Pump motor temperature
Thread Content
The temperature of the pump’s motor should generally not exceed a certain limit; similarly, the temperatures of the motor bearings and the motor casing should not go above specific levels. Is it okay if these temperatures reach 65 degrees? What causes high temperatures? Does adding too much oil inside the motor affect the temperature of its bearings? 》
There is an alarm interlock value on the drawings of high-voltage motors; this value is usually provided by the motor manufacturer. The typical interlock value is 95 degrees (I think)
Reply to 2# liangmaoqian: Our ones are not high-pressure; they are just ordinary centrifugal pump motors. What is it?
The temperature of rolling bearings must not exceed 70°C, and the temperature of the motor must not exceed 70°C.
Reply to 4# lhyln: What causes it if the temperature exceeds 70 degrees?
The temperature parameters vary for each pump, and the main reasons for temperature exceeding limits are the quality of the lubricating oil (including oil temperature and oil quality)
The temperature of the motor itself? Case temperature? Stator temperature? The temperature of the winding? In any case, the temperature of ordinary electronics does not exceed 70°C. As for the temperature of the stator, factors such as the insulation class of the windings, as well as the condition of the bearings and lubrication, play a role. Additionally, issues like loose foundation bolts, unbalanced motor rotors, poor alignment of couplings, and excessive axial thrust from the pump can all affect the motor’s temperature. Specifically, it depends on comparing and checking the longitudinal data you have for that motor.
Adding too much oil can also cause the temperature to rise.
Reply to 9# jila322: If too much motor oil is used, will the temperature rise?
Generally, most small and medium-sized centrifugal pumps use Y-series (IP44) three-phase asynchronous motors, whose windings are made of Class B insulation material. When the altitude is no more than 1,000 meters and the temperature of the cooled air is no more than 40°C, the temperature rise limit for the motor stator windings (using the resistance method) is no more than 80K. With very few exceptions, motors generally have a temperature rise margin of over 15K. A larger temperature rise margin can extend the service life of the motor and improve its operational reliability. The allowable temperature for the bearing is no more than 95°C (thermometer method).
The motor temperature should generally not exceed 75 degrees; if it does, there is no problem. A high motor temperature can be caused by an inappropriate gap (or damage) in the motor bearings, misalignment of the motor’s magnetic field with the center line, high load on the pump, poor alignment between the pump and the motor shaft, blocked lubrication channels, or insufficient cooling water flow. This needs to be checked one by one!