How to replace IGBT with Mosfet

Discussion in 'General Electronics Chat' started by hosam, Nov 16, 2008.

  1. hosam

    Thread Starter New Member

    Oct 10, 2008
    3
    0
    I have a DC motor speed control board it use this part CT60AM it control 3HP DC motor and it is usualy destroyed for this I want to change it with mosfet .and the flyweel diode how many amper will be.
    can any Expert man help me
     
    Last edited: Nov 16, 2008
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Select a FET whose specs match the IGBT's. Voltage and current are critical. You may have a challenge with the voltage rating if that is significant. here is a link to the datasheet - http://www.datasheetcatalog.com/datasheets_pdf/C/T/6/0/CT60AM-18B.shtml.

    The reverse diode needs to match the FET for voltage. Having the motor spec might help with expected current.
     
  3. hosam

    Thread Starter New Member

    Oct 10, 2008
    3
    0
    thank you for your reply .

    the motor is 3 hp , 180vdc , 6.5A at 5400 rpm what The spec of the reverse diode needs for this motor
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The diode calculation depends on the inductance of the motor and PWM frequency - http://www.reliance.com/prodserv/standriv/d7172/d7172.htm.

    It looks as if the FET need only be rated for 250 volts, but needs to be able to handle motor stall current, which will be much more than 6.5 amps.
     
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