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Hmm... I've been thinking about the same problem. I've also got a high-speed spindle from an old LPKF, made by Alfred Jäger (a German company). It would be fine if I only can find new hi-speed bearings for it...
Perhaps this simple three-phase inverter might work, if modified to about 30 volts and 50...1000 Hz: http://www.geocities.com/the_beijing_dragon/drive.htm
At least the 60k rpm spindle uses a rather low voltage, if my memory serves.
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