In other words, why are some electric motors very quiet but others are so loud? Why can't they make a quiet vacuum cleaner?
in vehicles,provided a silencer for reducing noise.the fact that Electric motors are very quiet than IC engines used in vehicles.Now a day many companies make quiet vaccum cleaner.
The noise of a vacuum does not come from the motor, but from the eddies in the air being sucked. Open a vacuum cleaner and remove the impeller (the fan) and it would get a lot more quiet.
