What are the maximum allowable temperatures for the bearings of a centrifugal pump and the stator of its motor? What happens if it’s too high?
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I’d like to ask for advice
It is generally not more than 75; if it is too high, it indicates that there is a problem somewhere, such as with the bearings or bearing shells
As the temperature rises, the viscosity of the lubricating oil decreases.
Since the bearing temperature of centrifugal pumps and the temperature of the motor stator cannot be measured accurately, infrared thermometers are generally used to measure the temperature of the motor casing and the bearing housings; as a result, it is not possible to establish an exact criterion for evaluation. In my experience, the temperature on the motor side should not exceed 90 degrees, while that on the bearing side should not exceed 65 degrees. Additionally, different bearing materials need to be taken into consideration, and consulting the manufacturer of the pump’s bearings will provide a satisfactory answer.
Our requirement is that the temperature on the motor side should not exceed 90 degrees, and that on the bearing side it should not exceed 75 degrees. Excessively high temperatures can cause the viscosity of the bearing lubricant to decrease, leading to increased loss of lubricant. In addition, very high temperatures in the motor can cause the insulation layer of the enameled wires to melt, resulting in short circuits.
The temperature for grease lubrication should not exceed 80 degrees, while for oil lubrication it should not exceed 70 degrees.
The bearing temperature of a centrifugal pump should ideally not exceed 75°C, and the temperature of the motor stator should also not be too high; it is recommended that it not exceed 80°C. For the specific parameters, you can refer to random information or consult the manufacturer; if the temperature is too high, the bearing shells will be damaged.
Motor manufacturers have said that the temperature on the motor side of the bearings should not exceed 95 degrees, while on the bearing side it should not exceed 75 degrees
First, it needs to be determined by referring to random data. Under normal circumstances: The temperature of both the electrical axis bearings and the pump bearings should be kept below 70°C as much as possible ； The motor stator temperature should be below 90°C, but there are also requirements that it should not exceed 120°C (this must be checked in the motor’s user manual).