"SteveB" writes:

Google ozone. Ozone's chemical sign is 03, which means it is oxygen (02)
with an additional oxygen molecules. You can smell it when around an
electric motor, and the larger the motor, the more ozone.

True for universal motors, with arcing brushes. But induction motors
have no brushes, no arcs, and produce no ozone. Not much point in
sniffing around them.

You can sometimes smell ozone in the air after a thunderstorm.

Dave