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
Ok, firstly the ceiling fan has an induction motor that has no physically touching parts, the fan has permanent magnets that work with the electro magnets in the fan to produce motion, as a fact they are low torque high speed units.
In your food processor, you need high torque and noise is not a problem because it wont be working for very long, the motor in the food processor has brushes, and the spindle has not got permanent magnets but electro magnets, when the electro magnets work against each other they produce way more torque but as a result you can hear the brushes feeding on the electricity as they produce friction. More expensive motors have brushless action but you wont find this in cheap electronics in the home.
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