1. The silicon steel sheet in the worn part of the iron core is annealed due to frictional overheating, resulting in a reduction in the magnetic permeability of the silicon steel sheet. If not handled in time, as the core insulation of the DC reduction motor ages, the eddy current will continue to increase, causing the temperature to rise, causing the motor to overheat or even burn out.

　　2. When the winding insulation breaks down and short-circuit, an arc is generated, which burns the surface of the iron core. The surface of the burned iron core is often uneven. This will not only affect the normal operation of the DC reduction motor, but also cause a short circuit between the silicon steel sheets and a large eddy current in the iron core.

　　3. Once the bearing is severely worn, overloaded or impacted, the DC reduction motor bearing will be slightly deformed or bent, which will cause the rotor to sweep through the hole. Due to the sweep, the surface of the iron core will be slightly scratched, the iron core will be worn, and the windings will be burned. At this time, the power supply should be cut off immediately to stop the reduction motor and be inspected.

　　For DC reduction motors, different damage locations and solutions are different. The equipment maintenance solution can be operated according to the above introduction to avoid secondary damage to the equipment due to blind operation. I hope you can grasp this answer well.