Re: [CAD_CAM_EDM_DRO] AC Motor Speed Controller?

Hi,

You haven't given enough information here, but the short answer is it can't
be done. What you probably have is a syncronous motor which switches in the
start winding with a centrafugal switch. The cap is to assist the start
winding by providing more power. As the rotor speed drops the start winding
swiches in which up the current requirement by a factor of about 10 with
resultant heat. Sycronous motors are rated by the number of starts/hour
because of the heat generated during starting.

The answer is pulleys, a three phase motor and VFD, a series wound motor or
a DC motor. Except for the three phase motor, all the others will produce
much more noise than a syncronous motor.

Regards,

Terry

> Hi Guys
>
> I am looking for information or availability for a Speed controller on
> my AC Spindle Motor for my Mill? It is a Capacitor start type of AC
> Motor. Any ideas who might carry a speed controller for this type of
> Motor would be appreciated. Thanks
>
> Regards
>
> Bill