laying around. Should it be enough to put 2 in series and then several pairs in parallel to protect the IBT_2's.

    Do you have a better suggestion?
  7. wingert

    wingert Member

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    If IBT2 is a FET there are plenty that can deliver more current 80-160A and voltage.
    Consider switch on current which can exceed the limits.
    • Like Like x 1
  8. Design89

    Design89 Member

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    Do you have an example that doesn't cost 100 euro each?

    Those IBT_2's are used a lot here, but I cannot find a good solution.
  9. wingert

    wingert Member

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    N-CH MosFet IRF 1404, 40V 162A, some electronic provider offer the possibility searching for current and voltage.
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  10. Design89

    Design89 Member

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    My Motion Simulator:
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    Searching on the internets I came across this possible solution with capacitators.


    https://www.electrical4u.net/induction-motor/single-phase-motor-capacitor-calculation-calculator/
    In my case I would need capacitors around 50V 2200µF for my 330 watt motors. I have 25V 2200µF capacitors. So I will try to put 2 in series and 2 of those in parallel, 4 in total for one motor. That should make 50V 2200µF. I did use 80% for motor efficiency.
    And for my 235 watt motors it would be 1200µF, so only 2 in series would do it I hope. Missing only 100µF in that case.

    I will try this theory hopefully this week somewhere and post the results here.

    At the moment busy with some design changes. I have to finish that first before I can test properly.
    For those who are interested: https://www.xsimulator.net/community/threads/diy-sim-from-wheelchair-parts.17453/
  11. Gadget999

    Gadget999 Well-Known Member

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    every time you motors change direction the capcitor will be discharged and then charged again in the opposite direction - you may need to fit them across the powersupply not the motor
    • Like Like x 1
  12. wingert

    wingert Member

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    common switch-mode power supply design have this capacitors, so he enhance his power supply.
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  13. Design89

    Design89 Member

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    Nice option, only thing is that at this moment I do not want to build my own moto drivers like an IBT_2.
  14. Design89

    Design89 Member

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    I will try this later.
  15. Design89

    Design89 Member

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    My Motion Simulator:
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    But will it protect my IBT_2 that way?