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Motor bearing temperature regulation, abnormal causes and treatment

Motor bearing temperature regulation, abnormal causes and treatment

2021-04-26

Bearing temperature standard - pump bearing temperature standard

During the operation of the pump, the highest temperature of the bearing shall not exceed 80℃

3.2.9.2 Bearing temperature rise shall not exceed ambient temperature 40, and the highest temperature shall not exceed 80℃

4.3.3 When the pump is running under specified working conditions, the temperature of the outer surface of the inner bearing should not be 20℃ higher than the temperature of the conveying medium, and the highest temperature should not be higher than 80℃.The temperature rise of the outer surface of the external mounted bearing should not be 40℃.The highest temperature is not higher than 80℃

4, JB/T7255 5.15.3 service temperature of bearing.The bearing temperature rise shall not exceed the ambient temperature of 35℃, and the highest temperature shall not exceed 75℃

The bearing temperature rise shall not exceed the ambient temperature of 40℃, and the highest temperature shall not exceed 80℃

Bearing temperature rise shall not exceed the ambient temperature of 35℃, and the maximum temperature shall not exceed 80℃

Motor bearing temperature regulation, abnormal causes and treatment

Regulations stipulate that the maximum temperature of rolling bearings does not exceed 95℃, and the maximum temperature of sliding bearings does not exceed 80℃.And the temperature rise shall not exceed 55℃ (temperature rise is the bearing temperature minus the ambient temperature at the time of testing);

Reason: the shaft is bent and the center line is not allowed.

Processing: Find a new center.

Cause: base screw loose.

Handling: Tighten the base screws.

Reason: the lubricating oil is not clean.

Treatment: replace the lubricating oil.

Reason: the use of lubricating oil for a long time, not replaced.

Treatment: clean the bearing and replace the lubricating oil.

Cause: damage of ball or roller in bearing.

Treatment: replace the new bearing.

According to the national standard, F class insulation B class examination, motor temperature rise control in 80K (resistance method), 90K (component method).Considering that the ambient temperature is 40℃, the maximum operating temperature of the motor cannot exceed 120/130℃.The maximum bearing temperature is 95 degrees.Use the infrared detection gun to measure the temperature of the outdoor surface of the bearing. Experience shows that the highest point temperature of the 4-pole motor cannot exceed 70℃.For the motor body, no monitoring.After the motor is manufactured, in general, its temperature rise is basically fixed, and will not mutate or increase with the motor running.And bearings are wearing parts, need to be tested.

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