Help replacing a small DC motor

Help & Support Robot Parts
1

I am looking to source a specific mini DC motor for a paper collator tower. I have removed the motor—all of the information I have about it, which is also on the picture, is:

DC Motor

Type SP

No. FM-36E

China | Fuji Micro

(and on the other side, a sort of serial(?) number: ID24 JSP)

measurements:

  • body: 1.5 in diameter, 2 in. length

  • spindle: 5/32 in. diameter, 1 in length

I am not much of an electronics person, so any help would be greatly appreciated!

1 Like
3

Hi @ryancparadiso and welcome to our forum!

It is very hard to find good replacement without the datasheet of the motor. This looks like a 775 motor but we don’t know if it is 6VDC, 12VDC, 24VDC etc. and also we don’t know the RPMs.

RobotShop has some 775 motors:

Also, a lot can be found on AliExpress.

4

Thank you! I’m learning a lot, did some more digging in the technical manual and schematics and found that it’s 24v, 0.46 A, which I’m led to understand means 11 watts. I’m not sure the rpms, but it’s not ‘super fast’—it controls rollers for feeding paper through binding equipment.

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5

Hi @ryancparadiso ,

RobotShop has this one 775 motor, 24VDC nominal voltage, no load current 0.45A:

But RPMs are not low. No-load speed : 8300 RPM

6

Ah, this looks very close!

What would happen if I installed this motor, knowing that it is rated for higher RPMs? I imagine the system would simply just spin faster? Or would it be naturally limited by the PCB or gear system in some way?

Also, I’m noticing that the motor you posted here has a shorter shaft than the motor I’m trying to replace. Is this something that is possible to switch out? Or is it likely that the manufacturer has a long spindle version?

Thank you so so much for your help!

1 Like
7

That is a good question, but I am not sure if we can know what would happen until you try this motor.

There are high chances it will not work properly if the RPMs are very different. Hopefully, it will not damage anything, but not impossible for this to happen.

Not sure how much this shaft is shorter. If it cannot be installed, you would have to find another motor.