Re: 3 Phase/VFD question

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Bill Vance <ccq@x> wrote:

> Hi Jan;
>
> Not sure what I did with that catalog at the moment, but I do have

another.

> According to the Airgas/Rutland Tool catalog, there are several

models, and

> the RPMs listed at 60 Hz input are, 1710, 1725, 1740, and 1750.

and are rated

> at 1 to 3

horsepower.

Correct , that "ideal" RPM is the sychronous speed, IF the motor was
locked in on the supply frequency. "SLIP" is the reason that the
speed on the name plate is less than sychronous speed. Different
motors have different "slip" based on magnetic gap and iron
properties. AC motors are not meant to give you exact speeds.
Be safe, have fun,
Gary Shelton