One-time lubrication life test of motor rotor bearings
The oil-lubricated ball bearing used in the rotor of the motor is characterized by low load bearing, high precision, long service life, small friction torque and high stability. Under normal operating conditions, an important factor affecting bearing life, friction torque and reliability is the lubrication of the bearing. When the bearing is under certain working conditions (such as vacuum closed environment), it can only rely on the lubricating oil contained in the cage to maintain the lubrication of the bearing and keep the rotor of the motor running normally. It is a one-time lubrication. The special working environment (vacuum sealing) and long life requirements of the rotor of the motor, even if the bearing of the oil-containing cage is used, it is difficult to meet the requirements. It is necessary to provide a matching oil supply system to supplement the oil supply to ensure sufficient lubrication of the bearing. When oil is supplied to the bearing, the lubrication state of the bearing needs to be analyzed to determine the approximate time for refueling.
Lubrication of bearings Although there are many theoretical calculation formulas and application experience, they have considerable limitations. The mathematical model and empirical coefficient of the calculation formula are generally established under the ideal process quality conditions, and the obtained values tend to deviate from the actual value. The complexity and systemicity of bearing lubrication determines that test and test analysis are important basis for testing bearing lubrication design.
The one-time lubrication life of the bearing refers to the time during which the bearing can maintain normal operation by the cyclic lubrication established by the lubricating oil contained in the cage without external relubrication. The way of bearing failure is not fatigue failure, mainly due to the lack of lubrication to produce precision failure, which in turn causes bearing wear failure. In order to study the effect of one-time lubrication on the life of the motor bearing, a 1:1 simulation test was carried out under the same working conditions.
