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|Topic Review (Newest First)|
|10-07-2012 02:26 PM|
I can make this work. Thx for the info
Lutron Skylark 300-Watt Light Almond 3-Speed Slide Ceiling Fan Control
|10-06-2012 08:35 AM|
At one time Radio Shack used to carry stuff like Potentiometers, but not sure if they still do...I tend to avoid going into crap-shack for the most part.
The op could look at some of the woodworking sites for a better quality Router Speed Control that was posted above but from Harbor Freight.
I agree with TR and that anything electrical in nature from HF is of questionable quality and durability...I'd hate to be jury-rigging something together using their stuff vs. what they were actually designed for, like using a router with that Pot.
|10-05-2012 07:10 PM|
A rheostat/potentiometer slows down the motor by intentionally wasting power, AKA generating heat, and it can get very hot even with a 30W motor (1/25 HP). A modern dimmer or speed controller instead uses a triac, which rapidly turns on and off completely, so it wastes little power and stays far cooler, regardless of the speed of the motor or brightness of the lamp
I'd be scared of using a motor controller from Harbor Freight because the quality of their electronic products tends to be very, very low, but HF is really good about warranties, at least during the first 90 days. OTOH about every light dimmer sold at hardware stores, Wal-mart, and Home Depot is UL or CSA approved for safety, so as long as you put it in a steel box and use a 3-wire grounded power cord, you shouldn't have to worry about fire or electrocution.
A fan speed control switch selects among different motor windings, but a 2-speed motor can also be controlled by putting a diode in series when it's desired to cut the voltage in half. A diode rated for at least 3 amps and at least 400 volts peak inverse voltage should work fine with for this. Even though a 1/25 HP motor doesn't draw more than 1/4 amp, you want the diode to be rated much higher to withstand surges. Whether you use just a diode or a light dimmer, install a fuse ahead of it that's rated for no more than the maximum amp rating of the dimmer or diode.
|10-05-2012 04:17 PM|
|zzyzzx||OK, would you be OK with a better branded one?|
|10-05-2012 03:58 PM|
|10-05-2012 08:44 AM|
Depends upon the rating of the dimmer. Something like this would probably work:
Router Speed Control
|10-05-2012 06:11 AM|
|Brattles||They all look the same to me, those things that go in the wall box, but I'll do that.|
|10-04-2012 09:34 PM|
Use a rheostat for a ceiling fan like you can find at the hardware store. DON'T use one for lights. Make sure it is good for at least 120VA (volt amps). Should run you about $25-$35.
|10-04-2012 05:56 PM|
|10-04-2012 05:31 PM|
|10-04-2012 05:25 PM|
What should I use to slow down a motor?
0.7 amps at 115 volts or 80 watts.
|10-04-2012 05:05 PM|
|Frogstar||A potentiometer is like a rheostat.|
|10-04-2012 04:52 PM|
|Dr. J||yes but uhh.... not sure I'd use a light dimmer to slow a motor. I think the worst that would happen is you'd burn up the dimmer. Or start a fire.|
|10-04-2012 04:48 PM|
Is a 120 volt AC potentiometer the same as a cheap light dimmer?
I want to slow a 1/25 HP 120VAC motor, and the manufacturer says I should use a potentiometer but it's not clear just what that is.
Will an inexpensive light rotary light dimmer switch do it, and is that the same as a fan control speed switch?
What should I use to slow down a motor?