Acoustic Transducer Voice Coil Tilt Control via Feedback
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Solution Overview
Problem
Acoustic transducer systems face inefficiencies due to voice coil misalignment, leading to mechanical damage and audible artifacts, particularly in designs without motor suspension components, which can result in decreased magnetic field strength and overall performance.
Innovation Solution
The implementation of a tilt control system that includes a tilt sensing module and a controller to detect misalignment and generate corrective forces using a tilt control coil, ensuring the voice coil remains aligned within the air gap, thereby maintaining magnetic field strength and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If motor suspension components are omitted to simplify the acoustic transducer system, then device complexity is reduced, but voice coil misalignment occurs leading to mechanical damage and decreased performance
Solution Approach 1:
The patent employs a feedback control mechanism where tilt sensing modules continuously detect the voice coil's alignment status and transmit this information to a controller. The controller processes the tilt data and adjusts the voice coil position in real-time to maintain proper alignment, thereby preventing mechanical damage and performance degradation while eliminating the need for complex motor suspension components
Solution Approach 2:
The patent replaces the traditional mechanical motor suspension system with an electronic control system consisting of tilt sensing modules, a controller, and voice coil actuation. This substitution eliminates mechanical complexity while maintaining alignment stability through electronic feedback control, directly resolving the contradiction between device simplicity and reliability
2Productivity
If voice coil displacement is increased to generate higher output audio signal, then sound output is improved, but misalignment and mechanical damage risk increase
Solution Approach 1:
The feedback control system continuously monitors voice coil displacement and alignment through tilt sensing modules. When the voice coil reaches high displacement positions during loud audio output, the system detects any misalignment tendency and applies corrective forces to maintain proper alignment, enabling high-performance audio output without increasing mechanical damage risk
Solution Approach 2:
The system applies preliminary corrective forces to the voice coil before misalignment can cause mechanical damage. By continuously monitoring tilt and applying counteracting forces through the voice coil actuation system, the patent prevents harmful misalignment effects even during high-displacement audio reproduction
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 solution minimizes voice coil misalignment, preventing mechanical damage and enhancing the acoustic transducer system's efficiency and performance by maintaining optimal alignment and interaction with the magnetic field.
Implementation Method 1
The signal at the voice coil can then cause a magnetic flux to be generated at the voice coil in the driver motor of the acoustic transducer system. The diaphragm can then move in response to the magnetic flux to generate the output audio signal.
Implementation Method 2
transmit the correction signal to the tilt control coil, the correction signal causing the tilt control coil to generate a corrective force for minimizing the misalignment of the voice coil structure
Data Source
AI summary
Acoustic transducer systems involving tilt control, and methods for operating the acoustic transducer systems, are described herein. An example acoustic transducer system includes: a driver motor to generate a magnetic flux; a diaphragm operably coupled to the driver motor; a voice coil structure coupled to the diaphragm and movable in response to the magnetic flux, the voice coil structure includes: a former; a voice coil coupled to the former and movable in response to an input audio signal; and a tilt control coil coupled to the former; a tilt sensing module coupled to the voice coil structure and detects a misalignment of the voice coil structure relative to an initial alignment of the voice coil structure; and a controller for transmitting the input audio signal to the voice coil; and generating and transmitting a correction signal to the tilt control coil for minimizing the misalignment of the voice coil structure.