Hi SeanThanks for the suggestion. It is a high spindle speed and the rating
plate states '400 - 1200 Hz'. that's the problem, most 3 phase inverters
I've checked out are either square wave, (too lossy at this frequency) or
low cycle, 60 Hz. I was hoping for a PIC based design running PWM at high
frequency.
Cheers Andy

On Wed, Apr 15, 2009 at 2:30 PM, Sean Breheny <shb7@cornell.edu> wrote:

> You can buy small, inexpensive variable frequency drives (VFD) which
> are meant to drive small industrial motors. However, 400-1200Hz seems
> very high - usually full speed is 60Hz AC input and you need to reduce
> the frequency for lower speeds.
>
> Sean
>
>
> On Wed, Apr 15, 2009 at 2:06 PM, graham foulkes <bespoken1@gmail.com>
> wrote:
> > Hi, What a great group of people. Anybody got any suggestions about
> driving
> > small, high speed 3 phase motors. I have a small die grinder that runs up
> to
> > 10,000 rpm. Plate says 'MOGFREKVENS H F 400 - 1200 Hz 3PH  17 - 50 volts
> 75
> > watts. The manufacture  I think it is Swedish manufactured but the motor
> > plate has been defaced . No 563 Rotorn Fabric Hallas Stilla PA  Inkopplad
> > motor is all that is ledgible.
> > Regards Andy
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