I believe that the drive frequency at idle was in the 30-40 HZ range. I will have to take a measurement to make sure.
While you are correct about the lack of efficiency at higher frequencies, and increased current draw at lower frequencies, we need to remember that the voltage increases with higher frequency, so the net effect should allow the 220Hz 25V transformer to work over a fairly wide rpm range.
Of course one could rectify the output voltage of the motor, and then do a DC/DC conversion. That would be more complex than a simple transformer, but would be more efficient.
It may be possible to just rectify the ac, and charge a large capacitor, and to run the existing DC/DC as the charger, since it is designed to operate from 120VDC to 180VDC ?Lots of possibilities.
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