Laminated Stator Core Adhesive Damping for Quieter Motors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motors experience loud noise and significant vibration, particularly in multi-pole configurations, and over-molding to reduce these issues increases production costs.
Innovation Solution
A motor design incorporating a stator core formed by stacking sheets with holes filled by an adhesive member, such as glue, to reduce noise and vibration, utilizing an anaerobic adhesive with viscosity between 125 mPa.s and 800 mPa.s to penetrate between the sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If over-molding is applied to reduce noise and vibration, then noise and vibration are reduced, but production cost increases
Solution Approach 1:
The stator core is segmented into multiple thin sheets stacked together, with adhesive members positioned at specific locations (holes) between the sheets. This segmentation allows targeted application of adhesive to reduce noise and vibration without requiring complete over-molding of the entire stator core, thereby reducing production costs while maintaining effectiveness.
Solution Approach 2:
Instead of uniformly over-molding the entire stator core, adhesive members are selectively applied at specific local positions (holes) between the sheets. This local quality approach focuses the noise and vibration reduction function where it is most needed, avoiding the increased production cost associated with complete over-molding while still achieving the desired reduction in noise and vibration.
2Productivity
If sheets are stacked to form a stator core, then production efficiency is improved, but noise and vibration increase
Solution Approach 1:
The stator core is divided into multiple thin sheets that are stacked together, which improves production efficiency through standardized manufacturing and assembly. The segmentation into sheets with strategically placed adhesive members at holes between them resolves the noise and vibration issue that would otherwise result from simple stacking, achieving both production efficiency and noise reduction.
Solution Approach 2:
Adhesive members are introduced as intermediary elements between the stacked sheets. These adhesive members serve as mediators that eliminate the harmful noise and vibration generated by the stacked sheet structure, while maintaining the production efficiency benefits of the stacked configuration. The adhesive fills the gaps and secures the sheets without requiring complex over-molding processes.
3Object-affected harmful factors
If adhesive member is used to reduce noise and vibration, then noise and vibration are reduced, but manufacturing complexity increases
Solution Approach 1:
The use of adhesive members is combined with the segmentation of the stator core into sheets with holes. This segmentation allows the adhesive to be applied in a standardized, repeatable manner during the stacking process, preventing the manufacturing complexity from becoming excessive while still achieving noise and vibration reduction.
Solution Approach 2:
The adhesive members are designed to be applied through holes in the sheets during the normal stacking process, allowing the structure to assemble itself with the adhesive in place. This self-service approach integrates the noise reduction function into the existing manufacturing process without requiring separate complex application steps, thereby limiting the increase in manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces noise and vibration while maintaining production efficiency by using an adhesive to fill holes in the stator core, achieving a robust motor structure.
Implementation Method 1
an adhesive member disposed in the plurality of holes... reducing noise and vibration
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An embodiment relates to a motor comprising: a shaft; a rotor engaged with the shaft; and a stator disposed outside the rotor, wherein the stator includes a stator core formed by stacking a plurality of sheets and a coil wound around the stator core, the stator core including a yoke having a hole formed therein, a tooth protruding radially from the yoke, and an adhesive member disposed in the hole, the hole being disposed on an imaginary line L extending radially along the side of the tooth. Accordingly, the motor can form a stator core by stacking sheets, and reduce noise and vibration by filling an adhesive member in a hole formed in the stator core.