Temperature issues with pump motors

The maximum allowable operating temperature of the insulating structure, at which it can maintain its performance over the prescribed service life, within the permitted range and according to its designated heat resistance class. The heat resistance grades are divided into seven categories: Grade Y at 90°C, Grade A at 100°C, Grade E at 120°C, Grade B at 130°C, Grade F at 155°C, Grade H at 180°C, and grades above H. As mentioned above, insulating materials of different heat resistance grades in motors have different maximum allowable operating temperatures. The so-called maximum allowable operating temperature refers to the temperature at which, with long-term use, no significant adverse changes occur in the physical, mechanical, chemical, and electrical properties of the insulating material. If this temperature is exceeded, the properties of the insulating material change drastically or rapid aging occurs. Therefore, the maximum allowable operating temperature of insulating materials is determined based on its economic service life.

Grade A is 100 degrees; one zero was missing

The Ministry of Machinery has a standard specifying that the temperature at the bearing area should not exceed 95 degrees. I don’t remember the name or number of this standard, but I have seen it before.