thank you for your reply .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.
by Jake Hertz
by Duane Benson