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AC and DC motors for ceiling fans

Working principle of AC fan: The difference between AC fan and DC fan. The former power supply is AC, and the power voltage will vary positively and negatively. Unlike DC fans, which have a fixed power supply voltage, they must rely on circuit control to rotate the two sets of coils in order to generate different magnetic fields. Due to the fixed power frequency of the AC fan, the speed of magnetic pole change generated by the silicon steel sheet is determined by the power frequency. The higher the frequency, the faster the magnetic field switching speed, and theoretically, the faster the rotational speed, just like the principle that the more poles a DC fan has, the faster the rotational speed. However, the frequency should not be too fast as it will cause startup difficulties.

Working principle of DC fan: When a conductor passes through an electric current, a magnetic field is generated around it. If this conductor is placed in another fixed magnetic field, it will generate suction or repulsion, causing the object to move. A rubber magnet pre filled with magnetism is attached inside the blades of the DC fan. Surrounding the silicon steel sheet, two sets of coils are wound around the axis, and Hall sensing components are used as synchronous detection devices to control a set of circuits that rotate the two sets of coils wound around the axis. Silicon steel sheets generate different magnetic poles, which generate attraction and repulsion forces with rubber magnets. When the suction and repulsion force is greater than the static friction force of the fan, the fan blades rotate naturally. Due to the Hall sensing component providing synchronous signals, the fan blades are able to operate continuously.



Post time: Jul-04-2024