Speaker Eddy Current Suppression via Insulated Wire Winding
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Solution Overview
Problem
Existing speaker technologies face limitations in improving sound quality due to eddy currents generated during voice coil activation, with high manufacturing costs and incomplete eddy current suppression in existing solutions, and potential deterioration in sound quality from magnetic field weaknesses.
Innovation Solution
The use of an insulation coated conductor wire wound around the outer circumferential surfaces of the magnet, yoke, center pole, and plate to equalize (+) and (-) potentials, thereby eliminating eddy currents and improving voice coil responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conductive material such as iron with high permeability is used for the magnetic circuit, then magnetic flux can be effectively generated, but eddy currents are generated that cause distortion of voice coil current and deterioration in sound quality
Solution Approach 1:
The magnetic circuit is divided into multiple segments: a center pole made of conductive material (iron) for effective magnetic flux generation, and peripheral portions made of non-conductive material (resin) to suppress eddy currents. This segmentation allows each part to fulfill its specific function - the center pole generates magnetic flux while the resin portions block eddy current paths.
Solution Approach 2:
Different materials are used in different locations of the magnetic circuit based on local requirements. The center pole uses high-permeability conductive material where magnetic flux generation is critical, while the peripheral portions use non-conductive resin material where eddy current suppression is prioritized. This local differentiation resolves the contradiction between magnetic flux generation and eddy current suppression.
2Object-generated harmful factors
If iron powder bond is used to reduce eddy current, then eddy current is suppressed, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of using expensive iron powder bond material, the invention uses ordinary resin material that is cheaper and easier to manufacture. The resin is molded into the magnetic circuit structure, providing eddy current suppression without the complex manufacturing processes required for iron powder bond materials.
Solution Approach 2:
The invention replaces the material substitution approach (using iron powder bond) with a structural substitution approach (molding resin into the magnetic circuit). This structural approach achieves eddy current suppression through the non-conductive nature of resin while avoiding the manufacturing complexity associated with iron powder bond materials.
3Object-generated harmful factors
If center pole is removed to suppress eddy current, then eddy current is reduced, but magnetic field strength decreases and sound quality deteriorates
Solution Approach 1:
The magnetic circuit is segmented into a center pole and peripheral portions with different material properties. The center pole retains its conductive material to maintain strong magnetic field generation, while the peripheral portions use non-conductive material to suppress eddy currents. This segmentation allows simultaneous achievement of strong magnetic field and eddy current suppression.
Solution Approach 2:
Different material properties are assigned to different locations: the center pole uses conductive material for magnetic field strength, while peripheral portions use non-conductive material for eddy current suppression. This local quality differentiation resolves the contradiction between maintaining magnetic field strength and reducing eddy currents.
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 eddy currents, enhancing sound quality by correcting current distortions and improving voice coil responsiveness, while reducing manufacturing complexity and costs.
Implementation Method 1
an AC magnetic field crosses the magnetic circuit by a magnetic field generated from the voice coil and generates an eddy current in a direction to obstruct a change in the magnetic circuit
Implementation Method 2
when a current is flowed in the voice coil, an AC magnetic field crosses the magnetic circuit by a magnetic field generated from the voice coil
Data Source
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AI summary
[Object] To provide a speaker device and a method for improving sound quality of a speaker device capable of improving sound quality by suppressing generation of an eddy current that is generated during activation of a voice coil. [Solution Means] A speaker device 101 includes vibrating body components constituting a vibrating body, consisting of at least a voice coil 119, a diaphragm 106, and a frame 102, and magnetic circuit components constituting a magnetic circuit, consisting of at least a plate 103, a yoke 104, a magnet 105, and a center pole 112. By winding an insulation coated conductor wire 120 around an outer circumference of any of the magnetic circuit components and connecting one end and the other end of the insulation coated conductor wire, a current flows in the insulation coated conductor wire 120 and makes (+) potentials and (-) potentials that are mixed on the surface of the magnetic circuit component and cause an eddy current equal to each other instantaneously, so that generation of an eddy current can be suppressed. Therefore, distortion of a current due to an eddy current can be corrected, responsiveness of the voice coil 119 can be improved, and sound quality of the speaker device 101 can be improved.