Servo Vibration Detector Coil Inversion
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Solution Overview
Problem
Conventional servo-type acceleration sensors face challenges in production technology due to complex wiring processes and high production costs, particularly in forming conductive paths between moving components, which affects yield and reliability.
Innovation Solution
The proposed solution involves fixing the coil in a closed loop magnetic circuit, allowing only the permanent magnet and yoke material to move, thereby eliminating the need for complex wiring and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the coil is made movable in conventional servo-type acceleration sensors, then the sensor can detect acceleration accurately, but the wiring process becomes complex and production cost increases
Solution Approach 1:
The patent inverts the conventional design by making the permanent magnet movable instead of the coil. In conventional sensors, the coil moves with the mass, requiring complex wiring. This patent fixes the coil and makes the permanent magnet move with the mass, eliminating the wiring complexity while maintaining acceleration detection accuracy through electromagnetic interaction between the fixed coil and moving permanent magnet.
2Ease of operation
If complex wiring processes are used to form conductive paths between moving components, then the sensor can function properly, but yield and reliability decrease
Solution Approach 1:
The patent eliminates the need for complex wiring by inverting which component moves. The fixed coil with fixed conductive paths interacts electromagnetically with the moving permanent magnet. This inversion removes the reliability issues associated with wiring moving components while maintaining full sensor functionality.
3Ease of manufacture
If the coil is fixed and only permanent magnet and yoke material move, then production cost decreases, but the force constant may be affected
Solution Approach 1:
The patent performs preliminary action by pre-positioning the permanent magnet within the closed loop magnetic circuit formed by the fixed coil and yoke materials. This preliminary arrangement ensures optimal magnetic flux distribution and electromagnetic force generation before the sensing operation begins, maintaining the force constant while simplifying the moving components to only the permanent magnet and yoke material.
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 approach simplifies the production process, reduces costs, and improves the reliability and yield of servo-type acceleration sensors, while also enhancing their performance by increasing the force constant and reducing mechanical noise.
Implementation Method 1
a displacement detecting unit detecting displacement of the movable member in the predetermined direction
Implementation Method 2
a drive means configured to generate an electromagnetic force for returning the movable member to an origin position
Data Source
AI summary
A movable member coupled to a displacement detector via a void is disposed with respect to a fixed member to which a coil is fixed. By disposing the coil in a closed loop magnetic circuit including a permanent magnet, the movable-side member, and the fixed member, a Lorentz force for moving the movable-side member in the axial direction is generated.