Considering an ambient temperature of 40℃, the maximum operating temperature of the motor should not exceed 120/130℃. The maximum allowable bearing temperature is 95℃.
I. Bearing Temperature Standards - Pump Bearing Temperature Standards
1. GB32154.4.1 During pump operation, the maximum bearing temperature shall not exceed 80℃.
2. JB/T52943.2.9.2 The bearing temperature rise shall not exceed 40°C above the ambient temperature, and the maximum temperature shall not exceed 80°C.
3. JB/T64394.3.3 When the pump operates under specified conditions, the outer surface temperature of the internal bearing should not exceed the temperature of the conveyed medium by 20℃, and the maximum temperature should not exceed 80℃. The outer surface temperature rise of the external bearing should not exceed the ambient temperature by 40℃, and the maximum temperature should not exceed 80℃.
4. JB/T72555.15.3 Operating Temperature of Bearings. The temperature rise of the bearing shall not exceed 35℃ above the ambient temperature, and the maximum temperature shall not exceed 75℃.
5. JB/T77437.16.4 The bearing temperature rise shall not exceed 40℃ above the ambient temperature, and the maximum temperature shall not exceed 80℃.
6. JB/T86444.14 The bearing temperature rise shall not exceed 35℃ above the ambient temperature, and the maximum temperature shall not exceed 80℃.
II. Motor bearing temperature specifications, causes of abnormalities, and handling methods
The regulations stipulate that the maximum temperature of rolling bearings shall not exceed 95℃, and the maximum temperature of sliding bearings shall not exceed 80℃. Furthermore, the temperature rise shall not exceed 55℃ (temperature rise is the bearing temperature minus the ambient temperature during testing).
(1) Cause: The shaft is bent and the center line is inaccurate. Solution: Re-align the center.
(2) Cause: The foundation screws are loose. Solution: Tighten the foundation screws.
(3) Cause: The lubricating oil is not clean. Solution: Replace the lubricating oil.
(4) Cause: The lubricating oil has been used for too long and has not been changed. Solution: Clean the bearing and change the lubricating oil.
(5) Cause: Damage to the balls or rollers in the bearing.
Solution: Replace the bearing. According to national standards, for F-class insulation and B-class testing, the motor temperature rise should be controlled at 80K (resistance method) or 90K (component method). Considering an ambient temperature of 40℃, the maximum operating temperature of the motor should not exceed 120/130℃. The maximum allowable bearing temperature is 95℃. Use an infrared detector to measure the temperature of the bearing housing surface. Empirically, the highest temperature of a 4-pole motor should not exceed 70℃. The motor body itself does not require monitoring. After manufacturing, the motor's temperature rise is generally fixed and will not change abruptly or increase continuously during operation. However, the bearing is a consumable part and requires inspection.
Disclaimer: This article is a reprint. If it involves copyright issues, please contact us promptly for deletion (QQ: 2737591964 ) . We apologize for any inconvenience.
