由旋转磁场理论分析可知，如果定子对称三相绕组被施以对称的三相电压，就有

Theoretical analysis shows that a rotating magnetic field, if the stator winding is a symmetrical three-phase symmetrical three-phase voltage applied, there is a symmetrical three-phase current flows, and will form a magnetic field rotating in the air gap of the motor, the rotational speed of the magnetic field n1 is called synchronous speed, the motor of the magnetic pole frequencies f1 and its relationship to the grid of the number p is: n1 = 60 f1 / p phase sequence and steering arrangement of three-phase windings and three-phase currents related figures U, V , W-phase are arranged in the clockwise direction, when the three-phase current stator winding Walter U, V, W phase sequence stator a rotating magnetic field is turned clockwise. Since the rotor is stationary, there is between the rotor and the rotating magnetic field relative motion, because the rotor conductor cutting magnetic field generates an induced electromotive force of the stator, the rotor windings due to their closed, there will be current flowing within the rotor winding. Active rotor current and rotor phase induced electromotive force, whose direction can be "right-hand generator set is" OK. The active component of the current carrying rotor winding of a rotating magnetic field in the stator, the electromagnetic force F, which direction from "left motive given is" OK. An electromagnetic force to form a magnetic torque shaft, which is consistent with the direction of action of the rotating field direction, dragging along the rotational direction of the rotating magnetic field of the rotor rotates, the input electrical energy into rotational mechanical energy. If the motor shaft with a mechanical load, the mechanical load is rotated with the rotation of the motor, the motor load of the mechanical work done.

From the theoretical analysis of the rotating magnetic field, it can be seen that if the stator symmetrical three-phase winding is applied to a symmetrical three-phase voltage, there will be a symmetrical three-phase current flow, and will form a rotating magnetic field in the air gap of the motor, the speed of which is called synchronous speed, it is related to the frequency f1 of the grid and the magnetic pole xrometer p of the motor. : n1-60 f1/p steering is related to the arrangement of three-phase windings and phase sequence of three-phase currents, the U, V, And W phases in the figure are arranged in a clockwise direction, and when the three-phase current in the stogmer winding stalking U, V, and W is sequenced, the stogand rotation magnetic field is a clockwise turn. Because the rotor is stationary, there is relative motion between the rotor and the rotating magnetic field, the rotor conductor is induced by cutting the stator magnetic field to produce an induced electric potential, because the rotor winding itself is closed, there is current flow within the rotor winding. The rotor active current and the rotor sensing electric potential phase, the direction of which can be determined by the "right-handed generator set the rules". A rotor winding containing active component current will produce an electromagnetic force F under the action of the stator's rotating magnetic field, and its direction will be determined by the "left-handed motive. " Electromagnetic force to the axis to form an electromagnetic rotation, its direction of action and the direction of the rotating magnetic field is consistent, dragging the rotor along the rotation of the magnetic field rotation direction, the input of electrical energy into rotating mechanical energy. If there is a mechanical load on the shaft of the motor, the mechanical load rotates with the rotation of the motor, and the motor works on the mechanical load.

According to the theoretical analysis of the rotating magnetic field, if the symmetrical three-phase winding of the stator is applied with symmetrical three-phase voltage, there will be symmetrical three-phase current flowing through, and a rotating magnetic field will be formed in the air gap of the motor. The rotating speed n1 of this magnetic field is called the synchronous speed. Its relationship with the frequency f1 of the power grid and the pole logarithm P of the motor is: N1 = 60 F1 / P. the arrangement of the three-phase winding is as follows It is related to the phase sequence of the three-phase current. The U, V and W phases in the figure are arranged in a clockwise direction. When the three-phase current in the stator winding is connected with the phase sequence of u, V and W, the rotating magnetic field of the stator turns clockwise. Because the rotor is stationary, there is relative movement between the rotor and the rotating magnetic field. The rotor conductor produces induced electromotive force due to cutting the stator magnetic field. Because the rotor winding itself is closed, there is current flow in the rotor winding. The active current of the rotor is in phase with the induced electromotive force of the rotor, and its direction can be determined by the "right hand generator rule". The rotor winding with active component current will produce electromagnetic force F under the action of stator rotating magnetic field, and its direction is determined by "left-hand motor rule". The electromagnetic force forms an electromagnetic torque on the rotating shaft, which acts in the same direction as the rotating magnetic field, dragging the rotor to rotate along the rotating direction of the rotating magnetic field, and turning the input electric energy into the rotating mechanical energy. If there is a mechanical load on the motor shaft, the mechanical load rotates with the rotation of the motor, and the motor works on the mechanical load.<br>