Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Single chip microcomputer STM32L151CCU6

SMD aluminum electrolytic capacitor

Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ) 7.5PF 10PPM 20PPM 30PPM

1. When a magnetic field motor is under load, current flows through the armature winding, generating a magnetomotive force. This flux is referred to as the armature magnetomotive force. As a result, the air gap magnetic field in the motor is influenced by both the excitation magnetomotive force and the armature magnetomotive force. It's clear that in a DC motor, the air gap magnetic field changes significantly from no load to full load conditions.

2. Armature Reaction

1) The effect of the armature magnetomotive force on the air gap magnetic field produced by the main field is known as armature reaction. For simplicity, only one layer is drawn at the edge of the element, and the armature is considered smooth. By considering the same direction of current flow in components under a specific polarity, we can determine the distribution of the armature magnetic field.

Figure 1.3..10 illustrates the air gap magnetic field distribution after the armature reaction. As shown, the position of the armature reaction flux potential axis always aligns with the brush axis. When the brush is located at the geometric neutral line, the armature reaction magnetic potential is perpendicular to the pole axis.

5) The armature reaction causes distortion in the air gap magnetic field. The armature magnetic field weakens the main magnetic field on one side, while it strengthens it on the other, resulting in zero magnetic density at the geometric neutral line.

6) Electromagnetic reaction leads to demagnetization:

* When the magnetic circuit is not saturated, the weakening of the main magnetic field is equal to the strengthening effect.

* When the magnetic circuit is critically saturated, the magnetization increases the saturation of one half of the pole, while reducing it on the other. This results in a slight reduction in the synthetic magnetic field curve compared to the original, indicating a lower level of saturation.

* Conclusion: Another consequence of the armature reaction is a reduction in the per-pole flux when the motor is under load. This has a direct impact on the performance and efficiency of the motor, especially under varying load conditions.