Induction Rotary Encoder Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Induction detecting type rotary encoders face crosstalk issues due to differences in current path lengths on the inner and outer circumferences of magnetic flux coupling bodies, leading to incomplete cancellation of inductive currents and affecting location detection accuracy.
Innovation Solution
The design includes a stator with specific coil configurations and magnetic flux coupling bodies where the closest distances between coils are adjusted to reduce the difference in inductive currents, with the first inner circumference coil closer to the second magnetic flux coupling body and the first outer circumference coil farther, and vice versa, to enhance magnetic flux coupling and minimize crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the magnetic flux coupling body has a continuous toothed pattern with different lengths for inner and outer segments, then the structure is simple and compact, but the inductive currents cannot be completely cancelled causing crosstalk
Solution Approach 1:
The patent applies asymmetry by intentionally designing the inner and outer segments of the magnetic flux coupling body with different lengths. This asymmetric structure creates different current path lengths that prevent complete cancellation of inductive currents, thereby reducing crosstalk between adjacent coils while maintaining structural simplicity
Solution Approach 2:
The patent applies local quality by making the inner and outer segments have different lengths specifically at the regions where inductive currents flow. This localized differentiation in segment lengths targets the specific problem of incomplete current cancellation without requiring complex modifications throughout the entire structure
2Reliability
If the inner and outer current paths have equal lengths, then the inductive currents can be completely cancelled, but the structure becomes more complex and compactness is reduced
Solution Approach 1:
Instead of making the inner and outer segments equal in length (which would require complex structural adjustments), the patent uses asymmetry by allowing them to have different lengths. This approach achieves crosstalk reduction through a simpler, more straightforward structural design that maintains compactness
3Device complexity
If the transmitting coils are stacked with insulating layers to create compact structure, then the device becomes compact, but the magnetic flux coupling between coils is reduced
Solution Approach 1:
The patent applies local quality by providing insulating layers only at specific locations between the transmitting coils and between the magnetic flux coupling bodies, rather than uniformly throughout the entire structure. This localized insulation approach maintains compact stacking while preserving necessary magnetic flux coupling paths
Solution Approach 2:
The patent segments the magnetic flux coupling body into inner and outer segments with different lengths, allowing selective magnetic flux coupling. This segmentation enables the structure to maintain compactness while creating controlled magnetic coupling paths that reduce crosstalk
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 reduces crosstalk, enabling more accurate location detection by ensuring complete cancellation of inductive currents and improving the signal intensity received by the receiving coils.
Implementation Method 1
Due to this transmission current flowing through the transmitting coil, the magnetic field is generated
Implementation Method 2
the magnetic flux coupling body generates inductive current on the basis of this magnetic field
Implementation Method 3
the receiving coil detects an inductive voltage on the basis of the magnetic field generated from the inductive current flowing through the magnetic flux coupling body
Data Source
AI summary
An induction detecting type rotary encoder includes: a stator; a rotor disposed opposite the stator; a first transmitting coil that is provided in the stator and includes a first inner circumference coil and a first outer circumference coil; a second transmitting coil that is provided in the stator and includes a second inner circumference coil and a second outer circumference coil; first and second receiving coils provided in the stator; and first and second magnetic flux coupling bodies provided in the rotor. The closest distance between the first inner circumference coil and the second magnetic flux coupling body is shorter than that between the first outer circumference coil and the second magnetic flux coupling body. The closest distance between the second inner circumference coil and the first magnetic flux coupling body is shorter than that between the second outer circumference coil and the first magnetic flux coupling body.