Presumably, many of my friends have encountered the phenomenon of sweeping the bore in the process of using the stator and rotor of the motor. Many of my friends do not know the reasons for this situation and the solutions. Let me introduce you to you.

When the stator and rotor rotate, the phenomenon that the outer ring of the rotor and the inner circle of the stator collide is called the motor stator and rotor rubbing, which is generally called motor sweeping. According to the specific conditions of the sweeping, the sweeping can be divided into actual sweeping and There are two virtual scans. The so-called real sweep, that is, the stator and rotor cores actually rub each other, indicating that the air gap between the stator and the rotor is very uneven. Severe sweeping phenomenon will always generate high temperature in the inner circle of the stator, and the insulation of the groove surface will become under high temperature. Scorch is brittle, causing the winding to ground or short circuit. At the same time, the actual scanning can also increase the vibration and noise of the motor, and reduce the electrical performance. The so-called virtual sweep, that is, the stator and rotor cores are not actually rubbed, but the rotor and the stator inner circle convex insulation or oil dirt are rubbed together, indicating that the inside of the motor is very dirty, check and clean it, and then put it in after it is clean. run.

Since there are many factors that cause the motor punching to sweep the bore, and are intertwined with each other, the main factors are described as follows:

1. Poor quality of the iron core (the stator iron core shrinks, the rotor iron core expands);

2. The shaft is bent;

3. The interior is not clean (oil stains, iron filings, paint tumors);

4. The slot wedge is higher than the core (when the wire is embedded, the slot sealing is not good; the stator phase insulation is too long; the stator winding is not well shaped; the slot wedge size is inappropriate);

5. The end cover bearing chamber is too large (improper turning, too many disassembly and assembly times);

6. Improper fit of the stop (large stop of the machine base, small stop of the end cover).