15 replies to this topic

[bob.aerofun]

I’m looking for a GE 3ADM 12V motor. I found a GE 3ADM4 from Professor Motor (it looks the same) but it runs too fast for my application (not a slot car). I think the 3ADM motor might turn about 1,000 RPM and draw 3 amps under load. The motor is about 1.25" long and 1" in diameter. It has a 3/32" diameter shaft. I'm interested in a 3ADM in any condition but preferably still running. I'm attaching a picture of the motor I'm trying to replace.

 

Also, let me know if you have a lead on who I might contact to pursue getting one of these motors. Or is there somebody that could help me rewind my 3ADM4 to operate in my system (like a 3ADM).  

 

I've seen old posts from slot car enthusiasts saying they bought 3ADM motors and they were too slow. It just seems like there has to be a 3ADM on somebody's shelf or in a drawer.  

 

I am also interested in a very similar motor that could be end-mounted to the gear box I have. 

 

Thanks for the help,

 

Bob

bob.aerofun@gmail.com

(360) 901-3060 Pacific Time

 

[JohnnySlotcar]

I have a NOS one and also lots of parts and used ones.

[Lone Wolf]

Bob, the motor you show is a high performance motor made specifically for slot cars. I believe the 3ADM was made for electric toothbrushes and such.

 

Why not turn down the voltage somehow to reduce the speed? Just a suggestion.

[don.siegel]

Bob, 
 
Take a look at this THREAD.
 
Lots of germane info in there! 
 
You might try to contact Gary (Horsepower) to see if he has any left. 
 
I only have one of the "industrial" models, which are not quite the same as the Dynamic version, and it barely turns over on 7 volts; I also have four others with different color plastic, but those turn a lot faster than 1,000 RPM! 
 
We have to assume that GE made a bunch of these motors in different versions, with windings and/or mountings depending on the application. Same for many other motor manufacturers, from Mabuchi to Globe... 
 
Don

[Samiam]

If all else fails maybe John Havlicek can rewind what you have.

[bob.aerofun]

I'm new to the forum. How to I reply to individuals?  JohnnySlotCar: I'd like to talk to you and buy used 3ADM and parts.  Please call 360-901-3060 PDT. Bob

[don.siegel]

Bob,

 

Click on the member's name and you'll see a small window including a "send message" option, better known as a personal message, or pm.

 

Don

[gluebomb]

Hey Bob, pretty sure you'd be able to trade the one you have for a slower model if anyone here has one sitting - we like the fast one's mostly.

Also, is your application that helicopter game that gets referenced once in while when these motors are mentioned ? If so, you'd maybe be able to substitute something contemporary if you have some idea of the performance specs of the original motor.

 

Not to threadjack, but did anyone else here pick up one of the related GE 3ADM motors that were up on auction recently ? Slightly longer with a less user friendly black plastic endbell, same mags, can, and shunted brushes though - these actually scream on 12 Volts, unlike the disapointing but visually identical motors that pop up once in a while.

Think they may have also been used for power windows as seller sold mostly auto keys and lock hardware otherwise...

[don.siegel]

I didn't get the recent ones, but must have got a few of these earlier - if I remember right (I'm at office), they're double shafted, with flats on either end...

 

Don

[JohnnySlotcar]

Found a nos 3ADM. Black case with clear endbell. Has a flatted shaft on the can side. Also has stamping: 5B16A1 75 50 on the can in ink. Yours for the shipping! Johnny

[gluebomb]

I didn't get the recent ones, but must have got a few of these earlier - if I remember right (I'm at office), they're double shafted, with flats on either end...

 

Don

 

 

hmm, the few i picked up weren't double shafted but do have a flat - did you power yours up ? pretty pepppy...

[don.siegel]

Nope, you're right. It's the slow one with the white endplates that has the double shaft. The ones with the black endplates only have a single shaft, opposite the brushes, and yes, they're pretty peppy! 

 

Don 

[JohnnySlotcar]

19,000 rpm at 6 volts on the dyno!!!

[bob.aerofun]

The GE 3ADM 12V motor I want to replace is in a gear motor set.  The spec on the set says 60 RPM output at either 0.3 amp or 3 amp (hard to read), I assume under load.  I took the gearbox apart and calculated a overall ratio of 35:1 so I estimate the motor is turning 2,100 RPM under load.

 

I'm attaching a picture of the motor I removed from the gearbox. 

 

I really appreciate the help.  I'm using the gear motor in my homebuilt airplane to drive the elevator trim tab.

 

Bob 

 

Attached Images

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[bob.aerofun]

 

 

hmm, the few i picked up weren't double shafted but do have a flat - did you power yours up ? pretty pepppy...

Do you have a 3ADM that you want to sell?  It can be in any condition.

Bob 360-901-3060

[bob.aerofun]

Found a nos 3ADM. Black case with clear endbell. Has a flatted shaft on the can side. Also has stamping: 5B16A1 75 50 on the can in ink. Yours for the shipping! Johnny

Did you ever find a 3ADM that you will part with?

Bob 360-901-3060