LumberJocks

Electric Motor Wiring Speculation

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by DMiller posted 08-21-2018 02:14 AM 452 views 0 times favorited 7 replies Add to Favorites Watch
View DMiller's profile

DMiller

419 posts in 644 days


08-21-2018 02:14 AM

Topic tags/keywords: question electrical 220v 110v motor

Today I took the electric motor out of our old dryer that quit; however, the motor is wired for 220v and not 110v. I’m not certain that the motor even works. I noticed on the motor that there are two red (+) wires going into the motor, along with one black (-), one green (ground), and several other wires. I was reading on https://forum.allaboutcircuits.com/threads/2-hots-no-ground-explain-this.1007/
where a guy was able to run a heater off two positives and no ground.

What would happen if you took separate positive wires from a different breaker and connected a positive wire to either side of the motor, along with running a ground to each outlet? Would this create a form of 220v power? Or if you did the same thing with two car batteries, but connected the ground to a safe grounding area? This is all speculation; I have no plans of doing anything with it until I know 100% that it is safe.

Hopefully this diagram gives you a better idea of the question I am asking:

A picture of the motor:

Again, this is all speculation and I will proceed no further until I know what I am doing is entirely safe. Thank you for your help, it is appreciated!

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."


7 replies so far

View MrUnix's profile (online now)

MrUnix

7001 posts in 2370 days


#1 posted 08-21-2018 02:42 AM

Can you post a closeup picture of the label? If that was out of a dryer, then the two red wires are most likely part of the heating element circuitry and switched using a dual contact centrifugal switch. If you google for whirlpool dryer wiring diagram, you will get an idea of what gets hooked up where – they are all pretty similar as is the color coding of the wiring. Blue wire is typically the power lead for the motor, and it should be 120vac only.

Cheers,
Brad

PS: That is an A/C motor – so there are no positive (+) or negative (-) connections.

-- Brad in FL - In Dog I trust... everything else is questionable

View dhazelton's profile

dhazelton

2789 posts in 2468 days


#2 posted 08-21-2018 10:45 AM

Usually an electric dryer runs the motor off one 110 leg and the heating element off both legs to make the heat required, so you should be able to run the motor just off a 110 circuit (115, 120 whatever you want to call it). If you have the dyer the wiring diagram is usually printed on a paper somewhere on the back panel, inside or out.

View theart's profile

theart

54 posts in 726 days


#3 posted 08-21-2018 12:48 PM


PS: That is an A/C motor – so there are no positive (+) or negative (-) connections.

It’s AC, but it’s polarized, so there are hot and neutral connections. The motor should have two hot connections and possibly two neutrals, one for the main coil and one for the start coil. The start coil is energized first to get the motor spinning in the right direction, then shut off by either an internal centrifugal switch or an external relay. If you just energize the main coil, the motor will only start running if you give it a push.

View DMiller's profile

DMiller

419 posts in 644 days


#4 posted 08-21-2018 02:09 PM

Thank you all for the help and information! Brad, I will try to get a picture as soon as can. Thank you for the clarification on + and – connections, I forgot about that. Dhazelton, that makes a lot more sense. I was wondering why a 1/3 hp motor would run off 220v! Theart, thank your for the information, it is appreciated!

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

View DMiller's profile

DMiller

419 posts in 644 days


#5 posted 08-21-2018 09:56 PM

-- Dale Miller Modesto, CA "I can do all things through Christ, which strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

View JimYoung's profile

JimYoung

296 posts in 1758 days


#6 posted 08-21-2018 10:53 PM

That motor is 115V / 60 Hz (115/60) and draws 5.9A under load.

-- -Jim, "Nothing says poor craftsmanship more than wrinkles in your duck tape"

View MrUnix's profile (online now)

MrUnix

7001 posts in 2370 days


#7 posted 08-22-2018 08:04 AM

That seems to be a pretty common motor that is known by a zillion part numbers and used in dozens of manufacturers machines… so an application specific schematic is hard to nail down. However, a generic one works pretty well, such as this one:

Notice that the motor itself is hooked up right after the broken belt switch, fed by the blue wires coming off the thermal fuse (120vac)... other side is connected to, eventually, the white neutral line after going through the centrifugal switch (and disabled by the door switch when open). Colors on your motor may not be identical, but should be close.

BTW: You can use the extra contact on the centrifugal (where the two red wires are for the heater) to switch another device – the switch will only be closed when the motor is up to speed.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com