Cuboid Magnet Assembly with Rectangular-Ring Gap for Loudspeakers
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Solution Overview
Problem
Compact loudspeakers face efficiency challenges due to their small size and light weight, requiring improved magnet assemblies to optimize performance in limited spaces such as consumer electronics and automotive applications.
Innovation Solution
A magnet assembly featuring a first and second cuboid-shaped permanent magnet positioned coaxially with a rectangular-ring shaped gap, along with soft-magnetic base and pole pieces to focus magnetic flux in a voice coil gap, enhancing magnetic flux concentration and sound pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the loudspeaker size is reduced for compact applications, then the loudspeaker can be used in limited spaces such as consumer electronics and automotive applications, but the efficiency and sound pressure level deteriorate
Solution Approach 1:
The magnet assembly is segmented into multiple permanent magnets (first permanent magnet and second permanent magnet) arranged in a specific configuration. This segmentation allows the magnetic flux to be concentrated in the gap region, achieving high efficiency and sound pressure level in a compact loudspeaker volume.
Solution Approach 2:
The patent transitions from a conventional single magnet configuration to a multi-dimensional arrangement with first and second permanent magnets positioned at different locations, creating a rectangular-ring shaped gap. This dimensional change enables concentrated magnetic flux in a small volume, improving efficiency without increasing overall loudspeaker size.
2Volume of moving object
If the loudspeaker size is reduced for compact applications, then the loudspeaker can be used in limited spaces, but the sound pressure level deteriorates
Solution Approach 1:
The magnetic flux is concentrated locally in the rectangular-ring shaped gap between the first and second permanent magnets. This local concentration of magnetic flux density in the gap region directly improves the sound pressure level generated by the voice coil, achieving high acoustic output despite the compact overall loudspeaker size.
Solution Approach 2:
The voice coil acts as an intermediary between the magnetic field and the diaphragm. By positioning the voice coil in the concentrated magnetic flux region of the rectangular-ring shaped gap, the magnetic flux concentration is translated into efficient electromagnetic force generation, which drives the diaphragm to produce high sound pressure levels in the compact loudspeaker.
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 solution achieves higher sound pressure levels and optimized performance in compact loudspeakers by concentrating magnetic flux, addressing the efficiency drawbacks of small-sized loudspeaker designs.
Implementation Method 1
a first permanent magnet with a cuboid shape, the first magnet encompassing a central opening, and a second permanent magnet with a cuboid shape, the second magnet positioned coaxially within the opening of the first magnet and forming a rectangular-ring shaped first gap therebetween
Implementation Method 2
a soft-magnetic base plate connected across one side of the first and second magnets, a soft-magnetic first pole piece having a first face and positioned on the first magnet, and a soft-magnetic second pole piece having a second face and positioned on the second magnet
Implementation Method 3
a voice coil connected to the diaphragm, and a magnet assembly defining a flux gap, wherein the voice coil is positioned in the flux gap
Data Source
AI summary
An example magnet assembly for a loudspeaker includes a first permanent magnet with a cuboid shape, the first magnet encompassing a central opening, and a second permanent magnet with a cuboid shape, the second magnet positioned coaxially within the opening of the first magnet and forming a rectangular-ring shaped first gap therebetween, the first and second magnets being axially poled in opposed directions. The assembly further includes a soft-magnetic base plate connected across one side of the first and second magnets, a soft-magnetic first pole piece having a first face and positioned on the first magnet, and a soft-magnetic second pole piece having a second face and positioned on the second magnet. The first pole piece and the second pole piece form a rectangular-ring shaped second gap between the first and second faces such that magnetic flux is focused in the second gap.