China Motor Fan

- Mar 02, 2021-

Exported to China motor fan is of outstanding quality and strives for perfection. The motor fan is a type of single-phase AC motor. The single-phase AC motor has only one winding and the rotor is squirrel-cage type. When a single-phase sinusoidal current passes through the stator windings, the motor will generate an alternating magnetic field. The strength and direction of this magnetic field change sinusoidally with time, but it is fixed in space, so this magnetic field is also called alternating. Pulsating magnetic field. This alternating pulsating magnetic field can be decomposed into two rotating magnetic fields with the same speed and opposite rotation directions. When the rotor is stationary, these two rotating magnetic fields produce two equal and opposite torques in the rotor, making the synthesis The torque is zero, so the motor cannot rotate. When we use external force to rotate the motor in a certain direction (such as clockwise rotation), the cutting magnetic field lines between the rotor and the clockwise rotating magnetic field become smaller; the rotor and the counterclockwise rotating magnetic field The cutting magnetic field line movement becomes larger. In this way, the balance is broken, the total electromagnetic torque produced by the rotor will no longer be zero, and the rotor will rotate in the direction of pushing. To make the single-phase motor rotate automatically, we can add a starter winding to the stator. The starter winding and the main winding are spaced apart by 90 degrees. The starter winding should be connected in series with a suitable capacitor so that the current with the main winding is in series. The phase difference is approximately 90 degrees, which is the so-called principle of phase separation.

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