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

 

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.

 

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.

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

 

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.