Re: Electric Motor Speed Control
- From: Jeff Wisnia <jwisnia@xxxxxxxxxxxxxx>
- Date: Mon, 03 Dec 2007 18:58:27 -0400
SteveC wrote:
I have a 1 hp electric motor (110 volt) and I want to be able to control the speed from slow to fast and in small increments.
What basically do I need?
Or where will I find the answer.
Thanks.
First you should tell us what type of motor you are asking about.
And, what "slow" and "fast" mean in real RPM numbers.
If it's a "universal" motor (One with brushes in it.) you could vary its speed with a solid state speed controller, a device which is similar to a solid state lamp dimmer, but may cost a bit more. That'll work, but the set speed will vary somewhat if the load changes.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=43060
If it's an induction motor, about the only way you can manipulate its speed electrically is with a variable frequency converter. They're not cheap, and they won't give you an extremely wide range of speeds either.
http://en.wikipedia.org/wiki/Variable-frequency_drive
If its an induction motor I think Speedy Jim's suggestion of using a variable speed pully system, with perhaps a secondary pair of stepped pulleys to give you a wider range would be a fine way to go, particularly if you need to get near full power over a wide range of near constant speeds.
Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.
.
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- From: SteveC
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