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
In short is because a consumer wants to buy a powerful blender but a silent fan, and that drives the engineering efforts. Due to high torques (more power) involved and inter exchangeable parts (think loose connectors vibrating) they will be noisier almost by default. That said they could be engineered to be much more silent, but that would cost more and bring almost no benefit since they are only used for a short amount of time and all the slicing they do is already very noisy.
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