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Forum topic by Shahidan posted 04-07-2014 01:39 PM 747 views 0 times favorited 11 replies Add to Favorites Watch
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Shahidan

12 posts in 275 days


04-07-2014 01:39 PM

I wanted to use this electric motor (240v ac) to make a disc sander.

There are four wires coming out of the motor: white,red,yellow,blue and black, I hope somwone wil be able to tell me how to wire it up.

Thank you.

shahidan


11 replies so far

View WhyMe's profile

WhyMe

172 posts in 315 days


#1 posted 04-07-2014 02:49 PM

Hard to say without the motor brand or what it came off of. 2 wires are probably for a capacitor and a different combination of the 3 other wires for rotation direction. I know that doesn’t help.

View Jimbo4's profile

Jimbo4

1183 posts in 1517 days


#2 posted 04-07-2014 04:14 PM

What is the rotational speed ? It shouldn’t be more than 1750 for a disc sander.

-- *Arachnoleptic Fit*: The frantic dance performed just after you've accidently walked through a spider web.

View bigblockyeti's profile

bigblockyeti

1813 posts in 475 days


#3 posted 04-07-2014 04:16 PM

Even if you have a make and model number that could go a long way toward someone being able to help you.

View Shahidan's profile

Shahidan

12 posts in 275 days


#4 posted 04-08-2014 03:34 AM

The motor was from an air conditioner blower unit.
Made in China.
Voltage 220vac Series: 4
Power 13W
Current : 0.21 amp
Capacitor: 1uF 450V

No speed indicated

Below is the circuit diagram.

Thanks to all.

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Shahidan

12 posts in 275 days


#5 posted 04-09-2014 04:12 AM

I managed to get the motor working.

The unknown component was a thermistor but i removed it

The starting capacitor, 2 uF 400 vac, was connected across the white and red wires. The 230vac line was connected to the ends of the white and red wires.
The motor spin when power was switched on.I did not test the yellow and blue wires. As WhyMe said it could be for different speeds,

Now I could go ahead with what I had intended to do

Shahidan

View bigblockyeti's profile

bigblockyeti

1813 posts in 475 days


#6 posted 04-09-2014 04:22 AM

I’ve played around with these a little, I suspect the black, blue and red are your different speeds, or more accurately different torques. Much like a ceiling fan motor or an air handler blower motor, they can spin at full speed with no load, the speed is reduced only when the load is applied. To check which speed (or torque) each of the wires represents, you could try all of them, the one that accelerates the rotor the slowest would be your slow speed and so on and so forth.

View Shahidan's profile

Shahidan

12 posts in 275 days


#7 posted 04-09-2014 01:53 PM

I could try that tomorrow. I hope the circuit breaker would not trip.

View bigblockyeti's profile

bigblockyeti

1813 posts in 475 days


#8 posted 04-09-2014 02:00 PM

I doubt it would, these motors are generally designed to be very efficient, and don’t spin too fast so if it provides adequate torque it wouldn’t be too fast for a disc sander.

View Rick M.'s profile

Rick M.

4518 posts in 1134 days


#9 posted 04-09-2014 03:51 PM

On my smaller hvac motors, red is low speed, blue is high; and they spin at slower speeds with our without load but of course yours may be different.

-- http://thewoodknack.blogspot.com/

View dhazelton's profile

dhazelton

1290 posts in 1051 days


#10 posted 04-09-2014 03:55 PM

I think motors designed for furnace use are best repurposed as some type of air handler or air filtration unit. You might consider that by building a box and using a decent furnace filter to clean your air.

View Shahidan's profile

Shahidan

12 posts in 275 days


#11 posted 04-10-2014 05:05 AM

Thanks a lot,everybody for all you help and suggestions.

bigblockyeti : I was a bit apprehensive but the circuit breaker did not trip.
Rick M: In my case white gave the fastest speed. Bl ue medium speed and red needed a slight manual spin to run.It also gave the slowest speed.

dhazelton: I am an avid collector of all sorts of motors and I dreamed a lot about using them ! You gave me a good idea. In my small workshop I used an air conditioner compressor fan to cool the work area.

Thank you .

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