Sound Diffuser Transducer With Moving-Magnet Low-Energy Architecture
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Solution Overview
Problem
Existing sound diffusers face challenges with increased dimensions, weight, and energy consumption due to the movement of magnets, leading to inefficiencies and high costs, particularly when power requirements are high.
Innovation Solution
A transducer design with a single coil wound around a central ferromagnetic core, featuring an air gap and permanent magnets, allows for high mechanical movements and forces with low energy consumption, maintaining compact dimensions by optimizing magnetic field interaction and using a radial architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power required for operation of the sound diffuser is increased, then the sound output performance is improved, but the mass of the magnets increases and dimensions grow considerably
Solution Approach 1:
The patent inverts the conventional transducer design by making the coil stationary and the magnets movable. This inversion allows the magnetic field to be generated in a fixed position while the magnetic elements move to drive the sound membrane, resolving the contradiction between power output and magnet mass by decoupling field generation from motion.
Solution Approach 2:
The patent replaces the conventional mechanical movement of coils through magnetic fields with a system where magnets move within a stationary magnetic field. This substitution reduces mechanical complexity and allows for more efficient energy conversion, improving power output without proportionally increasing magnet mass.
2Power
If the power required for operation of the sound diffuser is increased, then the sound output performance is improved, but the dimensions and weight of the device increase considerably
Solution Approach 1:
By inverting the transducer design so that coils are stationary and magnets move, the patent compactifies the overall structure. The stationary coil assembly can be optimized for space efficiency, while the moving magnets traverse a smaller range within a compact housing, reducing overall device dimensions while maintaining high power output capability.
Solution Approach 2:
The patent utilizes the air gap space between the stationary coil and moving magnets in three-dimensional space efficiently. By arranging the magnetic circuit and coil structures to maximize utilization of available space in all dimensions, the design achieves high power output within a compact form factor.
3Power
If the power required for operation of the sound diffuser is increased, then the sound output performance is improved, but the energy consumption increases
Solution Approach 1:
The patent replaces the energy-intensive movement of coils through magnetic fields with a system where magnets move within a stationary magnetic field. This substitution reduces energy losses associated with coil inertia and electrical resistance, improving energy efficiency while maintaining high power output.
Solution Approach 2:
The patent converts the potential harm of high energy consumption into benefit by optimizing the magnetic circuit design. The stationary coil generates a persistent magnetic field that efficiently interacts with moving magnets, converting electrical energy to mechanical motion with minimal losses, thus achieving high power output with reduced energy consumption.
4Power
If the mass of magnets is increased to increase power, then the sound output is improved, but the movement becomes particularly complex and onerous in terms of energy consumption
Solution Approach 1:
By inverting the design so magnets move rather than coils, the patent simplifies the mechanical system. The moving magnets can be directly coupled to the sound membrane or a simple mechanical linkage, eliminating complex coil suspension and guidance mechanisms while maintaining high power output capability.
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 transducer achieves efficient sound diffusion with reduced energy consumption and compact size, enabling extended frequency response and balanced mechanical vibrations.
Implementation Method 1
The magnet is movable, inside the air gap, along a movement direction parallel to the longitudinal axis. The movement of the magnet along the movement direction is induced by a magnetic energizing field generated by energizing the coil
Implementation Method 2
at least one permanent magnet located inside the air gap. The magnet has a first end and a second end. The magnet has a south pole and a north pole extending between the first end and the second end parallel to the longitudinal axis
Data Source
AI summary
A sound diffuser includes a housing and a transducer inside the housing. The transducer includes: a coil including a plurality of turns, each lying on a respective plane (γ) transverse to a longitudinal axis; a ferromagnetic circuit, including a core provided with a central portion around which the coil is wound and an outer lateral portion located at the side of the coil and at least partly surrounding the coil, the outer lateral portion being separated from the core by an air gap extending longitudinally; and a permanent magnet inside the air gap that is caused to move parallel to the longitudinal axis when the coil is electrically energized. The sound diffuser includes a radiator coupled to the magnet so that longitudinal movement of the magnet parallel to the axis corresponds to longitudinal oscillation of the radiator along the axis.