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OK, the motor will still see 400V pulses, so if its an insulation breakdown that is the problem, that will still occur even though the average voltage is only 200. The motor current will still be right up there, so will need heavy cables but the battery current will be half so you can use smaller cables for those connections.
ie if your controller limits the motor current to 500A, your battery current will be 250A (ignoring losses, etc) and the motor will be seeing an average voltage of 200v so the power input will be 200x500 = 100 kw.
Is that what you are thinking?
I wonder what the armature sparking will be like.
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