Electric motor experts
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Topic: Electric motor experts
Posted By: Thad in AR.
Subject: Electric motor experts
Date Posted: 17 Dec 2018 at 6:42am
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I have a project that requires a 1 hp electric motor. I have one I found in my messy shop. I was going to scrap it because it has a lot of wires. I assumed 3 phase. After a close read on the tag it’s a single phase 120 or 240 v . It’s the proper 1725 Rpm. The tag says Dayton hazzardous area motor. It has no capacitor that I can see. Is the lack of a capacitor a problem? It starts with no load on this project. I have another that is a face mount pump motor that would take more fab work to mount but it has a start and a run capacitor. |
Replies:
Posted By: DMiller
Date Posted: 17 Dec 2018 at 6:50am
| Will need to do some research as to who made it or what it came off of as most likely due to a 'Lot of wires' was capacitor start. Capacitor start sets up rotational direction in most cases by applying a direction feed to kick the motor, without that the motor may just stall and overheat bumping F/R but not rotating. |
Posted By: jaybmiller
Date Posted: 17 Dec 2018 at 6:50am
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Not all motors are 'capacitor-start-run' types ! so I'd say you're OK. Hazardous probably means it's 'totally enclosed' and won't send a spark outside to ignite 'fumes'. It'll have an internal fan to keep it cool. I have one 'somewhere' I used on a soil sifter 20yr ago...no dirt got INTO the motor. C-face motor typically used with gearboxes or pool pumps. I fabbed up an adapter plate once from 1.5" angle to form a a square 'faceplate', took couple hours.... hope this helps Jay ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: Thad in AR.
Date Posted: 17 Dec 2018 at 7:45am
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All those wires are either for high or low voltage. I already plugged it in and it runs perfect. I wonder if it may have a capacitor under the tail end cap? I guess I have nothing to lose in trying it? |
Posted By: nella(Pa)
Date Posted: 17 Dec 2018 at 8:15am
| The correct wires must be tied together for the 120 or 240 voltage. The motor can still run if they aren't, but won't have the power or burn out. If there is no wiring digram or if the wire aren't marked a good election or motor repairman can tell you which leads need to be tied together and which ones for the leads. |
Posted By: jaybmiller
Date Posted: 17 Dec 2018 at 9:01am
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Usually there's a wiring diagram on the inside of the 'wire access' cover. It will show how to hookup for 120 or 240, fwd or rev AND if there's a cap or 2 . As I said , not all motors have/need caps to run.... those that do will have 1 or 2 'bump out' covers underneath live the caps. If there's no diagram, just google the make/model info of the motor....it's on the 'web' somwhere... Jay ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: Thad in AR.
Date Posted: 17 Dec 2018 at 9:08am
| Wiring all intact tag is there and like I said the motor runs perfect. I’m just wondering if it has a hidden capacitor or not and if it will have the power of a capacitor start motor even though it won’t start under a load? Sorry for the confusion. |
Posted By: Brian Jasper co. Ia
Date Posted: 17 Dec 2018 at 9:20am
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Sounds like a good question for an electrician ------------- "Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford |
Posted By: LouSWPA
Date Posted: 17 Dec 2018 at 9:39am
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Im not an expert on electric motors, but how did you determine which wires to connect to get it to run? Is it possible that this motor was designed to be powered via external control system? With so many wires I am GUESSING that it is designed for multiple speeds or multiple loads, or multiple supply voltages, or some combination thereof. If it requires an external control system, that is where your capacitors would be. Jay is right not all AC motors use caps, but generally speaking I don't think those not using caps produce much torque ------------- I am still confident of this; I will see the goodness of the Lord in the land of the living. Wait for the Lord; be strong and take heart and wait for the Lord. Ps 27 |
Posted By: Thad in AR.
