Laminated Core Adhesion Pattern to Prevent Motor Resonance Matching
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Solution Overview
Problem
Conventional laminated cores in electric motors suffer from vibration and noise issues due to resonance frequency matching, which affects motor characteristics.
Innovation Solution
A laminated core design featuring electrical steel sheets stacked with non-overlapping adhesion parts in a specific arrangement, reducing strain and resonance frequency matching by varying the adhesion regions and using a room temperature adhesion type acrylic-based adhesive with controlled tensile modulus and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesion parts are provided on the entire surface of the stacking surface, then adhesion strength is improved, but strain on the electrical steel sheet increases causing deterioration of magnetic properties
Solution Approach 1:
The adhesion part is segmented into multiple discrete regions rather than covering the entire surface. The adhesion parts are arranged at specific intervals on the stacking surface, creating a patterned distribution that reduces continuous strain on the electrical steel sheet while maintaining adequate adhesion strength.
Solution Approach 2:
Adhesion is applied locally at specific regions rather than uniformly across the entire surface. The adhesion parts are positioned at optimized locations that provide sufficient bonding while minimizing the affected area and corresponding strain on the magnetic material.
2Strength
If adhesion parts are arranged in overlapping patterns, then adhesion strength is improved, but resonance frequency matching occurs causing vibration and noise
Solution Approach 1:
The arrangement of adhesion parts introduces asymmetry in the stacking pattern. By varying the positions of adhesion parts in different layers rather than using a symmetric overlapping pattern, the resonance characteristics are altered to avoid matching with motor operating frequencies, thereby reducing vibration and noise.
Solution Approach 2:
The positions of adhesion parts are pre-designed and pre-positioned in specific non-overlapping patterns before assembly. This preliminary arrangement ensures that the resonance frequency is shifted away from problematic ranges, preventing vibration and noise issues before the motor operates.
3Reliability
If adhesion parts are reduced in size, then strain on electrical steel sheet is reduced improving magnetic properties, but adhesion strength decreases
Solution Approach 1:
Multiple small adhesion parts are distributed across the stacking surface rather than using a single large adhesion part. By combining the effect of multiple smaller adhesion regions, sufficient total adhesion strength is achieved while each individual part remains small enough to minimize localized strain on the electrical steel sheet.
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 enhances motor characteristics by reducing vibration and noise, improving magnetic properties and dispersing strain uniformly, thereby preventing resonance frequency matching between the motor and laminated core.
Implementation Method 1
an adhesion part provided between electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other
Implementation Method 2
an adhesive shrinks as it cures. Therefore, compressive stress is applied to the electrical steel sheet as the adhesive cures
Data Source
AI summary
A laminated core includes a plurality of electrical steel sheets stacked on each other, and an adhesion part provided between electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other, wherein the adhesion part partially adheres the electrical steel sheets adjacent to each other in the stacking direction, and the adhesion parts adjacent to each other in the stacking direction have different arrangement regions in a plan view seen in the stacking direction.