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I've set it up so I have an equivalent resistance of 6ohms from one of the coils which is in series with a parallel unit consisting of a 25ohm coil and the 5ohm motor and a 50ohm coil which are in series. There is a bridge rectifier on the motor by the way.

I've calculated the total current and voltage drop over the 25 ohm coil assuming the motor resistance is infinite and it comes out to be 96V. This works nicely since 96 * (5/50) = 9.6V dropped over the motor, and the rest over the 50ohm coil.

The only issue I'm having is that the motor comes before the coil, so the motor itself is supplied the full 96V. Is this a problem? Or does the fact that it only uses 9.6V of the 96V allow it to work? We are assuming the motor is a 12V motor