Date Posted: 17 Dec 2018 at 10:19am
| Lou to has 8 wires numbered 1-8 and a green ground. 3 wires are tied together and capped and 3 wires make up the hot side then one is a neutral and one a ground. The wiring diagram is there for high and low voltage and rotation change for both. I have it wired for 120v CCR |
Posted By: desertjoe
Date Posted: 17 Dec 2018 at 10:37am
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Hey Thad,,which of the 3 "numbered" wires are capped together,,and which of the other 3 numbered wires are going to the hot.. and which of the "numbered" wires are the neutral,,,?? I have a BIG, HEAVY 1 1/2 HP motor with the 8 wires and I never could find a legend to try to run it. Was thinkin on usin it on a compressor I ain't usin.
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Posted By: Thad in AR.
Date Posted: 17 Dec 2018 at 10:39am
| Text me tonight and I’ll tell you. You want high or low voltage? What rotation? |
Posted By: desertjoe
Date Posted: 17 Dec 2018 at 10:48am
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220 voltage and CW rotation. Mine is 1750 RPM also.
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Posted By: tadams(OH)
Date Posted: 17 Dec 2018 at 12:55pm
| Thad you have it running as instructed by the wires diagram, I would use it |
Posted By: shameless dude
Date Posted: 17 Dec 2018 at 2:12pm
| o-k...whatcha building? |
Posted By: Coke-in-MN
Date Posted: 17 Dec 2018 at 6:11pm
https://electronics.stackexchange.com/questions/266793/how-does-an-induction-motor-start-when-it-has-no-capacitor-or-inductor" rel="nofollow - https://electronics.stackexchange.com/questions/266793/how-does-an-induction-motor-start-when-it-has-no-capacitor-or-inductor" rel="nofollow -
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Posted By: Coke-in-MN
Date Posted: 17 Dec 2018 at 6:13pm
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Repulsion / Induction motors - low starting torque needed - no internal switch for capacitor start and no capcitor needed to run . Used in fans - and other such uses ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: DiyDave
Date Posted: 17 Dec 2018 at 6:15pm
Sounds like a normal dual voltage wired motor, to me. Once you wire it correctly, should be good to go, USE IT!
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Posted By: steve(ill)
Date Posted: 17 Dec 2018 at 6:29pm
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YEP.......... the 8 wires are typical of multi voltage, reversible motors.. You pick the rotation and 120 or 240 volts and then connect the wires to get that result. Capacitor not needed on many motors.......... your good to go. ------------- Like them all, but love the "B"s. |
Posted By: DMiller
Date Posted: 17 Dec 2018 at 6:35pm
| Have done little with electric motors, just a few motor change outs over the years. Know a farm that has a Cap Start/run motor on a grain auger, the Run Cap is trashed and they do not want to buy one so the motor runs HOT as a forest fire all the time. In the Power Plant most all the pumps and equipment were 480 or 208 three phase, very little 240 or 120 single phase so had full staff of electricians to work them and keep them rotating the right way. |
Posted By: steve(ill)
Date Posted: 17 Dec 2018 at 6:52pm
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these are the numbers on the wires and how to connect on "MOST" motors http://apps.motorboss.com/connections/904983.pdf" rel="nofollow - http://apps.motorboss.com/connections/904983.pdf ------------- Like them all, but love the "B"s. |
Posted By: JoeO(CMO)
Date Posted: 18 Dec 2018 at 10:43am
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Look on the Tag affixed to motor. Do you see anything referring to Capacitor Start or Capacitor Run. It may have centrifugal switch internally Hazard area motors are most likely a fully enclosed motor and may have a remotely attached capacitor. Look on the tag---"MFD" field on tag will tell story What did this motor come off of??
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Posted By: HD6GTOM
Date Posted: 18 Dec 2018 at 6:34pm
| If there is no tag on the motor, a trip with the motor to your friendly electric motor rebuild shop usually solves the problem. The boys there point out which wires to hook together for 120/240/rotation. At least that is the case at the shop I use in Creston Iowa. Good luck with her. |