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Ralph Mowery Ralph Mowery is offline
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Default Electric Motor Speed Control


"---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.