Dual-Frame Loudspeaker Basket for High-Power Magnetic Support
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Solution Overview
Problem
Increasing the power handling of a loudspeaker while minimizing the weight and cost of the magnetic structure, as heavier magnetic structures increase stress on the basket and can cause distortion.
Innovation Solution
A dual-frame speaker basket design with a main frame and a support frame, where the support frame is positioned inside the main frame to provide additional structural support for high-power transducers, reducing distortion and maintaining the integrity of the magnetic circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the surface area of the voice coil is increased to increase power handling, then the power handling capability is improved, but the mass of the permanent magnetic circuit increases
Solution Approach 1:
The basket is divided into two separate frames: a first frame that couples to the permanent magnetic circuit and a second frame that provides additional structural support. This segmentation allows the basket to be optimized for supporting heavy magnetic structures without increasing the magnetic circuit's mass, while maintaining the voice coil's power handling capability through the distributed structural support of the two-frame system.
2Power
If the mass of the permanent magnetic circuit is increased to support higher power, then the power handling is improved, but the stress on the basket increases
Solution Approach 1:
The basket structure is segmented into a first frame for coupling to the magnetic circuit and a second frame for providing additional support. This segmentation distributes the mechanical stress from heavier magnetic structures across two frames, preventing excessive stress concentration on any single component while maintaining the ability to support high-power applications.
Solution Approach 2:
The second frame is nested inside the first frame, creating a concentric structure where the inner frame provides additional structural support to the outer frame. This nested configuration strengthens the basket's ability to handle stress from heavier magnetic circuits without increasing the overall footprint or compromising the magnetic circuit's gap integrity.
3Device complexity
If a single-frame basket is used, then the device complexity is low, but the structural integrity under heavy loads deteriorates
Solution Approach 1:
The basket is segmented into two frames with distinct functional roles: the first frame couples to the permanent magnetic circuit while the second frame provides additional structural support. This segmentation improves structural integrity under heavy loads by distributing mechanical stresses, while the modular nature of the two frames keeps the overall device complexity manageable and manufacturable.
Solution Approach 2:
The nested configuration of the second frame inside the first frame creates a compact, efficient structure that maximizes structural integrity without excessive complexity. The nested design allows the inner frame to reinforce the outer frame's structure, providing enhanced stability for heavy magnetic circuits while maintaining a relatively simple overall geometry that is easy to manufacture.
Data Source
AI summary
A loudspeaker including a speaker basket. The speaker basket includes a first frame including an inner surface and an outer surface opposite the inner surface, and a second frame housed in the first frame. The second frame includes a first wall and a second wall, wherein the first wall and the second wall of the second frame engage the inner surface of the first frame.