Motor bearing load and heat generation

When the motor bearing temperature is not significantly higher than the motor base temperature, the overall heating of the motor bearing is not the main component of the motor heating, and the temperature distribution at this time is in line with the normal temperature distribution. Therefore, from the perspective of temperature distribution, the possibility of determining that the bearing is faulty can be roughly reduced. When the temperature of the motor bearing is significantly higher than the temperature of the surrounding motor end cover and frame, the bearing as a main heating element as a whole obviously affects the overall temperature distribution of the motor. This is different from the temperature distribution that should be between the motor bearing and the frame. At this time, there is reason to doubt whether the motor bearing has some faults.

The temperature of the motor bearing is significantly higher than the temperature of the machine base. At this time, the temperature sources of the bearing include the inside of the bearing and the outside of the bearing. The heat outside the bearing comes from adjacent parts such as the shaft and the bearing chamber. The internal temperature of the bearing comes from various frictions inside the bearing. When the bearing temperature is higher than the base temperature, it means that the friction inside the motor bearing occupies the mainstream of heat generation and becomes the main part that affects the temperature rise.

The main factors that cause heating of motor bearings include the following points:

Motor bearing load

Motor bearing speed

Lubrication of motor bearings

Sealing of motor bearings

Related contamination in the bearing

Damage inside the bearing