MOSFET AND IGBT fail in pwm speed control for 260VDC 2200W universal motor

[kandilx]

hi all i am new here , i was working the past 2 weeks to make PWM for an existing 240VAC 2200W but i will run it on DC 260V instead from 20 12V batteries for and electric car project i am working on i did try this circuit
**broken link removed**
with 555 timer but i changed the MOSFET to W26NM60N 26 amps 600V and IRFP460 20 amps 500V both run a small 12v 1A motor good but when trying the 2200w it fail after about 5 s when i try to increase the speed D and S go short circuit and sometimes g and d and s,
the next step i did is searching for MOSFET driver i did find several and try this one
http://www.sampson-jeff.com/tcrobowar/motor1/ver1.htm
(last circuit in the page)
and i connect a p mosfet to drive and IGBT GT80J101 80A 1kV which btw cost much
i did run the small motor but fail at the same way with the other
failed component didn't even get warm before failing
only once i try connecting 3 parallel IRFP460 and using first circuit it did run for a while all 3 were hot and in the second try only one get warm and fail
i did find this article very useful but it didnt solve my problem and i did connect fast diodes throw the motor terminals and throw D and S for safety reasons
all my trials has been stopped now i didn't know what to do and i have a deadline to finish the project before the end of this month
so help will be appreciated
thanks

 

[skylarks]

First of all you have to ensure the right biasing of mosfet it should be near to peak value of the mosfet ie.12v to 20 v according to its datasheet.secondly add snubber across mosfet to protect it against back EMF. I hope it will solve your problem

 

[kandilx]

First of all you have to ensure the right biasing of mosfet it should be near to peak value of the mosfet ie.12v to 20 v according to its datasheet.secondly add snubber across mosfet to protect it against back EMF. I hope it will solve your problem

thanks for your reply but how to select the appropriate snubber ?!