Three-phase asynchronous motors are what we often call AC motors

The prerequisite for the rotation of three-phase asynchronous motors is to have a rotating magnetic field. The stator windings of three-phase asynchronous motors are used to generate rotating magnetic fields. As we all know, the phase-to-phase voltages between phases differ by 120 degrees, and the spatial directions of the three windings of the stator of a three-phase asynchronous motor also differ by 120 degrees. In this way, when the stator winding passes, when the three-phase power supply is turned on, the stator winding generates a rotating magnetic field.

The rotating magnetic field rotates once in space when the current changes once per cycle. In other words, the rotation speed of the rotating magnetic field is synchronized with the change in current. The rotation speed of the rotating magnetic field is as follows. n=60f/PHere, f is the power supply frequency, P is the number of pole pairs of the magnetic field, and the unit of n is the number of rotations per minute. According to this formula, the speed of the motor is related to the frequency of the magnetic poles and the frequency of the power supply.

The winding of a single-phase three-phase asynchronous motor is 1, and the rotor is in the shape of a sedan. When a single-phase sinusoidal current passes through the stator winding, the motor generates an AC magnetic field. The intensity and direction of this magnetic field change sinusoidally over time, but because it is fixed in space, this magnetic field is also called an interactive pulsating magnetic field. This interactive 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 generate two torques in the rotor, which are flat and opposite in direction, so the torque is 0 when they are formed, so the motor cannot rotate.

When an external force is used to rotate the three-phase asynchronous motor in a specific direction (clockwise rotation, etc.), the movement of the cutting magnetic field between the rotating magnetic field and the rotating magnetic field in the clockwise direction becomes smaller. The movement of the magnetic lines of force cut between the rotating magnetic field and the counterclockwise rotating magnetic field becomes larger. In this way, the balance collapses, the total electromagnetic torque generated by the rotor will not be zero, and the rotor will rotate in the propulsion direction.

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