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Jeannin 5 HP Single Phase Motor

Maui

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Joined
Sep 16, 2012
Messages
2,893
Location
Upstate NY
I just picked up this motor over the weekend. It was made by Jeannin, a company that originated in Ohio in the early 1900s. You can read a short history about the company here:

http://vintagemachinery.org/mfgindex/detail.aspx?id=3318

Apparently this was the largest motor that they made, and the photo really doesn't do it justice in terms of its actual size. It is a monster. No matter what I do the motor tag comes out upside down in this posting. I don't know why. The motor is bolted onto a skid and the seller and I dragged it to the rear of my trailer. We lifted the long end of the skid rails up so they were resting against the lip of the trailer. Sitting at that angle of about 50 degrees the seller and I used the two 2x4s I brought as levers to lift the other end of the skid up high enough to where I held it in position while he pushed the motor onto the trailer. When I lifted the end of the skid up by myself to see how heavy it was my best estimate is that it weighs around 350 lbs.

I have a video of it running, but can't upload it because the file is too big. You can see the electric cord that was hooked up to it in the photo. I can't believe the cord didn't fry itself when it was plugged in. But it worked well enough to get the motor running. It spit and sputtered a little, so I will have to take it apart and clean everything up. And for this one I'll probably paint the bell ends and the rest of the housing, and even clean up the ID plate. This thing has a LOT of copper wire in it. They don't build them like this anymore.


Maui
 

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Packard V8

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Mar 16, 2009
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7,380
Location
Spokane, WA
Repulsion-start induction-run were used where high starting torque was required. They started as repulsion motors, but once running at a sizable fraction of full speed, the brushes were lifted mechanically and all commutator bars were short-circuited together to create the equivalent of a squirrel-cage induction motor. These great old R/I motors have several advantages, but cost too much to make today.

jack vines
 
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Maui

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Sep 16, 2012
Messages
2,893
Location
Upstate NY
Jack, I told the seller that I can probably still find replacement brushes that will fit this motor. I hope I was right.

Movover, I wouldn't be surprised if this is a continuous duty motor. According to the ID plate it's rated for 50 amps at 110 volts, or 25 amps at 220 volts.

Maui
 
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American Locomotive

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Jan 8, 2017
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10,989
Location
Rhode Island
Not too often you find 5HP 120v motors these days.

Keep the commutator and brushes clean on those motors. You'll want to make sure the commutator shorting mechanism moves freely, and that the brush lifting (if equipped) mechanism isn't sticky.
 

marinusdees

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Joined
Oct 30, 2012
Messages
1,325
Location
Edgewood, Washington
You can find brushes. I found some from some place in CA, seems to me, several years ago. Chances are, this is a motor with bushings, not bearings. Make sure the bushings are not egged out, so the rotor will run correctly. If you can turn the rotor without it dragging on the iron, you are OK. Buy a new set of brushes and see how it goes. If the iron drags on the rotor, take it to a motor shop . And listen!!!
 
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