Hi everyone,
I have a question about an electric motor that I have. I actually have several of them, I acquired them years ago and am trying to figure out what they might be worth to sell them. I am not ever sure if they are ac or dc motors. The only marking on them is it says "Johnson" on the back and the number 25327626 and 3A3762 on the side of it. Does anyone know anything about this motor, and what its approximate value might be. Thank you! Noble

 

I could be wrong, but they look like typical, inexpensive, low voltage, permanent magnet, DC, brushed motors of the sort used in toys/models/small machinery.

 

If they have a specific application,
and are no longer available,
then they might be worth some money.

Otherwise, you'll waste WAY more time and money trying to sell them than they are worth.
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Welcome to AAC!

Going by what is available on Amazon, small toy DC motors sell for about $1.
What you have looks like a higher power DC motor and I see prices ranging from $10-$30.
If you don't know the operating voltage, current, and RPM then it is junk.

 

Johnson are a large Chinese based Co that sell many popular DC brushed motors for hobby use and also one of the better 2hp to 3hp ones used in TreadMills.

 

First, we need some more views so that the terminals for the power connections can be seen,and views not just broadside.
The concept of "if I don't know right now then it has no value" is rather poorly advised for those folks not wealthier than Bill Gates at his peak.

 

First, we need some more views so that the terminals for the power connections can be seen,and views not just broadside.
The concept of "if I don't know right now then it has no value" is rather poorly advised for those folks not wealthier than Bill Gates at his peak.

They are DC brushed motors and in some cases they are rated at very high RPM's, usually a search among the hobby/remote control sites for the part No. will shed light.
They can be had quite cheaply on the web.

 

Thanks for the fast feedback everyone! Here are some additional pictures. I do think they are heavier duty than small dc toy motors. Here are some additional pics of the terminals.

 

Thanks for the fast feedback everyone! Here are some additional pictures. I do think they are heavier duty than small dc toy motors. Here are some additional pics of the terminals.

Do a search for Johnson DC motors and you will see how prolific they are, they are typically 10krpm and up, very popular among the hobby & DIY crowd.
You could try advertising them on the local market place site, if you have one.
Test them on an automotive battery.

 

It should be possible to measure the resistance to get an idea as to what the voltage could be. And then apply some reasonable voltage, six volts would be a good start, and observe how fast they spin.
The terminals on the front is a bit less common, along with two mounting tabs, and a single threaded hole in the rear. They appear to be the size for a kids riding toy, which would imply that they are six volt devices.

 

It should be possible to measure the resistance to get an idea as to what the voltage could be. And then apply some reasonable voltage, six volts would be a good start, and observe how fast they spin.
The terminals on the front is a bit less common, along with two mounting tabs, and a single threaded hole in the rear. They appear to be the size for a kids riding toy, which would imply that they are six volt devices.

The resistance is not going to tell you anything about what the applied voltage should be. it is going to be a few/(couple) Ohms.
They could be 10krpm versions, or even 20krpm ver.

 

The resistance is not going to tell you anything about what the applied voltage should be. it is going to be a few/(couple) Ohms.
They could be 10krpm versions, or even 20krpm ver.

The resistance. if measured using a meter that displays low resistance, will tell me rather it is a lower voltage or a higher voltage motor, and give some hint about the power. Not a definite number, but generally the higher resistance is higher voltage.
Of course, spinning the motor at a controlled speed gives a better result.
With a thick tooth gear like that pressed on it seems that it might be made for a riding toy.

 

Co-incidentally I have two Johnson motors on the bench, one is a little larger than the OP's 12VDC 10krpm, the other is a 2hp 90vdc 3150rpm T.M. motor..
They both measure just below 10Ω with very little difference in the lowest reading between them!

 

OK, now connect a voltmeter and spin them and that 90 volt motor will give a higher voltage, And then with a low speed electric drill so they both spin at the same RPM. The 90 volt motr will show that it is a higher voltage motor.

 

OK, now connect a voltmeter and spin them and that 90 volt motor will give a higher voltage, And then with a low speed electric drill so they both spin at the same RPM. The 90 volt motr will show that it is a higher voltage motor.

It was your claim/suggestion that a resistance check would show the difference is what I had issue with, re: your post #10.

 

It was your claim/suggestion that a resistance check would show the difference is what I had issue with, re: your post #10.

He doesn't know but yet he keeps trying to tell you your wrong, typical for mrbill.

 

It was usefulon the motors that I had at the time. Obviously your results may differ.

 

It was usefulon the motors that I had at the time. Obviously your results may differ.

Which shows it is not a very useful definitive test!