Analysis of the Influence of Bearings on the Efficiency of Hengli Motors
A design friend of Hengli Electric said that their company has a batch of high-efficiency motors for export, and the type test results of motor efficiency are much smaller than the design value. However, the tracking technicians said that the dimensions of all components meet the requirements. When Bai Si couldn't figure it out, the worker who was testing the motor inadvertently said, 'The bearings of this batch of motors are not good, they can't move!'! The later inspection confirmed that there was a problem with the bearing.
The reason for this problem is that the design requires the use of 2RZ bearings, but due to some procurement issues, 2RS bearings were purchased. So, what is the difference between 2RZ bearings and 2RS bearings?
Simply put, 2RS is a double-sided rubber seal, 2RZ is a double-sided dust cover seal, one is a contact type and the other is a non-contact type. 2RS has low noise, but its accuracy is not too high and cannot reach P5 level. The basic dimensions of the two types of bearings are the same. Whether it can be used universally depends on your application scenario. The sealing effect of 2RS is better than that of 2RZ, but the friction resistance is slightly higher. If good sealing is required and there is no oil leakage, it is best to use 2RS.
In the actual production and processing process, in addition to the structure and quality of the bearings themselves, they are also related to the coordination with lubricating grease and bearings. Some motors become very flexible after starting and rotating for a period of time; For manufacturers with conditional monitoring data, the most intuitive fact is that as the motor rotates, the no-load current and no-load loss will have a decreasing trend and tend to stabilize.
Individual customers may control the downtime of the motor. From the test data, it can be found that motors with relatively long downtime have better efficiency than those with relatively short downtime.
Ms. C, another friend who participated in the experiment, did accumulate some data, which is very useful. Their unit adjusted the size of the bearing chamber based on this data, and the effect was very good.
From practical facts, it can be found that the cycle from theory to practice and then to theory is a process of interaction and improvement between motor designers, producers, and testers. As long as those engaged in motor design can concentrate on accumulation and research, there is still great potential for everyone.
