I have an electric motor that rotates at 1750 rpm and I would like to slow it to maybe 100n rpm. Is that possible with out gearing?I am looking for an affordable solution.
Thank you.
Paul

Yes, it can be done. But you must not load it fully when slowed down, because the cooling of the motor is less efficient when it goes slower.
Is it an AC or a DC motor?
A DC motor: lower the voltage.
An AC motor: use a dimmer (mind the maximal wattage).

100n rpm? Did you mean 100 or 1000? For all but the smallest motors, it might be cheaper to buy another motor. Try www.meci.com.

If you are interested, Labman, I'll send you the schematics of both regulators (AC and DC) to slow down a motor to 100 RPM without loss of torque.
And no, it is not expensive to build.
Only, the cooling eh...

If you could email it to me I would really appreciate it thanks in advance
My email is "[email protected]"

For some reason I did not get the messages from November and I just saw them now in looking at the reply dated xmas day.

I would appreciate the schematic veery much.

This is an ac motor and a dimmer will not work on it althouigh it will work on a drill for example,and I am trying for something like 100 rpm

Thank you
Paul

Oops I foorgot to add my email : [email protected]
Thanks again

I am trying to slow down a chop saw from 3800 rpm to say 1800 rpm so I can change blades from a cut off blade to a metal blade. Any ideas how I can do this?

I wanted to control the motor speed of my fireplace blower. It had
2 speeds - high and higher. You could literally roast a turkey with it. But,
As with many AC motors it appeared to be impedance controlled, and
Varying the line voltage levels with a rheostat would not work.

There are a lot of ideas floating around which you can see on Google
With `-circuit for slowing down ac motors-

Small motors like an elecric drill can be slowed with a light dimmer
Or a circuit like
This(http://ourworld.compuserve.com/homep...den/page12.htm
And http://www.national.com/ds/LM/LM117.pdf

Paul

What are you using the Motor for? I would go with a DC Motor from a Treadmill Machine.. Just be sure to get the Speed Controller and the full harness to modify it.. Those Motors have more torque than you think.. I'm thinking about adding one to a Metal Cutting Bandsaw I have.. -Rob

If after 5 years this guy doesn't have an answer then I doubt he really wanted one.

Yes, you are right... but I think that his comment is still very valuable for other web surfers... don't you think so ?

urmod4u, are you still there?
Id like to see your schematic as well. If I may add a question to this thread...
I want to build something that can slide a heavy weight slowly back and forth, with a pause at each end. The travel distance needs to be between 4-10 ft. the weight would be all attached to a flat frame that I can hang from heavy duty channels and bearings - so this frame would be supported by other means, but I need a motor that is strong enough to push and pull it along its tracks. (any where between 100-600 lb.)

Bonus's would be
*adjustable travel distance
*adjustable speed
*adjustable pause time at each end

I was trying to investigate hacking a garage door opener, thinking I could make a physical switch at each end that could press the button and send it in the other direction... but then I started reading about motor controllers, and stepper motors and servo motors and I'm lost. In way over my head.

Do you have any words of wisdom for me? Any ideas you think I should explore?