Is a DC motor really more energy-efficient than an AC motor and a variable-speed gear motor (gearbox)?

Unlike traditional AC fans that use copper wire wrapping and alternating current, DC electric fans use a fixed voltage transformer, combined with internal permanent magnet magnets and controllers, adopting a direct current brushless motor. This allows the coils to rotate alternately, generating changes in the magnetic field, reducing the significant frictional losses generated during operation. This not only makes the electric fan more energy-efficient but also keeps it quiet even during low-speed operation, ensuring a peaceful environment during quiet nights.
DC electric fans also have the following advantages: multiple speed settings, providing greater flexibility in adjustment.