Motor and pump bearing temperature standards-Xinda Motor- electric motors and EV accessories supplier|INDEX--

Motor and pump bearing temperature standards

Date：2022-07-26　　　Author：XINDA MOTOR

1. Bearing temperature standard - pump bearing temperature standard

1. GB3215 4.4.1 During the working period of the pump, the maximum temperature of the bearing shall not exceed 80℃

2. JB/T5294 3.2.9.2 The temperature rise of the bearing shall not exceed the ambient temperature 40°C, and the maximum temperature shall not exceed 80°C

3. JB/T6439 4.3.3 When the pump is running under the specified working conditions, the temperature of the outer surface of the built-in bearing should not be higher than the temperature of the conveying medium by 20℃, and the maximum temperature should not be higher than 80℃. The temperature rise of the outer surface of the externally mounted bearing should not be higher than the ambient temperature by 40°C. The maximum temperature is not higher than 80℃

4. JB/T7255 5.15.3 The operating temperature of the bearing. The temperature rise of the bearing shall not exceed 35°C of the ambient temperature, and the maximum temperature shall not exceed 75°C

5. JB/T7743 7.16.4 The temperature rise of the bearing shall not exceed the ambient temperature 40℃, and the maximum temperature shall not exceed 80℃

6. JB/T8644 4.14 The temperature rise of the bearing shall not exceed the ambient temperature of 35℃, and the maximum temperature shall not exceed 80℃

2. Motor bearing temperature regulation, abnormal cause and treatment

The 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 does not exceed 55 ℃ (the temperature rise is the bearing temperature minus the ambient temperature during the test);

(1) Reason: the shaft is bent and the center line is not allowed. Processing; re-find the center.

(2) Reason: The foundation screw is loose. Remedy: Tighten the foundation screws.

(3) Reason: The lubricating oil is not clean. Treatment: Replace the lubricating oil.

(4) Reason: The lubricating oil has been used for too long and has not been replaced. Treatment: Clean the bearing and replace the lubricating oil.

(5) Reason: The balls or rollers in the bearing are damaged.

Treatment: Replace the bearing with a new one. According to the national standard, F-class insulation B-class assessment, the motor temperature rise is controlled at 80K (resistance method), 90K (component method). Considering the ambient temperature of 40°C, the maximum operating temperature of the motor cannot exceed 120/130°C. The maximum bearing temperature is allowed to be 95 degrees. Use an infrared detection gun to measure the temperature of the bearing's outdoor surface. Experience, the highest point temperature of a 4-pole motor cannot exceed 70°C. For the motor body, no monitoring is required. After the motor is manufactured, under normal circumstances, its temperature rise is basically fixed, and will not change abruptly or continuously increase with the operation of the motor. Bearings are wearing parts and need to be inspected.

Motor and pump bearing temperature standards

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