The single-phase current flowing through the single-phase motor cannot generate a rotating magnetic field. Capacitors are needed to separate the phases. The purpose is to make the currents in the two windings produce a phase difference close to 90° to generate a rotating magnetic field.
A capacitive induction motor has two windings, a start winding and a run winding. The two windings are spaced 90 degrees apart. A capacitor with a large capacity is connected in series on the starting winding. When the running winding and the starting winding pass through single-phase alternating current, due to the effect of the capacitor, the current in the starting winding is 90 degrees ahead of the current in the running winding and arrives first. maximum value.
Two identical pulsed magnetic fields are formed in time and space, so that a rotating magnetic field is generated in the air gap between the stator and the rotor. Under the action of the rotating magnetic field, an induced current is generated in the motor rotor, and the current interacts with the rotating magnetic field to generate The electromagnetic field torque makes the motor spin up.