Electromagnetic Rotary Coding Switch With LC Resonant Sensing
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Solution Overview
Problem
Mechanical coding switches produce noise, while Hall-effect and photoelectric switches are costly due to high manufacturing precision and multiple components.
Innovation Solution
An electromagnetic coding switch with an LC resonant circuit on a rotary wheel and a transceiver unit, using electromagnetic signals for signal transmission, eliminating mechanical noise and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If mechanical coding switches are used, then signal transmission is achieved, but mechanical noise is produced
Solution Approach 1:
The patent replaces the mechanical contact-based coding switch with an electromagnetic field-based system. The rotary wheel with conductive patterns and coil assemblies generate and detect electromagnetic signals instead of using mechanical contacts, thereby eliminating mechanical noise while maintaining signal transmission functionality.
2Object-generated harmful factors
If Hall-effect switches are used, then signal transmission is achieved, but manufacturing cost increases due to multiple components
Solution Approach 1:
The patent combines the transmitter and receiver functions into a unified electromagnetic coding switch system. The rotary wheel with conductive patterns serves as both the modulating element and the signal path, while the coil assemblies perform both transmission and reception, reducing component count compared to multiple Hall-effect switches.
Solution Approach 2:
The conductive patterns on the rotary wheel serve multiple functions: they act as electrodes for generating electromagnetic fields, as signal modulators through their rotational position, and as part of the signal transmission path. This multi-functionality reduces the need for separate components.
3Manufacturing precision
If photoelectric coding switches are used, then signal transmission is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces the optical system with an electromagnetic system. Instead of using light sources, optical sensors, and precise optical alignments, the system uses electromagnetic fields generated by coils and conductive patterns, which are less sensitive to alignment precision and manufacturing tolerances.
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
The solution provides a noise-free, cost-effective, and flexible signal transmission mechanism with wide application scope, utilizing electromagnetic signals for rotary wheel rotation information calculation.
Implementation Method 1
the inductor L has a magnetic core and is configured to receive and transmit an electromagnetic wave
Implementation Method 2
performing energy exchange by an inductor L and a capacitor C in the LC resonant circuit within a reception cycle of the antenna, and generating a free oscillation signal at a natural resonant frequency
Data Source
AI summary
An electromagnetic encoding switch and a method for calculating rotation information of a runner. The electromagnetic encoding switch (10) comprises: a runner assembly (11), wherein the runner assembly (11) comprises an LC resonant circuit (111), the LC resonant circuit (111) comprising an inductor L and a capacitor C connected to the inductor L, the inductor L having a magnetic core, and the inductor L being used for receiving and transmitting electromagnetic waves; a runner (112), the LC resonant circuit (111) being disposed on the runner (112); a transceiver unit (12), the transceiver unit (12) comprising an antenna (121) disposed below the runner (112) and used for transmitting electromagnetic waves at a preset frequency in a transmitting period, so that the LC resonant circuit (111) receives energy in the transmitting period; and an antenna selection switch (122) connected to the antenna (121). The electromagnetic encoding switch (10) has no mechanical noise and is low-cost.