A prerequisite for the three-phase asynchronous motor to be rotated is to have a rotating magnetic field, and the stator windings of the three-phase asynchronous motor are used to generate a rotating magnetic field. We know that the voltage between the phase and the phase of the phase is 120 degrees out of phase, and the three windings in the stator of the three-phase asynchronous motor are also 120 degrees out of phase in the spatial orientation, so that when passing through the stator winding When entering a three-phase power supply, the stator winding produces a rotating magnetic field. Each time the current changes, the rotating magnetic field rotates in space for one week, that is, the rotational speed of the rotating magnetic field is synchronized with the change of current. The rotational speed of the rotating magnetic field is: n=60f/P where f is the power supply frequency, P is the number of magnetic pole pairs of the magnetic field, and the unit of n is: revolutions per minute. According to this formula, we know that the speed of the motor is related to the number of poles and the frequency of using the power supply.
A single-phase AC motor has only one winding and the rotor is squirrel-cage. When a single-phase sinusoidal current passes through the stator winding, the motor generates an alternating magnetic field. The strength and direction of the magnetic field change sinusoidally with time, but it is fixed in spatial orientation, so the magnetic field is also called alternating. Pulsating magnetic field. The alternating pulsating magnetic field can be decomposed into two rotating magnetic fields with opposite rotation speeds at the same rotation speed. When the rotor is stationary, the two rotating magnetic fields generate two equal and opposite torques in the rotor, so that the synthesis The torque is zero, so the motor cannot rotate. When we use an external force to rotate the motor in a certain direction (such as clockwise rotation), the movement of the cutting magnetic field between the rotating magnetic field of the rotor and the clockwise rotation direction becomes smaller; between the rotating magnetic field of the rotor and the counterclockwise rotation direction The cutting magnetic line motion becomes larger. This balance is broken, the total electromagnetic torque generated by the rotor will no longer be zero, and the rotor will rotate in the direction of the push.
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