Electrodynamic Vibrator with Coiled Wave Spring
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Solution Overview
Problem
Conventional vibrators face challenges in achieving great vibration while maintaining a compact size and stable operation, often resulting in larger devices due to the need for balance between drive force and support force, and the weakness of cantilever-shaped damper arms can lead to structural issues.
Innovation Solution
The use of a compact electrodynamic vibrator design featuring a frame with a voice coil, a shaft member, a magnetic circuit with a magnetic gap, and coiled wave springs that are compressed and biased to provide restorative force, allowing the magnetic circuit to vibrate stably and efficiently, even under great forces, while maintaining a smaller size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relatively-larger outer dimension is used to achieve balance between drive force and support force, then vibration stability is improved, but the overall size of the vibrator increases
Solution Approach 1:
The patent transitions from a conventional planar arrangement to a three-dimensional concentric configuration where the voice coil is positioned at the center of the magnetic circuit. This spatial reorganization allows for more efficient use of space, enabling the vibrator to achieve the required drive force and support force balance within a compact volume, thus resolving the contradiction between vibration stability and overall size.
Solution Approach 2:
The patent integrates multiple functional components (voice coil, magnetic circuit, damper) into a tightly coupled concentric structure. By merging these elements into a unified assembly where the voice coil is centrally positioned within the magnetic circuit, the design achieves both drive force generation and support force balance in a compact configuration, eliminating the need for a larger outer dimension.
2Ease of manufacture
If the damper is made cantilever-shaped to reduce moment, then ease of manufacture is improved, but strength in the direction perpendicular to vibration direction decreases
Solution Approach 1:
The patent employs an asymmetric damper design where the arm has different structural characteristics in different directions. The damper arm is configured with enhanced thickness or reinforcement specifically in the direction perpendicular to the vibration direction, while maintaining the cantilever shape for ease of manufacture. This asymmetric strengthening allows the damper to withstand higher loads in the critical direction without compromising manufacturing simplicity.
3Volume of moving object
If the magnetic circuit is made smaller to reduce vibrator size, then volume is reduced, but vibration output decreases
Solution Approach 1:
The patent optimizes the parameters of the magnetic circuit and voice coil interaction to achieve higher efficiency. By adjusting parameters such as magnetic flux density, coil turns, and gap dimensions, the design maximizes the force generated per unit volume of the magnetic circuit. This allows the vibrator to maintain high vibration output despite the reduced size of the magnetic circuit.
Solution Approach 2:
The patent utilizes periodic electromagnetic forcing through the voice coil to generate vibration. By optimizing the frequency and amplitude of the electrical signal applied to the voice coil, the system achieves resonant or near-resonant operation, which amplifies the vibration output relative to the size of the magnetic circuit, thereby maintaining high power output in a compact configuration.
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 enables the generation of great vibration with stable operation, reducing the overall size of the vibrator compared to the magnetic circuit, and enhances durability by preventing plastic deformation of the coiled wave springs under high compression.
Implementation Method 1
a voice coil in which current flows is, at one end thereof, fixed to the frame, and is arranged in a magnetic gap to generate drive force of vibration of the magnetic circuit
Implementation Method 2
a compression coil spring arranged between one end side of the magnetic circuit and one end side of the frame along the axial direction in the internal space
Data Source
AI summary
The vibrator includes a frame defining an internal space, a voice coil fixed to the frame in the internal space, a shaft member arranged along an axial direction of the coil in the internal space, a magnetic circuit arranged slidably relative to the shaft member and having a magnetic gap in which the coil is arranged, and a compression coil spring arranged between one end side of the magnetic circuit and one end side of the frame along the axial direction in the internal space. The compression coil spring is a coiled wave spring configured such that a plate-shaped steel wire is multiple-wound in a spiral shape in a circumferential direction of the shaft member to alternately form a peak portion and a trough portion at an equal interval and the peak portion and the trough portion contact each other in the axial direction.