Re: [CAD_CAM_EDM_DRO] Re: hi-freq motors[perske etc]

mika.salmi@... wrote:

> --- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
> > carlcnc@y... wrote:
> >
> > > I run Perske and a Colombo hi-freq router motors on my cnc.
> > > I have often wondered WHY ther are no US manf of this type
> > > motor/spindle??
> > > Surely it can't be cost vs sale price. Perske is from
> Germany,Colombo
> > > from Italy.
> > > Seems to me that the European makers own the market.
> > >
> > > Perske,Elte,Colombo are the only ones readily available.
> >
> > How about Onsrud/Danly (BIG spindles) and Rockwell/Precise?
> > The Onsrud is definitely made as a wood router, the Rockwell/Precise
> > is made for internal grinding, but could be used for other purposes.
> > Where do you get the inverters to run these motors? I have
> > figured out how to use late-model VFD's that go to 400 Hz, but
> > that limits spindle speed to 24,000 RPM.
> >
> Actualy Yaskava varispeed VFD in version G can output 1000Hz
> , problem would be finding low cost motor which can handle this speed
> even in 6 pole motor , I have tried to run 1000rpm 50Hz 6 pole motor
> in 400 Hz and result was not so good !

Thanks for the pointer on Yaskawa. I HAVE the motors, now 3 of them!
2 drill spindles and a general purpose spindle. I also had a Danly
15,000 RPM spindle, but it was way too big, so I sold it again.

I'm not trying to run 50/60 hz motors at high speed, these motors were
designed for this application, and so they have the correct number of
turns to get reasonable voltages at those speeds. The Westwind
runs at 80 V at 400 Hz, so it would want 160 v at 800 Hz.

Jon