Motor temperature
Thread Content
The temperatures of the stator and the bearings at the shaft extension end of our high-voltage motors are unstable. Especially in summer, the stator temperature approaches 100 degrees and shows a tendency to rise further, while the temperature of the bearings at the shaft extension end exceeds 80 degrees. Even the use of additional ventilators does not help – how can this problem be solved?
Is it because the stator temperature rises, causing heat to be transferred to the bearing at the shaft extension end? Is there too much dust accumulated on the stator?
The working load of this motor is certainly not low; by comparing the measured current with the rated current, one can determine the actual load ratio. The most likely reason for this is that the quality of the motor is poor. I have also encountered motors that reach high temperatures even when the workload is not high, forcing one to reduce the load in order to use them properly. If the motor chosen is too small, it is advisable to select a motor with an appropriate power rating. When choosing a motor, it is best to opt for modern, energy-efficient models, and prefer brands that are of mid-range or higher quality.
We also have a 400KW motor whose temperature is high! It’s just that the quality of the motor is poor; replacing it with a new one will fix the issue!
The stator temperature is not too high; generally, for high-voltage motors, a stator temperature below 135°C is considered acceptable. To be honest, however, the stator temperature is a bit high, and the bearing temperature is even higher. We have high-voltage motors with a capacity of 1120 KW in our installation, and the highest stator temperature reached is 65 degrees Celsius. The maximum temperature of the bearing is 60°C. I wonder which manufacturer produced the motor in question? Air-cooled or wind-cooled. How long it has been in use could indicate aging of the winding insulation. If the bearing temperature rises, it needs to be repaired.
The high-voltage motor is normal within this temperature range!
High-voltage motors generally don’t have good air cooling, right? I heard from a classmate that battery factories abroad use circulating oil cooling; I was shocked at that time
It is air-cooled and water-cooled. Under normal circumstances, the stator temperature alarm for the motor is set at 130 degrees. Check the water pressure and for blockages in the cooler. Check whether there is any greasy substance attached to the stator coils. The bridge is used to check the resistance of the windings. Is the current within the rated range?
A bearing temperature above 90 degrees is considered quite high.
Both the 280-kilowatt and 560-kilowatt models are air-cooled; it doesn’t help even if the air ducts are cleaned