1. When the magnetic field motor is loaded with load, the current flows through the armature winding, and a magnetomotive force is formed. This magnetic flux is called the armature magnetomotive force. Therefore, the air gap magnetic field in the motor is created by the excitation magnetomotive force and the armature magnetomotive force. It can be seen that in a DC motor, the air gap magnetic field changes from no load to load.
2. Armature reaction
1) The influence of the armature magnetomotive force on the air gap magnetic field generated by the field magnetomotive force is called the armature reaction. For the sake of simplicity of drawing, only one layer is drawn on the edge of the element, and the armature is considered to be smooth.
Considering the same direction of current flow in the component under a certain polarity, the armature magnetic field distribution is obtained.
Figure 1.3..10 considers the air gap magnetic field distribution after the armature reaction. It can be seen that the position of the armature reaction flux potential axis always coincides with the brush axis. When the brush is in the geometric neutral line, the armature reaction magnetic potential and Magnetic pole axes are perpendicular to each other
5) The armature reaction causes the air gap magnetic field to be distorted. The armature magnetic field weakens the main magnetic field by half, and the other half strengthens and makes the armature surface magnetic density equal to zero leaving the geometric neutral line.
6) Electromagnetic reaction is demagnetized
* The amount of weakening of the main magnetic field when the magnetic circuit is not saturated is exactly equal to the amount of strengthening.
* When the magnetic circuit is critically saturated, the magnetization will increase the saturation of the half pole and the core group will increase.
The saturation of the other half of the pole is reduced, and the core magnetic group is reduced by the critical saturation of the magnetic circuit, so that the actual synthetic magnetic field curve is slightly smaller than the magnetic flux reduction, which is slightly lower than the saturation.
*Conclusion Another result of the armature reaction is a decrease in the per-pole flux under motor load conditions.
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