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Hi Mark,
I have had an idea of the controller built in this modular design. It would all be held together by the buss bars and the heat-sink. The only interesting thing would be supplying the pwm to the mosfet drivers. On my controller I redesigned the control board to have 3 molex outputs that small identical length pigtails could connect the 3 driver boards. With a modular board there will be a limit, Most likely the number of modules. An idea I just had about this could be a small daughter board that would breakout the single pwm into X, one for each driver board.
-Adam
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