AC power, its direction is not only changing, its size is constantly changing, usually we say 220V or 380V refers to its effective value. Its changing waveform is a sine wave. In the coil inside the three-phase motor, a rotating magnetic field is formed by the orderly change of the magnitude and direction of the current. Therefore, the rotor is driven to rotate. At this time, the voltage of the motor is 380V, which is the voltage between the two phase lines. The single-phase motor only takes one of the phases, which is 220V. One phase does not produce a rotating magnetic field, so a point is added to the motor. Make it produce a rotating magnetic field similar to three phases. And make the motor rotate. Single-phase motors are used at home. Because there is only single phase electricity in the house. One phase means that the line equivalent to the home line is electrified, and the other one is the zero line, which cannot be said to be the phase line.
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