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Thread: High Power UHU Thread (HP.UHU)

  1. #49
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    Default Re: High Power UHU Thread (HP.UHU)

    Try 4.7 ohm for starting point. None of those mosfets are good candidates for HP-UHU, If you want to try them is ok, But I am sure they will not be reliable, in the long term, even at 100V.

    kreutz



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    Default Re: High Power UHU Thread (HP.UHU)

    Thank you !

    Can you recommend better mosfets for DC motors - 130 V motor / 30 A for HP-UHU drive ??

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    Default Re: High Power UHU Thread (HP.UHU)

    Quote Originally Posted by kreutz View Post
    irfp4668: look at the SOA curve. At 30A the voltage limit is less than 100V. Not good for 130V motor. VR for the diode is specified at 100V.
    irfp4768: The SOA is a little better but at 30A is about 130V, it is not good to work at the limits of the SOA.
    The values of those resistors depend on the total gate charge of the Mosfet and dV/dt required.

    Best regards,

    kreutz
    kreutz, Isn't that SOA showing total wattage in linear mode ?
    IF your MOSFET is conducting 30 amps, i would assume the voltage across the mosfet is 30amps * 0.009 ohms which is 0.27 volts.
    This mosfet seems easily rated to handle a 30 amp motor at 130volts.

    But to drive a Mosfet with that much gate capacitance you would need programmable deadtime. and a lot of drive. And your switching freq would probably need to be about 10khz or lower. , imo

    Larry K

    Manufacturer of CNC routers and Viper Servo Drives
    www.LarkenCNC.com and www.Viperservo.com


  4. #52
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    Default Re: High Power UHU Thread (HP.UHU)

    I've been using the UHU HP servo on my mill and it works perfectly!
    But there are new DC servo motors 20Nm 120V and 400V 34A 11kW.
    Is it possible to improve the UHU HP servo for working with these motors?
    Maybe someone did similar?

    http://cncpendant.ru/en


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    Default Re: High Power UHU Thread (HP.UHU)

    I've personally tested my HP-UHU with a 160VDC supply and I'm running them with 130VDC (though they haven't been used much to be honest) so your 120V motors should be fine from a voltage standpoint. But how much current do they need? IIRC the inductors on the HP-UHU saturates at around 25A.

    As for running the thing at 400VDC I don't know. I guess you could start by looking at the required creepage distances on the PCB for such voltages, the connectors, the input filter capacitors, the MOSFETs (obviously). Not something I'd recommend.

    /Henrik.



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    Default Re: High Power UHU Thread (HP.UHU)

    Quote Originally Posted by H.O View Post
    But how much current do they need?.
    About 30A.
    I have only this label.
    High Power UHU Thread (HP.UHU)-161020121721-jpg

    http://cncpendant.ru/en


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