What happens when the high-voltage YE3 motor encounters a bore scanning failure?

It's really difficult to learn from a normal YE3 motor. Learning from the analysis process of a faulty YE3 motor is a shortcut that involves any possible link. Today we will share a case of a sweeping failure, from which we can discover some unsuitability in the processing technology and operation process of YE3 motor.

This case involves a high-voltage YE3 motor, which emits a friction like sound after 40 minutes of frequency overlap testing. The responsive tester immediately stopped the machine, and upon disassembly and inspection, it was found that both the stator and rotor had full circumference scratches. The tendency of the stator or rotor cause was not obvious, and no abnormalities were found after checking all dimensions.

Upon further inspection, a metal chip approximately 30mm long was found in the cavity of the amplitude plate shaft, and the cause of the malfunction was basically identified. Following this idea, the ground metal chip was found at the position of the stator sweeping chamber. After cleaning, it was reassembled. During the YE3 motor test, abnormal noise occurred again. Compared with the previous sound, there was a clear discharge sound this time, and the YE3 motor could only be disassembled again.

Upon disassembly and inspection, it was found that there was a solid scratch at another location, with obvious marks all around the rotor. Due to the judgment of disassembly inspection, the same metal steel shavings were found at the corresponding location of the stator scratch. After thorough cleaning and secondary immersion painting, no abnormalities were found in the YE3 motor test.

To investigate the root cause of the problem, it is found that the YE3 motor has a fixed rotor iron core with radial ventilation ducts and a rotor with an internal fan. According to the current operating procedures, the end holes for fixing the internal fan are installed after the rotor iron core is fitted onto the shaft.

After investigation, it was found that this method was chosen for the convenience of positioning during drilling. The steel shavings generated during the drilling process are easily able to enter the radial and axial channels on the rotor, and it is difficult to clean them later because the steel shavings are in a spiral shape of varying lengths, which can easily hang in a certain position. When the YE3 motor is running, they are randomly thrown out, either for sweeping the chamber or for hitting the ground, causing fatal damage to the YE3 motor.

From this case, we can see that there are obvious quality hazards in the process of drilling the fixing holes for the internal fan. If it is processed before the rotor is installed, there will be no such quality hazards; If the production is done after installing the shaft and necessary protective measures are taken, such problems will not occur.

It has been proven that the processing technology is not only a problem of the processing itself, but also needs to take into account the quality issues that may be affected by it.