Electronics > Repair

Brushes in an universal motor: opinion on their condition

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golden_labels:
I’m a newbie regarding electric motors. Worn out brushes I’ve seen previously were usually much shorter.(1) Would you consider these to be still fine?

These come from an universal motor from a cheap paper shredder. Fixing it is likely not financially reasonable, but I won’t mind learning something. :)

Also: yes, they were mounted perpendicular to their original profile.

(1) I’ve just realized I forgot to take photos showing the brushes’ size. They are 4×5 mm, currently 10 mm in length. Certainly still pushing well against the commutator.

johansen:
Whats the problem?

Jeff eelcr:
Most pictures look strangely worn, 1 looks normal.
Jeff

perieanuo:
change them, pressure and shape taking rotor shape is the key

wraper:
Looks weird, as if brushes were misaligned with commutator and one side has no wear at all, the same as 2/3 of commutator.  Does the brush size match the slot size properly? And are the brush slots located correctly above the commutator?

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