I don't quite understand the use of the stepper -- is it to move the timing of the motor/brushes?
You have a 1.3 MW system!?!?!?The Wrightspeed X-1 only used a 165 kW inverter and motor, and that was plenty fast...
The Wrightspeed X-1 only used a 165 kW inverter and motor, and that was plenty fast...
You do need a stepper drive. The Arduino cannot control the stepper directly; it needs to be able to energize the two coils of the stepper with ~1A of current (the Arduino pins are limited to 40ma) in an alternating and reversing pattern that's unnecessarily difficult to build just from components. That drive is a little overkill though and you could find a smaller and less expensive option if you haven't purchased it yet.
To add an image you just need to tag it like [ img] http://www.foo.com/ [ / img] (but without the spaces).
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