Re: [CAD_CAM_EDM_DRO] 400hz 3 phase motors?

vrsculptor wrote:

>Can anyone suggest a low cost source for high speed 3 phase motors? My
>inverter is good for up to 400hz. I was looking for around a one hp
>motor for use as a spindle. I don't know how fast you can drive a
>standrd motor.
>
>

Well, they use 115 V, 400 Hz, 3-phase in aircraft a lot. A 1 Hp motor at
22,500 RPM (accounting for slip from the synchronous speed of 24,000)
is amazingly small! Most modern VFDs can be programmed for variations
of the V/Hz curve to adapt to different motors. You will need series
inductors
between the VFD and the motor, because the motor will have a LOT less
inductance than a 60 Hz motor. 1 mHenry is about right for a 1 Hp motor.
I'd scan the surplus listings from Surplus Center and C&H supply in
Pasadena.
Herbach&Rademan might possibly have such a motor, too. There used to
be TONS of this stuff coming out of the missile silos, too, but that
decommissioning
has pretty well reached the end.

Jon