Uvw in positive sequence phase AC motor clockwise access u-phase, v-phase, w-phase winding, a magnetic field generated thereby is turning clockwise (ie, winding by the current phase advance current phase shift backward winding ), if any exchange connected to the motor winding two-phase alternating current phase sequence, such as the u-phase alternating current winding is still connected to the u-phase, v-phase winding is connected to the w-phase AC, w-phase winding connected v-phase alternating current, when the phase sequence of the three current counterclockwise, then the resulting shift is counterclockwise rotating magnetic field (the one winding of the current phase advance current phase shift backward winding).

    It can be concluded: a steering motor is a rotating magnetic field, i.e., the steering motor rotor is connected three-phase winding current phase sequence determined by the three-phase alternating current corresponding to the positive-sequence uvw uvw motor windings connected in , the motor rotates in the clockwise direction, and as long as any two of the motor phase windings exchange connected to an electrical phase sequence, the rotating magnetic field, the reverse rotation of the motor is subsequently reversed.