Electric Field Time-Grating Angular Displacement Sensor
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Solution Overview
Problem
Existing time-grating angular displacement sensors based on alternating electric fields face measurement errors due to interference between signals from electrodes with different length-width ratios and inconsistencies in electric field coupling strengths, leading to precision issues and manufacturing challenges.
Innovation Solution
An electric field time-grating angular displacement sensor utilizing a single circle multilayer structure with sinusoidal rotor electrodes and multilayer stator electrodes, eliminating the need for an adding circuit and simplifying the system structure, directly generating traveling wave signals through electric field coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two circles of electrodes with different length-width ratios are used to generate standing wave signals, then the sensor can measure angular displacement, but the signals from the two circles interfere with each other, increasing measurement errors
Solution Approach 1:
The patent extracts and eliminates one of the two circles of electrodes, transitioning from a dual-circle structure to a single-circle multilayer structure. This removes the source of signal interference while preserving the essential measurement function through the remaining single circle of electrodes combined with multilayer construction.
Solution Approach 2:
The patent introduces a multilayer dimension to the electrode structure. Instead of using two separate circles in the same plane, it employs multiple layers within a single circle, adding the vertical dimension (layer stacking) to achieve the necessary signal generation without inter-circle interference.
2Reliability
If two circles of electrodes are used in the sensor structure, then standing wave signals can be generated, but manufacturing consistency between the two circles is difficult to ensure
Solution Approach 1:
The patent removes one circle of electrodes from the structure, reducing the number of components that need to be manufactured with consistent specifications. This simplifies the manufacturing process and eliminates the difficulty of ensuring consistency between two separate circles.
Solution Approach 2:
The patent merges the function of two separate electrode circles into a single circle with multilayer structure. This consolidation reduces the number of manufacturing steps and quality control checkpoints, making it easier to ensure manufacturing consistency.
3Adaptability or versatility
If two circles of electrodes are used with different length-width ratios, then the varying patterns of standing wave signals differ, but this leads to amplitude inconsistency and measurement errors
Solution Approach 1:
The patent applies different properties to different layers within the single circle structure. Each layer can have optimized characteristics for its specific function, while the overall single-circle geometry ensures consistent amplitude. This local differentiation within a unified structure resolves the contradiction between signal pattern variety and amplitude consistency.
4Ease of operation
If an adding circuit is used to combine two channels of standing wave signals, then a traveling wave signal can be generated, but the system structure becomes complex and installation accuracy requirements increase
Solution Approach 1:
The patent removes the adding circuit from the system by designing the electrode structure to directly generate traveling wave signals. This eliminates the need for additional signal processing components and simplifies the overall system architecture.
Solution Approach 2:
The electrode structure itself performs the function previously requiring an external adding circuit. The single circle multilayer electrode configuration directly generates the traveling wave signal through its geometric and electrical properties, making the system self-sufficient and reducing external component requirements.
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 reduces measurement errors, lowers installation accuracy requirements, and enhances precision, resulting in a more stable and accurate angular displacement measurement system with improved industrial applicability.
Implementation Method 1
the rotor electrodes and the stator electrodes are directly facing each other with a space δ there between, so as to form a coupled capacitor
Implementation Method 2
form a coupled capacitor
Data Source
AI summary
An electric field type time-grating angular displacement sensor, including a rotor and a stator. The rotor includes m rotor electrodes. The rotor electrodes cover a circle on a surface of a rotor body with equal space. The stator includes 4m stator electrodes. The stator electrodes cover a circle on a surface of a stator body with equal space.