I'm hoping someone(s) can take the time to help me out a bit on this.
First background. I rent a aircraft hangar from a county and the original motor gearbox assembly was starting to really struggle to lift the door open. The county hired an electrician to replace the motor/gearbox assy. Well long story short, 3 months later and several iterations, the door still doesn't work. Yep, these boys aren't very competent.
So I took the old assy home and now it is in some pieces on my workbench. Confession - I am not knowledgable of electric motors - well I know some of the basics, but that is it. This assy is OLD, probably dates back to the Korean war. Back when it was mounted in the hangar, one of the brush leads was no longer attached to its brush, it was just laying on the brush holder.
Now some details. The data tag says the motor was built by Master Electric Co in Dayton, OH. Style - 123700, Type - RA, Frame - 5825. It is a 1/3 hp, 115v, 60 hz motor. It has an electric brake assy on the back of the motor which has been disabled. This motor is integrated with a Winsmith Speed Reducer right angle drive. The gear box has a bad lubricant leak. The data tag on the gear box is severely damaged. I cannot read the part or reduction numbers on the data tag.
Since I have my doubts that these so called electricians are ever going to get their stuff working, what I would like to do is replace the motor brushes and bearings and the bad gearbox seal. If by the time I get this motor back together and the boys still haven't got their stuff going, we will put the original repaired unit back in. I haven't pulled the motor armature out of the gearbox yet, so I don't know if there is a seal part number that I can use to order a seal. The one bearing I have exposed has a visible part number, but I have not tried to look it up. I'm reasonable certain I'll have to have somebody custom build a brush set. I did some searching, but couldn't find anyone selling the type of brush configuration that this motor is using.
From what little research I've done, I think the motor is a single phase repulsion motor? I don't know how this type of motor works. I see that the line current coming in only goes to the stator windings. What confuses me is the brush setup. The four brushes are wired in pairs and the brush holders are mounted to a common metal plate which in turn sits in a recess in the back of the motor housing. It certainly looks to me like the brushes, mount plate and motor case are all electrically common.
Thanks for reading and if anyone can help out explaining how this beast works - I'd greatly appreciate it. I don't want to turn this into a big project. I would just like to understand the operational basics, obtain the proper parts and put it all back together without letting the smoke out.
Thanks all,
Lowell
First background. I rent a aircraft hangar from a county and the original motor gearbox assembly was starting to really struggle to lift the door open. The county hired an electrician to replace the motor/gearbox assy. Well long story short, 3 months later and several iterations, the door still doesn't work. Yep, these boys aren't very competent.
So I took the old assy home and now it is in some pieces on my workbench. Confession - I am not knowledgable of electric motors - well I know some of the basics, but that is it. This assy is OLD, probably dates back to the Korean war. Back when it was mounted in the hangar, one of the brush leads was no longer attached to its brush, it was just laying on the brush holder.
Now some details. The data tag says the motor was built by Master Electric Co in Dayton, OH. Style - 123700, Type - RA, Frame - 5825. It is a 1/3 hp, 115v, 60 hz motor. It has an electric brake assy on the back of the motor which has been disabled. This motor is integrated with a Winsmith Speed Reducer right angle drive. The gear box has a bad lubricant leak. The data tag on the gear box is severely damaged. I cannot read the part or reduction numbers on the data tag.
Since I have my doubts that these so called electricians are ever going to get their stuff working, what I would like to do is replace the motor brushes and bearings and the bad gearbox seal. If by the time I get this motor back together and the boys still haven't got their stuff going, we will put the original repaired unit back in. I haven't pulled the motor armature out of the gearbox yet, so I don't know if there is a seal part number that I can use to order a seal. The one bearing I have exposed has a visible part number, but I have not tried to look it up. I'm reasonable certain I'll have to have somebody custom build a brush set. I did some searching, but couldn't find anyone selling the type of brush configuration that this motor is using.
From what little research I've done, I think the motor is a single phase repulsion motor? I don't know how this type of motor works. I see that the line current coming in only goes to the stator windings. What confuses me is the brush setup. The four brushes are wired in pairs and the brush holders are mounted to a common metal plate which in turn sits in a recess in the back of the motor housing. It certainly looks to me like the brushes, mount plate and motor case are all electrically common.
Thanks for reading and if anyone can help out explaining how this beast works - I'd greatly appreciate it. I don't want to turn this into a big project. I would just like to understand the operational basics, obtain the proper parts and put it all back together without letting the smoke out.
Thanks all,
Lowell