Parallel Voice Coil Design for Loudspeaker Resistance and Vibration Trade-offs
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Solution Overview
Problem
Traditional loudspeaker designs face a trade-off between internal resistance and vibration characteristics, where reducing voice coil winding turns to minimize resistance compromises vibration performance, and increasing turns to enhance vibration quality increases resistance, failing to meet performance demands.
Innovation Solution
A sound generating unit with a magnetic circuit system and vibration system, featuring a voice coil formed by co-winding two voice coil wires in parallel, with diagonally arranged lead-in and lead-out ends connected to a circuit board, reducing internal resistance while maintaining high BL value and improving vibration sensitivity and sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of winding turns and/or layers of the voice coil wire on the voice coil skeleton is increased to increase the BL value, then the vibration characteristics of the vibration system are improved, but the internal resistance of the voice coil increases, resulting in poor vibration characteristics
Solution Approach 1:
The voice coil is divided into two separate voice coil wires wound in parallel on the voice coil skeleton. Each wire forms an independent conductive path, and the parallel connection reduces the overall internal resistance while maintaining the total number of winding turns needed for high BL value, thus resolving the contradiction between vibration characteristics and internal resistance
Solution Approach 2:
Two voice coil wires are combined in parallel configuration, merging their conductive paths. This combination allows the system to achieve lower internal resistance (since parallel resistors reduce total resistance) while maintaining the required number of turns for high BL value, simultaneously improving both vibration characteristics and reducing harmful resistance effects
2Object-affected harmful factors
If the number of winding turns and/or layers of the voice coil wire on the voice coil skeleton is reduced to reduce the internal resistance, then the internal resistance of the voice coil is reduced, but the BL value decreases, resulting in poor vibration characteristics
Solution Approach 1:
The voice coil is segmented into two parallel wires, allowing each wire to have fewer turns while the parallel combination maintains the effective BL value. This segmentation enables reduction of internal resistance without sacrificing vibration characteristics
Solution Approach 2:
Two voice coil wires are merged in parallel to combine their magnetic field contributions (maintaining BL value) while their parallel electrical connection reduces internal resistance, simultaneously achieving both goals that were previously contradictory
3Reliability
If the voice coil thickness is reduced to narrow the magnetic gap, then the BL value increases and vibration sensitivity improves, but the internal resistance increases if traditional single-wire design is used
Solution Approach 1:
The voice coil is segmented into two thinner parallel wires instead of one thick wire. This allows the voice coil assembly to be thinner (narrowing the magnetic gap and increasing BL value) while the parallel configuration of the two wires reduces internal resistance, resolving the contradiction between vibration sensitivity and internal resistance
Solution Approach 2:
Two thin voice coil wires are combined in parallel, merging their magnetic field effects to maintain high BL value with reduced thickness, while their parallel electrical connection reduces internal resistance, simultaneously achieving narrow magnetic gap and low resistance
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 parallel co-winding design reduces voice coil thickness, narrows the magnetic gap, and enhances vibration sensitivity and sound performance by geometrically symmetric lead wires, reducing distortion and improving sound quality.
Implementation Method 1
the voice coil extends with the other end thereof into the magnetic gap of the magnetic circuit system
Data Source
AI summary
The present disclosure provides a sound generating unit, a sound generating module and electronic terminal, comprising a magnetic circuit system, a vibration system, and a circuit board. The voice coil is jointly wound by two voice coil wires, and the two end portions of each voice coil wire respectively form a wire-in end and a wire-out end; the lead-out positions of the two wire-in ends are located on two sides of the voice coil and arranged diagonally, and the lead-out positions of the two wire-out ends are located on two sides of the voice coil and arranged diagonally; the two wire-in ends and the two wire-out ends are electrically connected to the corresponding pads of the circuit board respectively, and the internal circuit of the circuit board is configured to electrically connect the two wire-in ends together, and electrically connect the two wire-out ends together.