Re: high frequency spindle motors

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "mayfieldtm <mayfiet@i...>"
<mayfiet@i...> wrote:

> I have a question about VFD's
>
> Is the full horsepower rating available over the
> full speed range?
> With my current Belt Drive, if I choose a slower
> belt position, my spindle torque goes up.
> Maintaining approximately same Horsepower.
> Does torque increase with slower VFD speeds?
>
> Tom M.

No. When you lower the speed of a motor using a
VFD, the torque remains constant, and the HP drops.
You can raise the speed above the nominal value,
in which case the HP remains constant, and the
torque drops off. Just don't go too fast, or you
may have problems with vibration, bearing life,
belts and gears, etc.

John Kasunich