Stator Core Resonance Control via Adhesive Stack Strength
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Solution Overview
Problem
Existing electric rotary machines face challenges in reducing resonance levels to improve quietness, as the ring and bending resonance frequencies often overlap, making it difficult to suppress excitation force and resonance without significant remodeling or efficiency loss.
Innovation Solution
A method for manufacturing a stator by adjusting the bending resonance frequency of the stator core by varying the stack strength of steel plates through controlled adhesive application and thermal deterioration, ensuring it does not overlap with the ring resonance frequency, thereby simplifying the process to reduce resonance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of caulking points or welding method is changed to adjust bending resonance frequency, then the bending resonance frequency can be changed, but large-scale remodeling of equipment is required and efficiency deteriorates
Solution Approach 1:
The patent changes the bonding strength parameter of the adhesive to adjust the bending resonance frequency. By selecting adhesives with different bonding strengths or changing bonding conditions, the bending resonance frequency can be adjusted without requiring large-scale equipment remodeling, thus resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent uses adhesive bonding instead of permanent mechanical fastening or welding. The adhesive can be easily replaced or adjusted if resonance frequency adjustment is needed, avoiding the need for complex equipment remodeling. This disposable-like approach to bonding resolves the contradiction by providing an easily changeable solution
2Strength
If adhesive amount is increased to improve stack strength, then bending resonance frequency changes, but manufacturing process becomes more complex
Solution Approach 1:
The patent changes the bonding strength parameter of the adhesive to adjust the bending resonance frequency. By selecting adhesives with different bonding strengths or changing bonding conditions, the bending resonance frequency can be adjusted without requiring large-scale equipment remodeling, thus resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent applies adhesive to specific portions of the steel plates rather than uniformly across all surfaces. This partial action approach allows adjustment of bonding strength and bending resonance frequency without requiring complex manufacturing processes, resolving the contradiction between strength improvement and process 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
This approach effectively suppresses the resonance level of the electric rotary machine, enhancing its quietness by easily adjusting the bending resonance frequency without large-scale remodeling or efficiency deterioration.
Implementation Method 1
forming the stator core by stacking and fixing the plurality of steel plates with an adhesive
Implementation Method 2
changing a stack strength of the stator core by deteriorating the adhesive such that a bending resonance frequency
Data Source
AI summary
A method for manufacturing a stator for an electric rotary machine including a stator core formed by stacking a plurality of steel plates and a coil attached to the stator core, the method includes forming the steel plates, forming the stator core by stacking and fixing the plurality of steel plates with an adhesive, attaching the coil to the stator core, and changing a stack strength of the stator core, by deteriorating the adhesive such that a bending resonance frequency of the stator does not overlap with a pre-measured circular resonance frequency of the stator, the bending resonance frequency varying depending on the stack strength of the plurality of steel plates.