Electronics > Repair

How to unfix this fan from the shaft of this DC motor?

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saaluc:
Dear users of EEVblog Forum

The DC motor you can see in the attached pictures, is not working; I connected different voltages (6-24 VDC) to it but it drew no current and did not react at all. I think I have to replace it.

But the problem is that it does not come off by just pulling it out. And there is no direct access to the base of the fan, because of the plastic housing.

My questions are:
1. How these kinds of fans are fixed on the shaft of these kinds of motors? by glue, or by melting, or other methods?
2. How can this fan be unfixed from the shaft?

Ian.M:
Probably a machine press or shrink fit.  Extremely difficult to remove non-destructively and even more difficult to reattach successfully as prying it off often wallows out the hole enough it will spin on the shaft during startup acceleration if you simply push it back on and many glues are no good in a tight fitting plastic/steel interface.  Loctite and similar thread and bearing lockers *MUST* *NOT* be used as they degrade many plastics causing microcracking and brittle failure.

elektryk:
Maybe carbon brushes are worn out?

It is a bit tricky to replace them but possibile indeed.

saaluc:

--- Quote from: elektryk on December 12, 2024, 03:13:11 pm ---Maybe carbon brushes are worn out?

It is a bit tricky to replace them but possibile indeed.

--- End quote ---

Excellent idea!
Do you mean by "brushes" the things that I have encircled in red in the attached picture?

themadhippy:
did you try chucking a meter across the terminals and seeing if the windings are good? I

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