"---MIKE---" wrote in message
...
You can't change the speed of an AC motor. The speed is governed by the
60 cycle current.
---MIKE---
In the White Mountains of New Hampshire
(44° 15' N - Elevation 1580')
While the speed is determined by the frequency , it is easy to change the
speed. Just use an inverter such as:
http://www.emservicenter.com/Yaskawa.cfm
Where I work we have 100's of them. They range from fractional horse power
to over 100 HP motors.
For small motors , it may cost as much or more than the motor.