Rotary Encoder Crosstalk Suppression via Segmented Magnetic Flux Coupling
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Solution Overview
Problem
Existing rotary encoders face challenges in minimizing crosstalk between adjacent tracks, which affects precision, especially when integrated into compact devices like micrometers.
Innovation Solution
The design incorporates a stator and rotor configuration with concentrically arranged transmitting and receiving coils, along with magnetic flux coupling bodies, where the distance and positioning of these components are optimized to minimize crosstalk, with specific patterns on the magnetic flux coupling bodies to ensure continuous peripheral alignment and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple tracks (transmitting coil, receiving coil, and magnetic flux coupling coil) are integrated concentrically to decrease encoder size, then the encoder can be applied to compact devices like micrometers, but crosstalk between adjacent tracks increases and measurement precision deteriorates
Solution Approach 1:
The magnetic flux coupling body is divided into multiple independent coupling portions, each corresponding to a specific track. This segmentation isolates the magnetic coupling paths between adjacent tracks, preventing crosstalk while maintaining the compact concentric structure. Each coupling portion independently couples with its corresponding receiving coil without interfering with neighboring tracks.
Solution Approach 2:
Different regions of the magnetic flux coupling body are designed with distinct properties - each coupling portion has optimized magnetic permeability and geometry tailored to its specific track's requirements. This local optimization ensures strong coupling for the intended track while minimizing electromagnetic interference with adjacent tracks, resolving the precision issue in compact configurations.
2Measurement precision
If crosstalk between adjacent tracks is not suppressed, then device complexity remains low, but measurement precision deteriorates due to interference between tracks
Solution Approach 1:
Multiple magnetic flux coupling portions are integrated into a single magnetic flux coupling body, combining the functions of multiple components into one unified structure. This merging approach suppresses crosstalk through the integrated design while avoiding the complexity of separate coupling components for each track, achieving precision enhancement without proportional complexity increase.
Solution Approach 2:
The magnetic flux coupling body is positioned within the stator assembly, with coupling portions nested concentrically around the rotor. This nesting arrangement allows multiple coupling portions to coexist in a compact space without requiring separate housings or complex mounting structures, suppressing crosstalk while maintaining simplicity.
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 significantly reduces measurement errors by suppressing crosstalk between tracks, enabling highly precise angle measurements in rotary encoders, particularly in compact applications such as digital micrometers.
Implementation Method 1
measures a rotary angle of an object by using magnetic flux coupling between wirings provided in a rotor and a stator
Implementation Method 2
a magnetic flux coupling coil for causing magnetic flux coupling with the transmitting and receiving coils
Data Source
AI summary
An induction detecting type rotary encoder includes: a stator; a rotor configured to be rotated with respect to a rotary shaft; a first transmitting coil; a second transmitting coil; a first receiving coil; a second receiving coil; a first magnetic flux coupling body; and a second magnetic flux coupling body. The first transmitting coil is disposed between the first and second receiving coils. A distance between the second transmitting coil and the rotary shaft is larger than that of the second receiving coil and the rotary shaft. The first magnetic flux coupling body forms a first track for causing a periodic change for each rotation. The second magnetic flux coupling body forms a second track for causing a periodic change for each rotation. The second magnetic flux coupling body has a pattern of which an inner peripheral side is substantially continuous in a circumferential direction.