Speaker Magnetic Permeability Slits for Eddy Current Reduction
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Solution Overview
Problem
Speakers experience eddy current and second harmonic distortion due to magnetic field interactions, which are typically addressed by adding a short circuit ring, increasing production costs and complexity.
Innovation Solution
Incorporating slits of alternating depths on the magnetic permeability components, such as the T-yoke and washer, to disrupt the eddy current loop and minimize magnetic field disruption, thereby reducing eddy current loss and harmonic distortion without the need for a short circuit ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a short circuit ring is mounted to eliminate eddy current and second harmonic distortion, then the acoustic performance is improved, but the production cost increases and the assembly complexity increases
Solution Approach 1:
The magnetic permeability piece is segmented by providing multiple slits that extend in the horizontal direction, dividing the continuous magnetic path into separate sections. This segmentation prevents the formation of closed eddy current loops while maintaining magnetic flux continuity through the vertical extension of the slits, thereby eliminating the need for an additional short circuit ring component
Solution Approach 2:
The anti-eddy current function is merged into the magnetic permeability piece itself by integrating the slits directly into its structure. This combines the magnetic flux conduction function and the eddy current suppression function into a single component, reducing the total component count and eliminating the need for a separate short circuit ring
2Object-affected harmful factors
If a short circuit ring is mounted to eliminate eddy current, then the acoustic performance is improved, but the production efficiency decreases
Solution Approach 1:
The magnetic permeability piece is segmented by providing multiple slits that extend in the horizontal direction, dividing the continuous magnetic path into separate sections. This segmentation prevents the formation of closed eddy current loops while maintaining magnetic flux continuity through the vertical extension of the slits, thereby eliminating the need for an additional short circuit ring component
Solution Approach 2:
The anti-eddy current function is merged into the magnetic permeability piece itself by integrating the slits directly into its structure. This combines the magnetic flux conduction function and the eddy current suppression function into a single component, reducing the total component count and eliminating the need for a separate short circuit ring
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 solution effectively reduces eddy current loss, enhances high-frequency efficiency, and improves acoustic performance while simplifying assembly and reducing production costs by eliminating unnecessary components.
Implementation Method 1
An eddy current will be generated in the washer, the magnet and the magnetic permeability piece by the modulated magnetic field
Implementation Method 2
An induced electromotive force will be generated while the skeleton voice coil makes up and down movement in the magnetic field
Implementation Method 3
A magnetic gap is provided between the washer and the magnet and a magnetic permeability piece
Data Source
AI summary
The present invention discloses a speaker relating to the technical field of electro-acoustic products, including a housing in which a vibration system and a magnetic system are contained, the magnetic system including a magnet and a magnetic permeability piece combined together, several slits are provided on at least one component of the magnet and the magnetic permeability piece, the depths of the respective slits all extend in a horizontal direction and the lengths of the respective slits all extend in a vertical direction. The speaker of the present invention solves the technical problems in prior art of more components, high cost, difficult assembly etc. of the speaker. The speaker of the present invention also has the advantages of less components, low production cost, simple assembly and easy operation, high production efficiency, a high qualified rate of the end product, a remarkable acoustic performance, etc. while solving the technical problems of the eddy current loss and second harmonic distortion, etc.