Whether it's a motor manufacturer or a parts processing company, the placement of parts is an unavoidable issue. If placed properly, the parts will not be damaged; if placed improperly, it will affect the performance of the parts and the whole machine, and will also have an adverse impact on the production site.
For example, there are a relatively large number of parts such as bearing covers and small end caps for motors. Unrefined manufacturers will use a large sack to pack them, resulting in a messy pile that is difficult to count or see clearly. However, conscientious manufacturers will take necessary measures to facilitate storage and transportation.
The storage of motor components is a delicate matter. For example, the motor base is best stored vertically to avoid incompatibility issues with the stop and inner diameter, especially for thin-walled bases, where horizontal stacking exacerbates the problem. Given the performance requirements of the entire motor, manufacturers should establish standardized requirements for the storage and transportation of components, as component conformity is a prerequisite for improving the overall performance of the product.
1. Why do motor parts deform?
Designing motor components is a very demanding task. It is not easy to make the base and end caps lightweight, aesthetically pleasing, and non-deformable. Problems may occur in the design stage, the manufacturing stage, or the storage stage. Ms. would like to share her thoughts with you.
●Structural Design. Failure to fully adhere to structural mechanics principles in component design, such as inadequate dimensions, shapes, and positions of axial and radial ribs on the base, or overall design imbalances, can lead to problems. This includes issues with the distribution of reinforcing ribs in plate-shaped end caps and the design of perforated windows in protective motor end caps.
● Processing reasons. For cast iron parts, the blank should have sufficient aging treatment before processing can begin; during metalworking, uneven stress at the clamping points causes the machine base to deform due to rebound after the clamping points are loosened.
● Improper storage. Compared with other parts, the storage requirements for machine bases are relatively more stringent. We recommend that machine bases be placed vertically. This allows for stacking in a certain number of layers, saving space and preventing deformation. Conversely, if horizontal placement is used, especially multi-layer stacking, the deformation of the machine base will be particularly severe, mainly including elliptical edges and inner bores or misalignment between the machine bases.
2. Adverse effects of base deformation
Because of the resonance phenomenon during motor operation, which often occurs at a certain speed and is fleeting during startup, deformation of the motor base is not easily detected. Deformation caused by inadequate aging is also difficult to detect. If it is a welded motor base, the welding stress requires a long time to fully release, making it difficult to detect during processing. This is a typical quality hazard.
If the coaxiality of the two stops of the motor base is out of tolerance, the bearings at both ends of the motor will fail prematurely because they cannot operate normally on the same axis. This will cause uneven air gaps between the stator and rotor, resulting in vibration and electromagnetic noise.
If the feet are not on the same plane, it can easily disrupt the coaxiality between the foot and the driven equipment. If the foot is forcibly held in place by the foot bolts, it can easily cause the foot to break.
The frame is prone to uneven radial deformation. If the frame shrinks unevenly at the core due to deformation, the stator core will be subjected to uneven radial force. The more poles a motor has, the greater the deformation due to the narrow stator yoke. In addition, the air gap is smaller than that of 2- or 4-pole motors, so the stator rubbing problem is more likely to occur.
