Dual Ring Magnet Speaker Driver Magnetic Circuit
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Solution Overview
Problem
Traditional magnetic circuit designs for speaker drivers suffer from non-uniform magnetic field distributions and misalignment issues, leading to distortions, rocking modes, and audible distortions due to non-orthogonal magnetic field lines and varying magnetic field strengths.
Innovation Solution
A magnetic assembly comprising an inner and outer magnet, caps, and a washer creates a zone with a substantially uniform magnetic field strength and direction perpendicular to the ideal motion direction of a voice coil, allowing for a more aligned and stable voice coil movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional single ring magnet design is used, then the device complexity is low, but the magnetic field uniformity and orthogonality deteriorate, causing voice coil misalignment and distortion
Solution Approach 1:
The single ring magnet is divided into two separate ring magnets (inner and outer magnets) with different polarities. This segmentation allows each magnet to contribute to creating a more uniform and orthogonal magnetic field in the gap region, resolving the contradiction by improving field quality through structural division rather than using a single complex magnet assembly
Solution Approach 2:
The inner and outer magnets are positioned at specific locations with optimized dimensions and polarities to create a localized zone of uniform magnetic field between them. This local optimization of magnetic field properties in the critical gap region improves voice coil alignment without requiring the entire magnetic circuit to be reconfigured
2Power
If the magnetic field strength is increased to improve force output, then the power increases, but the magnetic field non-uniformity worsens, causing greater distortion
Solution Approach 1:
The invention optimizes parameters including the dimensions, polarities, and spacing of the inner and outer magnets to achieve a balance between magnetic field strength and uniformity. By carefully controlling these parameters, the system maintains strong magnetic field intensity while ensuring uniform distribution and orthogonality in the operational gap region
3Force
If the voice coil is positioned to maximize magnetic field interaction, then the force output improves, but misalignment with the magnetic field direction occurs, causing rocking modes and distortion
Solution Approach 1:
The dual magnet configuration creates a magnetic field region where the field lines are substantially orthogonal to the voice coil motion direction across the entire operational range. This equipotential-like uniformity in field orientation ensures the voice coil experiences consistent directional force without lateral components that would cause misalignment or rocking modes
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 design minimizes distortions and misalignment issues, providing a uniform magnetic field for the voice coil, reducing rocking modes and improving audio quality by ensuring the voice coil operates within a consistent magnetic environment.
Implementation Method 1
If an alternating current passes through the traditional voice coil 110, a Lorentz force is generated in response to the alternating current and the magnetic field. The Lorentz force acts on the traditional voice coil 110, causing the traditional voice coil 110 to move through the magnetic field.
Data Source
AI summary
An apparatus related to a magnetic circuit design is disclosed. The apparatus includes a magnetic assembly and an electrically-conductive mobile member. The magnetic assembly includes an inner magnet, an outer magnet, an inner cap, an outer cap and a washer. The magnetic assembly is configured to produce a magnetic field having a zone of operation between the inner cap and the outer cap. The zone of operation has substantially uniform magnetic field strength. The zone of operation has magnetic field directions substantially perpendicular to an ideal motion direction. The electrically-conductive mobile member is disposed in the zone of operation of the magnetic field and electrically coupled to a diaphragm of a driver. The electrically-conductive mobile member is configured to move within the zone of operation of the magnetic field in response to the magnetic field when an alternating current is passed through the electrically-conductive mobile member.