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It could possibly be that the run winding is somehow not in the circuit. When the motor is first applied with power, the electrolytic capacitor (the one that was bad and replaced), the stationary switch (white looking device in the center of the video), and the start winding are in the circuit...

Could there be a possibility that when the motor was repaired the third time that maybe the air baffels (if there are any) were left out? Or as stated above the cooling system ineficient.

As far as grease goes you might look for mixing of incompatible grease... I have seen it cause bearing failures bad enough that it caused the inner race to spin on the motor shaft and was so bad the it bent the shaft. It too was on a 3600 Rpm motor. 300 Hp.

On your 14 Jul 10 1:59 post the picture that was posted shows a terminal board on the motor. The white lead terminates on the right. The board reads "LINE". One of your LINE's goes here. The orange lead terminates on the left. The board reads "LINE". The other LINE goes here.

If you are wanting to try and run the motor, the line's are clearly marked. White and orange. As to what the black lead does, It doesn't look like it is coming directly off the switch( normally open then closes when motor is running to maybe start some type of heat source, as suggested above)...

Should be four leads coming out of the motor. Two are the shunt field leads, Two are the armature leads that connected to the brush holder. From the one's I've seen in the past the Red leads are the shunt leads, the black leads are the armature(brush holder) leads. See the picture...it might...

pic 4http://files.engineering.com/getfile.aspx?folder=f1450d2d-0162-4465-9edf-eaf83e5bf05c&file=brush4.jpg

pic 2http://files.engineering.com/getfile.aspx?folder=61f16958-afbc-4c04-972e-8d9820f8ce49&file=brush2.jpg

I need some help in locating a brush for an old flour bleacher. I was wondering if anyone has ever seen one or has any idea where to get one made??? Check the pictures Thanks!!!

You might try and find a motor repair shop locally. It is a possibility they may have some old parts. It's worth a shot.

I really appreciate all the replies. It is strickly a repulsion motor. NO shortcircuiting device. It never had one. It's not brush lifting either. I guess when I say it was burn up.... I mean they let all the smoke out. Winding was melted, but not to the point as to where it may have melted...

There is the catch. The stator and armature were both burned up so we rewound them. It is more of a sentimental piece, but an opperational one.

I am wondering if there is anyone out there that knows about an old repulsion motors? Having problems with pulling a little more than 2.5x nameplate amps at no load. I know and realize that the motor speed can reach a very high rate with no load, but this is a siren so trying figure this out...

I would check and make sure that the starting winding is not open. It sound as if that may be your trouble. If the starting winding is not burn up, then investigate the thermal overload, as waross suggested April 23, or look for a broken wire in starting winding circuit. I never saw on the post...

Zlatkodo, Here is some info on interspersed windings. This should explain "interspered" better than i can. Flandraxhttp://files.engineering.com/getfile.aspx?folder=6b2d40bf-960b-48d2-af84-a99eba21bf4b&file=interspersed.pdf

Along with Muthu I too have only seen 60 slot in that horsepower range. Most 2 pole 60 slot GE that I've seen are interspersed. All the GE's I've seen have a pitch of 21. I've also seen a Siemens 60 slot with a pitch of 14. Don't know if this helps.

I have seen and repaired motors with leads up to 15 feet. The motors where designed that way. I have a customer wants to make the leads on his motor 30 feet. I was wanting to know if the NEC does govern this? What kind of problems exist? Will i have to up size the wire? So on.

I was wondering if there was a limitation to how long leads could be on a motor? Can they be run in conduit? Are there any standards for this? Thanks in advance,

Baldor/Reliance makes a wide range of motors. I would try them. What are your reasons for a DC motor??? Your looking at a rather expensive motor. Probably on the $2,500-$3,000 range. This motor here might will work if your not limited to the over-all length...

I don't feel that you have a ventilation problem. Correct me if I'm wrong, but the Klixon overload is located on the side of a large terminal box. If a ventilation problem was causing the Klixon trip, the motor case would have to transfer heat to the terminal box and so on....In my opinion the...