Vortex Cooling Voice Coil Spiral Air Passages
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Solution Overview
Problem
High power low frequency transducers, such as loudspeakers, face efficiency and reliability issues due to high voice coil temperatures, as existing cooling methods do not provide sufficient air flow in terms of volume and velocity to effectively cool the voice coil.
Innovation Solution
The transducer design incorporates non-radial air passages in the pole piece that circulate cooling air around the voice coil, directing it spirally through the speaker, enhancing air flow and magnetic conductance, thereby improving cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air circulation is used to cool the voice coil, then the voice coil temperature is reduced, but the air flow volume and velocity are insufficient to be effective
Solution Approach 1:
The patent employs spiral-shaped air passages instead of straight radial passages. The spiral configuration increases the path length and promotes rotational air flow, thereby increasing both the volume and velocity of air reaching the voice coil while maintaining effective cooling.
Solution Approach 2:
The invention transitions from simple radial air passages to three-dimensional spiral passages that utilize both radial and tangential components. This dimensional change allows the air to gain rotational momentum and increases the effective cooling surface area around the voice coil.
2Temperature
If air circulation is used to cool the voice coil, then the voice coil temperature is reduced, but the air flow velocity is insufficient to be effective
Solution Approach 1:
The spiral configuration of air passages creates a curved flow path that imparts rotational velocity to the air. As air travels through the spiral passages, it gains tangential speed, resulting in higher velocity air impinging on the voice coil for more effective convective cooling.
Solution Approach 2:
The invention utilizes fluid dynamics principles by designing spiral passages that convert pressure differential into rotational kinetic energy. The air flow behaves like a vortex, increasing velocity through the spiral path and delivering high-speed cooling air to the voice coil.
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 achieves superior air flow and magnetic conductance, resulting in faster and greater air volume for cooling the voice coil, which helps maintain efficiency and reliability by effectively managing temperature.
Implementation Method 1
Two separate air intakes route cooling air through spiral (e.g., non-radial) passages that circulate the air around the voice coil
Data Source
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AI summary
A low frequency transducer arrangement includes at least one substantially annular magnet. A voice coil is disposed within and concentric with the magnet. A pole is disposed within and concentric with the voice coil. An air gap is defined between the magnet and the pole. The pole includes a bottom half having a downwardly facing axial recess. A plurality of first air passages extend laterally from the axial recess and fluidly interconnect the recess and the air gap. A top half has an upwardly facing axial recess. A plurality of second air passages extend laterally from the upwardly facing axial recess and fluidly interconnect the upwardly facing recess and the air gap. The first air passages and/or the second air passages are non-radially oriented.