28 Nov
1999
28 Nov
'99
1:58 p.m.
<There's always the well-known kludge method. You get a 3-phase motor
<somewhat larger than the one you want to run (any such induction motor
<should work). You energise one winding from single-phase mains, using a
<capacitor to generate enough phase shift to another motor winding for it
<to start and run. Then use all the motor terminals as a 3-phase output to
<the motor you want to run. Effectively this new motor becomes a rotary
<converter.
<
<I assume the motors in disk drives are not that large, so this may well
<work. It's certainly been done for (small) lathe motors.
I've seen this done for motors in the 3-5HP range!
Allison