DIY & Home Improvement

intrepidity

(8,187 posts) Thu Oct 13, 2022, 05:50 PM Oct 2022

Question about AC motor brushes [View all]

Is there a reason that the copper wire connecting the carbon brush is not insulated?

I've just been learning about these motors while trying to fix some household devices, and one thing I've noticed is that *all* the other wires are either coated or sheathed, *except* the short (~1" ) wire connected to the carbon brush.

I'm about to reassemble one, but suddenly wondered whether I should insulate those wires first.

Does it have to do with flexibility so that the brushes are minimally restricted?

It just seems like such a vulnerability.

If anyone knows, please advise asap. TIA!

17 replies

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Question about AC motor brushes [View all] intrepidity Oct 2022 OP

Might be flexibility SheltieLover Oct 2022 #1

Thanks for the quick reply! intrepidity Oct 2022 #4

Yw! SheltieLover Oct 2022 #7

What's his number? intrepidity Oct 2022 #9

From my experience --- mainly from servo motors in industry. Yonnie3 Oct 2022 #2

Thanks much for replying intrepidity Oct 2022 #5

Never have seen them insulated and have worked on many motors. Just be sure you have RKP5637 Oct 2022 #3

Yep, thanks intrepidity Oct 2022 #6

Oh hey, another question if you don't mind intrepidity Oct 2022 #8

Hi, don't use WD40 on it anyplace. WD40 sometimes acts as a solvent and can RKP5637 Oct 2022 #11

In time for the next one, yes intrepidity Oct 2022 #14

... RKP5637 Oct 2022 #16

Agree with RKP on no WD-40. KY_EnviroGuy Oct 2022 #12

All excellent suggestions!!!!!! n/t RKP5637 Oct 2022 #13

Thanks for the good tips. intrepidity Oct 2022 #15

Electrical coatings KY_EnviroGuy Oct 2022 #17

It's all about flexibility tech3149 Oct 2022 #10