Three-phase Symmetrical Alternating Current

Three-phase symmetrical alternating current

The three-phase stator winding generates a rotating magnetic field in space through three-phase symmetrical current, as shown in the figure

Formation of Rotating Magnetic Field in Asynchronous Motors

When the phase of the AC power is 0=00, IA=0, IB is negative, and IC is positive. At this time, there is no current at wire terminals A and X. The current in winding BY flows in and out of B from Y, and the current in winding CZ flows in and out of Z. The direction of the magnetic induction line in Figure (a) is determined by the right-hand spiral rule of Ampere (as indicated by the dashed arrow)

When the AC phase is 0=1200, IB=0, IA is positive, and IC is negative. At this time, there is no current at wire terminals B and Y, and the current in winding AX flows in and out of A, while the current in winding CZ flows in and out of C. The direction of the magnetic induction line in Figure (b) is determined by the right-hand spiral rule of Ampere (as indicated by the dashed arrow)

When the AC phase is 0=2400, IC=0, IA is negative, and IB is positive. At this time, there is no current at the wire terminals C and Z, and the current in winding AX flows in and out of A from X, while the current in winding BY flows in and out of Y. The direction of the magnetic induction line in Figure (c) is determined by the right-hand spiral rule of Ampere (as indicated by the dashed arrow)

When the phase of the alternating current is the same as the state in Figure (a), repeating the previous process, it can be seen that the three-phase alternating current in the stator winding changes by one cycle, and the spatial composite magnetic field also changes by one cycle with the phase sequence of the alternating current. As the alternating current continues to change, the spatial composite magnetic field continuously rotates, forming a rotating magnetic field. The direction of the rotating magnetic field is determined by the phase sequence of the AC power connected to the stator. As long as the phase sequence of the AC power is changed (such as connecting phase A to phase B), the phase sequence of the rotating magnetic field changes accordingly.

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