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Consequences of misalignment of stator and rotor cores

source:未知   time:2024-07-08 09:05nbsp;  click:


The users of the motor are more concerned about the application effect of the motor, while the manufacturers and repairers of the motor are more concerned about the whole process of motor production and repair. Only by handling every link well can the overall performance level of the motor meet the requirements.
 
Among them, the matching relationship between the stator core and the rotor core is an important part of quality control. Under normal circumstances, after the motor is assembled and even during the operation of the motor, the stator core and the rotor core of the motor should be completely aligned in the axial direction.
 
It is an ideal state that the stator and rotor cores are the same and ensure that the motor is completely aligned during operation. In the actual production or repair process, there will always be some uncertain factors that cause the two to be misaligned, such as the positioning size of the stator core or the rotor core does not meet the requirements, the core has horseshoe phenomenon, the core has bounced open, the core stacking is loose, etc. Any problem with the stator or rotor core will cause the effective iron length or iron weight of the motor to not meet the requirements.
 
On the one hand, this problem can be discovered through strict process inspection. Another link, which is also a very critical link, is to screen each unit through the no-load test in the inspection test, that is, to discover the problem through the change of the no-load current. Once the no-load current of the motor is found to exceed the assessment range during the test, necessary project inspections must be carried out, such as the outer diameter of the rotor, whether the stator and the rotor are aligned, etc.
 
When checking whether the stator and the rotor of the motor are aligned, the method of fixing one end and disassembling one end is generally adopted, that is, keeping the end cover and the base of one end of the motor in a normal tightening state, opening the other end of the motor, and checking whether the stator and rotor cores of the motor are misaligned. Then further check the cause of the misalignment, such as checking whether the iron length of the stator and the rotor is consistent, and checking whether the positioning size of the iron core is correct.
 
This type of problem mostly occurs in the production and manufacturing process of motors with the same center height and the same number of poles but different power levels. Some motors may be equipped with a rotor longer than the normal iron core before leaving the factory, and it is not easy to find it during the inspection and test process. When the motor is equipped with an iron core shorter than the normal iron length, the problem can be found during the inspection and test.
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