A 6000V high-voltage motor, 3000r/min, during operation, the non-driving end bearing instantaneously reached a high temperature of 200 degrees and shut down due to self-protection.
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The picture below shows the removed inner gland of the non-drive end bearing of the motor. It is made of aluminum alloy and is locked with the shaft. Destructive disassembly can only be used. I would like to ask: 1. Why use aluminum alloy materials, but not steel materials? 2. Why should the gland be so thick? 3. What is the cause of shaft holding?
1. Protect the shaft. Just like why you use a copper hammer or a rubber hammer to hit steel when you work. 2. Your thickness is relative. Whether the unit is large or small, the size of the bearing gland is determined based on the load capacity and other factors. Moreover, the thickness you feel may also be thin for large units. 3. The general reason should be that the lubricating oil inlet is blocked. This should be determined based on your operating trend, including a series of parameters of the driving equipment.
The grease nozzle is not clogged and runs smoothly.； Only the oil drain hole is blocked
Take part. This reason should be that the bearings are damaged. It is recommended to check whether the thrust bearings and support bearings are damaged. Once damaged, it can cause friction between the spindle and the baffle. This should not be the main cause of the accident.
According to the information provided by the host: 1. The aluminum alloy material is chosen for the purpose of protecting the shaft. The material is softer than the shaft, so that the service life of the shaft is longer. ； 2. Part of the reason for the thickness is to consider the design strength and choose aluminum alloy material. To ensure the strength, the design is thicker. ； 3. The 6000v high-voltage motor should be designed with bearings. The reason for the shaft holding is that the bearing (shell) may be dry-worn due to lack of oil. The temperature of the bearing bush reaches 200°C. After the aluminum alloy gland melts, it is held together with the shaft.
The temperature curve suddenly rises vertically from about 40 degrees to exceed the temperature measurement range, and the motor jumps and stops.