Electromagnetic Encoder Continuous Receiver Coil Wiring Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electromagnetic induction type encoders face challenges in downsizing due to the increasing number of extraction wirings required for longer absolute position (ABS) lengths, which limits the miniaturization of sensor substrates and signal processing ICs.
Innovation Solution
The design incorporates a detection head and scale with transceiver coils and periodically arrayed conductor elements, where the receiver coil continuously extends between tracks, electromagnetically coupled to detect magnetic flux phases, reducing the number of extraction wirings by alternating transmission signals between tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the number of tracks is increased to lengthen ABS length, then the absolute position measurement range is extended, but the number of extraction wirings increases in proportion to the number of tracks, making it difficult to downsize the sensor substrate and IC
Solution Approach 1:
The patent merges the functions of multiple receiver coils by using a single continuous receiver coil that extends across multiple tracks. This single coil is electromagnetically coupled with multiple sets of periodical elements from different tracks, allowing one coil to detect signals from multiple tracks simultaneously, thereby reducing the number of extraction wirings needed
Solution Approach 2:
The single receiver coil performs multiple functions by detecting magnetic flux from multiple tracks through electromagnetic coupling with different sets of periodical elements. This multi-functional approach allows one coil to replace what would traditionally require multiple separate coils and their associated extraction wirings
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 allows for a compact encoder with extended ABS length by minimizing the number of receiver coil wirings, facilitating smaller sensor substrates and ICs while maintaining measurement accuracy.
Implementation Method 1
electromagnetic induction type encoders using electromagnetic connection between a detection head and a scale
Implementation Method 2
a receiver coil that continuously extends from the first track to the second track, is electromagnetically coupled with the magnetic flux generated by the first plurality of periodical elements and the magnetic flux generated by the second plurality of periodical elements, and detects a phase of the magnetic flux
Data Source
AI summary
An electromagnetic induction type encoder includes a detection head and a scale. The detection head has a first transceiver coil to generate magnetic flux with respect to a first track and a second transceiver coil to generate magnetic flux with respect to a second track. The scale has a first plurality of periodical elements with respect to the first track and a second plurality of periodical elements with respect to the second track. The detection head has a receiver coil that continuously extends from the first track to the second track, is electromagnetically coupled with the magnetic flux generated by the first plurality of periodical elements and the magnetic flux generated by the second plurality of periodical elements, and detects a phase of the magnetic flux generated by the first plurality of periodical elements and a phase of the magnetic flux generated by the second plurality of periodical elements.