Rotating Body Sensing Coils for Precise Direction and Angle Detection
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Solution Overview
Problem
Existing rotating body sensing technologies face challenges in accurately determining the rotation direction, angle, and angular velocity, especially in compact and thin devices, due to limitations in sensing precision and resolution.
Innovation Solution
The apparatus employs multiple sensing coils and oscillation circuits connected to capacitors, with a rotation information calculator that generates count values from oscillation signal frequencies to calculate rotation direction, angle, and angular velocity, utilizing comparison values to refine the output signal and determine the rotation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensing coils and oscillation circuits are used to improve sensing precision, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing system is divided into multiple independent oscillation circuits, each with its own sensing coil and capacitor. Each circuit independently senses the position of detected objects at different locations, enabling precise measurement of rotation angle and direction while maintaining modular architecture that manages complexity.
Solution Approach 2:
The oscillation circuits serve multiple functions: they generate oscillation signals for sensing, detect position of detected objects through frequency changes, and provide information for calculating rotation direction and angle. This multi-functionality reduces the need for separate components, managing device complexity while improving measurement precision.
2Measurement precision
If multiple sensing coils and oscillation circuits are used to improve sensing precision, then measurement precision is improved, but the number of components increases
Solution Approach 1:
Multiple oscillation circuits are integrated within a single sensing apparatus, sharing common structural support and electrical connections. The circuits are combined in a compact arrangement where each circuit includes a sensing coil and capacitor that work together, reducing the overall space and component count compared to separate independent sensing systems.
3Measurement precision
If frequency counting and comparison methods are used to calculate rotation information, then measurement precision is improved, but calculation complexity increases
Solution Approach 1:
The system counts oscillation signal frequencies from multiple circuits and compares them to determine rotation direction and calculate rotation angle. The frequency comparison provides feedback information that enables precise calculation of rotation parameters. The rotation information calculator uses the frequency differences to generate accurate rotation information, managing calculation complexity through systematic comparison methods.
Solution Approach 2:
The oscillation circuits continuously generate oscillation signals and the system continuously counts frequencies before rotation events occur. This preliminary action ensures that frequency data is always available and updated, enabling immediate and accurate calculation of rotation direction and angle when rotation occurs, without requiring complex real-time processing during the rotation event itself.
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 provides precise sensing of rotation direction, angle, and angular velocity, enhancing the accuracy and resolution of rotation information in compact devices, enabling effective monitoring of rotating bodies.
Implementation Method 1
at least two sensing coils facing the units to be detected... an oscillator including at least two capacitors respectively connected to the at least two sensing coils to form at least two oscillation circuits
Data Source
AI summary
An apparatus for sensing a rotating body includes a plurality of units to be detected provided on the rotating body; at least two sensing coils disposed to face the units to be detected; an oscillator including at least two capacitors respectively connected to the at least two sensing coils to form at least two oscillation circuits; and a rotation information calculator configured to count frequencies of at least two oscillation signals respectively output from the at least two oscillation circuits to generate a first count value and a second count value, and calculate a rotation direction of the rotating body based on a change in the first count value and a change in the second count value.