0
\$\begingroup\$

Some DC motors have a characteristic smell when they run, and today I started wondering what it would be. I noticed it many years ago for some train scale models (probably Märklin), some years later on my father's power drill (handheld, AC powered). Back then I assumed it had something to do with the sparks in there. Now my brushless (and sparkless) cordless drill, a Bosch GSB 10,8, has the same smell when running; another one, DRC 18/4 from Festool, much less so.

The smell is hard to describe, it is not something like a solvent or grease or something that is melting. I’d also say it is strongest for the first few seconds after some idle days.

\$\endgroup\$
9
  • \$\begingroup\$ Burning dust, most likely. \$\endgroup\$
    – Hearth
    Commented Sep 17, 2022 at 17:22
  • 5
    \$\begingroup\$ Does it perhaps smell like a that rainy day smell? If so, that's smell of ozone generated by sparks in the air. \$\endgroup\$
    – DKNguyen
    Commented Sep 17, 2022 at 17:29
  • 1
    \$\begingroup\$ It sounds like the lubrication used in the unit, oil or grease. \$\endgroup\$
    – Gil
    Commented Sep 17, 2022 at 17:56
  • \$\begingroup\$ @DKNguyen ozone is the answer combined with hot varnish on the coils. \$\endgroup\$
    – D Duck
    Commented Sep 17, 2022 at 18:16
  • \$\begingroup\$ I'm with @DDuck and the hot varnish. \$\endgroup\$
    – Transistor
    Commented Sep 17, 2022 at 19:10

0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.