Loudspeaker Core Cap Offset Grooves Magnetic Flux
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Solution Overview
Problem
The existing core cap design in loudspeakers with shell-pot design reduces the ability to carry magnetic flux due to increased magnetic reluctance caused by adhesive control grooves, leading to magnetic saturation and reduced flux density in the working air gap.
Innovation Solution
The improved core cap design features offset adhesive control grooves, reducing the cross-sectional reduction and effectively increasing the magnetic flux capacity by approximately 50% while maintaining assembly error-proofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive control grooves are added to the core cap to prevent adhesive squeezing out, then assembly reliability is improved, but magnetic flux carrying capacity deteriorates due to increased reluctance
Solution Approach 1:
The patent transitions from having grooves on both faces of the core cap (two-dimensional distribution) to having grooves on only one face (one-dimensional distribution). This dimensional change reduces the total groove cross-sectional area, thereby reducing magnetic reluctance while preserving the adhesive control function through strategic positioning of grooves on a single face.
Solution Approach 2:
The patent applies local quality by strategically positioning adhesive control grooves on only one face of the core cap rather than uniformly distributing them on both faces. This localized approach concentrates the adhesive control function where it is most effective while minimizing the impact on magnetic flux capacity in other regions.
2Manufacturing precision
If adhesive control grooves are positioned to prevent adhesive leakage, then manufacturing precision is improved, but magnetic flux density in the working air gap deteriorates
Solution Approach 1:
The patent extracts the adhesive control function from both faces of the core cap and concentrates it on a single face. By taking out the groove configuration from the traditional two-face arrangement and relocating it to one face, the design maintains adhesive control precision while extracting the magnetic flux path disruption to a minimal extent.
3Ease of manufacture
If core cap cross-section is reduced to accommodate grooves, then adhesive reservoir function is improved, but magnetic reluctance increases
Solution Approach 1:
The patent applies partial action by providing adhesive control grooves on only one face of the core cap rather than both faces. This partial implementation of the groove function is sufficient to achieve adhesive reservoir capability while avoiding the excessive reduction of cross-sectional area that would occur with grooves on both faces, thereby minimizing the increase in magnetic reluctance.
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 offset grooves enhance the magnetic flux density in the working air gap, reducing magnetic leakage and fringing, and maintaining the advantages of adhesive reservoir and assembly orientation error-proofing.
Implementation Method 1
a magnetic circuit 102 that produces a stationary magnetic field of high flux density in a narrow, working air gap 104
Implementation Method 2
A force induced by the interaction between the current carried in the voice coil 106 and the magnetic flux in the air gap 104 actuates an assembly 108
Implementation Method 3
the core cap 122 and shell-pot 118 each provide a path from the opposite poles of the permanent magnet 120 for carrying and directing the magnetic field into the air gap 104
Data Source
AI summary
A core cap or top plate for use with loudspeakers that includes offset adhesive control grooves on the opposite faces of the disk-like core cap is disclosed. The grooves are offset from one another by a distance that makes the smallest dimension between any feature of the grooves about the same as the nominal thickness of the core cap. The core cap increases the magnetic flux capacity over prior art core cap designs, while maintaining features advantageous to error-proof the orientation of the core cap in the loudspeaker.