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The 1K resistor was to the input of the fet driver, not the input of the FET, I used a 4.7 ohm resistor to input of FET, Apparently putting a resistor in line helps with ringing prevention.

To all...

Sorry - I'm an idiot trying to be an electronics design engineer!!

I looked carefully at the datasheet and have the pinouts all wrong I followed the circuit on the top of the page assuming it was...

thanks Henrik I couldn't find an IRS21884 but I found an IR2181 which appears to do a similar job. However I cant get it working! I've only used low side FET drivers before and had no trouble.
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I've tried lots of things so far, to a point I have it working. But it's not working as smoothly or as nice as I would like, so I dont think there is anyway out of driving the high side also. - but...

Thanks for the comments, I'm not sure a TVS would do the job - unless it was huge. It would be dissipating a lot of power near enough to continuously? Arent they only made for transient voltages?
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BTW my dv/dt rise time for my motor back emf is around 1500V/us - also the motor is geared so when mechanically overrun is generating some 200V in reverse direction so that's well over the Vf of the...

Exactly Henrik, There is going to be power supplied to the motor when it's driven backwards (overrun) so unfortunately the relay idea wont work. It's also going to be run it at high freq PWM so would...

Thanks, but I'm not sure that's going to solve my problem. Electrically the motor is going to be only driven in one direction, however it will occasionally be forced backwards mechanically, and I...

I'm designing a drive to control a Brushed DC treadmill motor. The drive is going to be current controlled PWM via comparitor in PIC.

I have a 600V 70A IGBT that I plan using to switch the motor...