I mean in comparison with other motors, like power tools or even home appliances? Is it just sound insulation or is it a different kind of motor?
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Electric motors in power tools and appliances are pretty quiet as well, at least larger ones that don’t spin extremely fast.
Usually it’s whatever is attached to the motor that’s making a lot of noise. Power tools and mixers for example have a lot of (cheaply made) gears that are noisy, and for vacuum cleaners, hair dryers and fans, it’s the blades moving through the air that are responsible for most of the noise.
Electric cars usually have gears as well, but ones of a different design with tighter tolerances.
As far as the motors themselves are concerned, brushless motors tend to be somewhat quieter than brushed ones, but the difference is minor compared to the other stuff attached to the motor.
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