Great question! That's where the testing will come in handy. If I had to guess, I would say that it works fine with anything from a small permanent magnet bike motor, to a 6.7" diameter 60 pound Series wound DC motor, to an 11" diameter warP series wound DC motor.
It has been tested on the bike motor, the 6.7" diameter motor, and Ben has started initial testing on his motor, which I don't know the diameter of. I think it's a 8" or 9" diameter. Also, Ian from Zero Emissions Vehicles Australia has used a home-made controller with a similar power section on his 11" diameter direct drive motor.
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