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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Road noise and insulation play a large part in noise reduction. Even the cheapest cars today have some kind of insulation.
Another is design. Cars only use straight cut gears for reverse, and usually only with a manual transmission. That’s why you hear that heat whine when a manual transmission car backs up. Some luxury sports cars use an angle cut reverse gear to avoid that noise. All the other gears are angle cut to avoid that gear whine.
Power tools and appliances are by design loud. Consumers equate noise with power. I heard a story about an insulated vacuum that was really quiet compared to others and consumers assumed it was weak because of the low noise and would return them. Some professional vacuums are well insulated and have a fraction of the traditional vacuum noise. Power tools use straight cut gears cause they’re cheap.
Another is RC cars. Even the hobby grade cars will use straight cut gears, though there are aftermarket alternatives for the ring and pinion gears for some 4wd models that are cut at an angle.
Another is noise from the electronic speed controls. You may hear a whine from the speed control on some tools and RC cars/boats/planes/etc…. It’s generally a low cost or light weight unit, and they could be built better insulated, but cost and/or weight is a factor.
Often enough, if you can remove and power the motor by just a battery, you will notice a huge difference in noise.
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