Re: [CAD_CAM_EDM_DRO] VFD and inverter duty 3phase motors

In a message dated 7/29/2004 8:40:22 PM Central Standard Time,
snaggletto@... writes:

Should I just get a regular ~3450RPM @60Hz motor, and limit my VFD to
60Hz, or should I go for an inverter duty motor where I can run much higher
frequencies/speeds. Any comments would be appreciated.<<
NO! You should get a motor DESIGNED for 400 Hz operation, with fresh
bearings, properly lubricated for that speed. If you go [deleted]ing with a 60 Hz
motor on 400 Hz, even if you DO manage to get the voltage right for that f, you
will PROBABLY injure yourself! When five pounds of steel (armature) designed
for spinning at 3600 RPM is spun at 24,000 RPM and the bearings seize-up, you
are talking major discobobulation! DON'T DO IT! See Perske, etc. BUY one
made for the purpose!


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