Take for example ceiling fans: the newer DC motor ones use up to 70% less electricity than conventional AC motor fans for the same size/output (although cost more to purchase).
In: Physics
Cheap DC motors are more efficient than cheap AC motors.
But the most efficient motors are actually AC with smart controls (see Switched Reluctance Motors). But the thing is that the frequency of the power on the motor is different from the one from the main line, so it typically involves a conversion to DC somewhere.
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