Why is the electric motor in kitchen mixer/grinders so noisy compared to the motor in a ceiling fan or the motors in an electric car?
In: Engineering
Small tolerances in the gear system make less noise, and also makes the transfer of energy more efficient. Same thing applies to bearings.
Now there isn’t much demand for high precission machined gears and bearings in your kitchen equipment. Granted some high end machines are quieter than their more affordable counterparts.
Electric cars don’t actually need a gear box, they can attach the motor directly to the wheels. I haven’t kept up with electric car designs, but I think this is the common solution nowadays for electric cars, while hybrids use a gearbox.
Now since the sound you hear is poor power transmission, caused by friction and poor contact, in a system which calls for high efficiency you want to avoid this. Better fitting and smaller tolerances produce less noise and achieve greater efficiency and speeds.
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