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I've been looking into using an off the shelf AC drive for a while now using 48 X12v 22AH batteries (570V) and a 480V 3 phase motor. Out of the drives I have investigated the NXI series from Vacon seems to be the closest match to a battery vehicle setup. the NXI range run from a DC bus, intended to maximise efficiency in factories with lots of motors, saving energy by feeding current back to the DC bus when the motor is on overrun. I am not sure how the drives would react in a vehicle situation in sensorless mode, aparently the drive can calculate the rotor speed from its measurements of the outputs to the motor, but i dont really understand how this would work. There is a speed control for the drive which could be connected to a throttle pedal, but in the car situation we are not looking for a set RPM as such, we are looking at varying the torque output of the motor.
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