[jackbauer]

The 8khz "squeal" is nothing like the curtis. Its only noticable when reving the motor in neutral with the bonnet open. When driving its not audible at all. From either inside or outside the car. Ok in theory it'd be easier on the bus caps to run at 16khz but they have steadfastly remained stone cold in my controller despite all attempts to warm them up! The max recorded heatsink temp was 35c after blasting the car up and down a hill for 15 minutes. I used one igbt as the switch and one identical device with its gate and emitter tied together as the diode. No regrets so far and cost peanuts.

Now I am using a compound motor if that makes any difference?

Paul quick question. Would it be possible to program the controller to limit the motor voltage? Well done on the can bus stuff. I used it many years ago and it was a real pain to setup but once running impossible to glitch.