Position Detection Device Eliminating Voltage-Dividing Resistances
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional position detection devices without a secondary coil face limitations in dynamic range due to the use of voltage-dividing resistances, which affect reliability and noise cancellation, and are cumbersome due to the need for additional components.
Innovation Solution
A position detection device comprising pairs of coils with impedance variations of opposite phases, connected in series to produce a voltage-divided output signal, eliminating the need for fixed resistances and allowing for twisted pair wiring to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage-dividing resistances are used to produce detection output voltage, then the device can generate output signal, but the dynamic range is limited and reliability is affected due to environmental interference
Solution Approach 1:
The patent extracts and eliminates the voltage-dividing resistance component from the detection system. Instead of using external resistances to generate detection output voltage, the invention uses the impedance characteristics of the coil itself to produce the detection signal, thereby removing the component susceptible to environmental interference
Solution Approach 2:
The coil's own impedance variation serves as the detection mechanism. The detection output voltage is generated based on the coil's self-impedance characteristics rather than requiring separate resistance components, making the system self-sufficient and immune to external environmental effects on passive components
2Measurement precision
If voltage-dividing resistances are used to take out detection output voltage, then output signal can be obtained, but the dynamic range of detection output voltage is limited
Solution Approach 1:
The patent changes the detection parameter from voltage division through resistance to impedance-based voltage generation. By utilizing the coil's impedance variation with position, the system achieves a wider dynamic range in detection output voltage without requiring additional passive components
3Object-affected harmful factors
If separate resistance components are used for voltage division, then detection output can be obtained, but noise cancellation is compromised due to inability to form twisted pair wiring
Solution Approach 1:
The patent merges the detection output generation function directly into the coil structure itself. By taking the detection output voltage from the coil's own impedance characteristics rather than through separate resistance components, the system enables twisted pair wiring configuration for effective noise cancellation
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 enhances the dynamic range of detection output voltage, improves reliability by avoiding environmental interference, and enables effective noise cancellation.
Implementation Method 1
a magnetism-responsive member movable relative to the coil section, a relative position of the magnetism-responsive member with respect to the coil section varying in accordance with a position of a detection object, the magnetism-responsive member being constructed to vary impedance of each coil according to the relative position
Data Source
AI summary
In a position detection device of a type that omits a secondary coil, various inconveniences arising from the use of a voltage-dividing resistance (fixed resistor) are eliminated. At least two pairs of coils are provided. A magnetism-responsive member are placed so as to effect relative displacement in relation to the coils, the relative position of the member in relation to the coils varies with a position of a detection object, and impedance of each coil is varied with the relative position. The impedance changes of two coils constituting each one of coil pairs present characteristics of mutually opposite phase characteristics. For each coil pair, the two coils constituting the pair are connected in series with each other, and from a connection point thereof, a voltage-divided output voltage according to the impedance of the two coils is taken out as a detection output signal for the pair.