I got these monstrous 30v motors from CKoehler in a trade a while back:
http://i101.photobucket.com/albums/m51/Italian_guy299/000_0001-2.jpg
The motors were made in holland and the gearbox was made in Sweden. They look like they are pump motors, not exactly sure. I did a search on google and came up with nothing.
My question is: how much torque do you think they may have? They are 30v motors. I ran them off a 9v 1.2amp wallwart since i don’t have anything close to 30v and they were very hard to stop by hand - even at that voltage. I’d like to build a 2WD rover with them which would weigh 20-30 lbs and be able to climb with tracks angled upwards in the front. Think these monsters could do it?
BTW I would be running them at their spec 30v’s.
“how much torque do you think they may have?”
Insufficient info to even make a guess. I’d stay away from designing a project around odd-ball motors unless absolutely necessary.
I assumed someone would be able to estimate by the size of the gearbox.
They are very powerful from the tests I have done, and I would hate for them to go to waste and buy something like drill motors when I have something more powerful lying around. From the tests Ive done I get roughly 55 RMP at 9vdc from my wallwart. So I assume if I triple the voltage (27v) which is X3 I get 165 RPM. I did a second test to try and stop the motor with my hand while running and its difficult but I did manage to slow it down and almost stop.
I think they would work good, I just wanted to know if anyone could tell for sure by the images or if they knew the brand or type of motor.
I would say these look like medical fluid pumps. There is no way of guessing how much torque they have. There are 36V motors that you can stop with your hand easily. And some 12V ones that you could never stop.
You’re best bet would be to clamp it down and install a bar or rod on the end, like a propeller. Cut the rod so it is 4 inches long from center and have the end resting on a scale on your bench. Zero the scale and hook up power. Not long, just for a second. You’ll be stalling it and it will draw alot of current so be quick. Try to get a weight reading on the scale at stall. Then multiply that oz. value by 4. You have oz/in of torque.
Very rough but it will give you an idea. You can use other methods as well.
Try mounting some wheels to them, the size of your sprockets and mount them on aboard. Then hook them up to an ESC and try it out. See how much power they have.
Really there is no way of knowing for sure unless you do real torque testing. And the voltage and size of the gearbox make little to no difference. One indicator of a strong motor is it’s weight. Weak motors have minimal windings and small magnets, making them light. Very strong motors have heavy windings and big magnets. This is very rough as well but can still give you an idea. You can always take the gearbox apart and count it’s ratio as well. If it’s a 100:1 ratio or over, even a weak motor can be pretty powerful.
I do have to agree that building around a pair of unknown motors can be a let down. If you do, find an alternative motor that you would use instead, take it’s dimensions and be sure to build your design so that if the motors you have don’t workout, you can always install an alternative motor.
The gearbox actually says 20:1 in VERY VERY small writing, almost impossible to see, had to find a magnifying glass, but its deffinately says 20:1. I checked the motor and it has a very big magnet on the inside past the gears.
Im not going to build any robot around these motors. But I do want to continue with tests to see what these things can do. They look really good and are still probably more powerful than any other motor I own.
that being said, pumps have to be pretty strong to deliver a good amount of fluid per min (L/min ect). And Ckoehler said they were decent too. Thanks for the help anyways.
-regards
Post the numbers off it on here. I can’t read all them in the picture.
I have a pretty extensive database of motors from all over the world, I might have some specs on them. Often the product number on a motor used in a retail product or automobile, will be different than the manufacturer serial number. I have most of the product reference numbers with their manufacturer number counterparts since I have used motors that are normally sold for digital mill tables, as wrist rotate motors.
The motors are: Philips, 9904, 120 13311, 30VDC, 21.97 MADE IN HOLLAND
The Gearbox’s are: ALiTEA AB, 20:1, Batch # 11627, MADE IN SWEDEN.
just for a little more detail, the motor also has an external shaft for decoding rotation on the back of it.
Your motors are made for Watson-Marlow peristaltic line/hose pumps.
You still have the fluid rotors attached but are missing the pump box for them. The encoder is for the variable control models that allow the user to specify the flow rate.
It comes out of a hose pump that is long discontinued.
Specs for the motor from Philip’s is:
24V/36V
6000rpm
26.5 oz/in torque
65A stall
With a 20:1 box, that gives you:
300 rpm
530 oz/in
That’s no load too.
= 38.16 kg/cm
Thats pretty impressive than. Its a little more than double the torque of the strongest gearhead motor lynx sells.
Also, impressed how you found the specs. Nicely done 8)
Thanks Evo!
EDIT: hmm, they’re pretty powerful but 530 oz/inch dosent seem worth it if the motors need 30v… I could probably get better with cheap 20$ drill motors (geussing).
Yup.
Plus a 65 A stall current at 30V is alot of power. Enough you could potentially shock yourself pretty good.
Doesn’t really seem worth the power for 500+oz/in. At 85A stall on 12V you can pull 8000oz/in out of a 550 can motor. And around 100rpm geared in the 1:200 range…
Which is what most cheap drill motors are.
