Maybe this will help?
You can drive the IMA rotor using the original ima controller with a square wave generator, ie a 3 phase rc car speed controller that also works on the same principle. Of course you need to have the ima rotor position sensors connected, but the main guts can handle up to 600 volts, 600 amps, the other parts use between 12 and 24 volts.
I got some misleading info that I could use a square wave generator to work the ima controller to make the ima system do what you want, but they it got too complicated too fast for me to manage.
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