When the three-phase symmetrical resistance is loaded, the armature reaction is a quadrature-axis reaction, because the phase of the current is consistent with the output voltage, and the armature magnetic field generated is at the quadrature-axis position, so it is a quadrature-axis reaction, and its essence is that the magnetic field moves backward and the magnetic field is enhanced. However, due to the geometric structure of the magnetic pole, the magnetic field distribution is distorted, the magnetic field at the leading edge of the magnetic pole is weakened, and the magnetic field at the trailing edge of the magnetic pole is enhanced.

Under the three-phase symmetrical capacitive load, the armature reaction is a direct-axis reaction, because the phase of the current is 90 degrees ahead of the transmission voltage, and the armature magnetic field generated is on the axis of the magnetic pole, so it is a direct-axis reaction, and its essence is to increase the magnetic field.

Under the three-phase symmetrical inductive load, the armature reaction is a direct-axis reaction, because the phase of the current lags behind the 90-degree potential angle of the transmission voltage, and the armature magnetic field generated is on the axis of the magnetic pole, so it is a direct-axis reaction with degaussing properties.