First, the reason for loosening

During the operation of the motor, the iron core punching film is thermally expanded during the operation of the motor, and the paint film on both sides of the punching film is flattened and pressed under the thermal expansion force, and the bonding structure between the sheets is collapsed, and the iron core punching piece is generated. Loose. After the iron core is loosened, vibration will be generated between the punching sheets, so that the insulating layer of the punching sheet is further worn, and the loosening gap of the iron core punching sheet tends to be stable. Obviously, only the loose gap caused by the thermal expansion force is not enough to cause noise failure, but once superimposed with abnormal factors, the problem is complicated and highly randomized.

Second, the method of preventing loosening

From years of experience in the production and testing of motors, it has been found that there are few problems with the loosening of the chips due to the later use of the motor, and most of the motors can be found in the production process.

Generally, when the motor core is laminated, the iron core is harmful to looseness. There are two factors: one is that the punching piece has burrs or unevenness, and the iron core weight control must be used to avoid the problem; the second is that the stacking pressure is in an uncontrolled state. The pressure lamination must be strictly in accordance with the operating specifications under the premise of ensuring that the pressure of the pressure equipment is normal.

For most motor manufacturers, especially after cold heat generation, due to the quality reliability of the silicon steel sheet itself, the small-size iron core has eliminated the end plate, generally ensuring the weight of the iron core can ensure that the iron core does not bounce off. However, for large-size products, especially those with radial air ducts, due to the special characteristics of the manufacturing process, if the iron weight is still premised, the problem of loosening of the core and loosening of the punching often occurs, according to the number of pieces. Control is the most effective means.

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