Automotive Speaker Thermal Management via Partition Wall Heatsink
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Solution Overview
Problem
Speakers installed in high-temperature environments, such as engine compartments, face issues with overheating, which can lead to voice coil loosening and magnet demagnetization due to inadequate heat dissipation.
Innovation Solution
A speaker design featuring a metal partition wall as a heatsink, with an elastically deformable thermal conductive sheet sandwiched between the partition wall and the magnetic circuit's end surface, efficiently dissipating heat generated by the voice coil and magnetic circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a speaker is installed in a high-temperature environment such as an engine compartment, then the available space in the vehicle is efficiently utilized, but the temperature of the voice coil becomes excessively high causing the voice coil to become loose and the magnet to become demagnetized
Solution Approach 1:
A thermal conductive sheet is introduced as an intermediary component between the magnetic circuit and the partition wall. This sheet facilitates heat transfer from the voice coil and magnetic circuit to the partition wall, which acts as a heat sink, thereby lowering the temperature of the voice coil and magnet while maintaining installation in the high-temperature engine compartment environment
Solution Approach 2:
The heat dissipation function is extracted and separated from the speaker's acoustic function. The partition wall, which originally serves only as a structural separator between the engine compartment and cabin, is utilized as a heat sink to extract heat from the speaker components, thereby solving the overheating problem without requiring additional active cooling mechanisms
2Reliability
If a relatively large car speaker for reproducing sounds in a low-frequency range is installed in a vehicle cabin, then the sound reproduction quality is improved, but the available space in the vehicle cabin is reduced
Solution Approach 1:
The speaker installation moves from the two-dimensional vehicle cabin interior to the three-dimensional engine compartment space. By utilizing the engine compartment as the installation location and transmitting sound through the partition wall and duct system, the speaker can be larger and positioned outside the cabin while still delivering sound quality and maintaining cabin space
3Temperature
If an elastically deformable thermal conductive sheet is inserted between the partition wall and the magnetic circuit, then heat dissipation is improved, but the device complexity increases
Solution Approach 1:
A thin, elastically deformable thermal conductive sheet is used instead of complex heat dissipation structures. The sheet's flexibility allows it to conform to the surfaces it contacts, ensuring good thermal contact between the magnetic circuit and partition wall while maintaining a simple, lightweight structure that does not significantly increase device complexity
Solution Approach 2:
The thermal conductive sheet automatically adjusts its contact pressure through elastic deformation, ensuring optimal thermal contact without requiring additional fastening mechanisms or adjustment procedures. The sheet self-regulates its position and contact force based on the geometry of the mating surfaces
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 configuration effectively suppresses temperature increases in the voice coil and magnetic circuit, maintaining good speaker performance and reducing the need for expensive dysprosium, thereby lowering the speaker's cost.
Implementation Method 1
an elastically deformable thermal conductive sheet is inserted into the heat dissipation port so as to be sandwiched between the partition wall and the end surface of the magnetic circuit adjacent to the partition wall
Implementation Method 2
the metal partition wall separates the outer space in a high-temperature environment, in which the case of the speaker is installed, from the acoustic space... the metal partition wall can function as a heatsink
Data Source
Figure 1
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AI summary
A speaker includes a magnetic circuit, a voice coil, and a diaphragm, which are disposed in a case. The case is placed in an engine compartment of an automobile. Reproduced sound is emitted to a cabin space through a duct protruding outward from the case. A partition wall, which is a metal body frame of the automobile, is present between the engine compartment and the cabin space. The duct is inserted into a hole formed in the partition wall so that a sound port faces and protrudes into the cabin space. A heat dissipation port is formed in the case, and an end surface the magnetic circuit adjacent to the partition wall is exposed in the heat dissipation port. An elastically deformable thermal conductive sheet is inserted into the heat dissipation port so as to be sandwiched between the partition wall and the end surface of the magnetic circuit.