Rotation Angle Sensor Miniaturization via Segmented Coil Spacing
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Solution Overview
Problem
Existing rotation angle detecting sensors face accuracy degradation due to increased density of connections between adjacent coils when trying to miniaturize the sensor or increase the cycle number, leading to errors in detection results.
Innovation Solution
A rotation angle detecting sensor with an encoder structure having n cycles of phases and inductance elements spaced 90 degrees apart, ensuring a distance of at least half a phase between adjacent elements, reducing interaction and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diameter of the sensor is reduced or the cycle number of the conductor pattern is increased, then the resolution and precision of angle detection are improved, but the connection between adjacent coils becomes dense causing magnetic field changes and detection errors
Solution Approach 1:
The sensor is divided into multiple independent coil units (first coil unit, second coil unit, third coil unit, fourth coil unit) arranged at different angular positions. Each coil unit independently detects magnetic field information, and the results are synthesized to achieve high-precision angle detection while avoiding interference from adjacent coils through proper spatial distribution.
Solution Approach 2:
The patent transitions from a one-dimensional linear arrangement of coils to a two-dimensional circular arrangement around the rotor. By distributing coils in the angular dimension (0°, 90°, 180°, 270° positions), the system achieves better spatial separation and reduces magnetic field interference while maintaining high detection precision.
2Volume of moving object
If the distance between adjacent coils is reduced to miniaturize the sensor, then the sensor size is reduced, but the interaction between adjacent coils increases causing detection errors
Solution Approach 1:
The sensor is divided into multiple independent coil units (first coil unit, second coil unit, third coil unit, fourth coil unit) arranged at different angular positions. Each coil unit independently detects magnetic field information, and the results are synthesized to achieve high-precision angle detection while avoiding interference from adjacent coils through proper spatial distribution.
Solution Approach 2:
Different coil units are positioned at specific angular locations (0°, 90°, 180°, 270°) around the rotor, creating localized detection zones. This spatial distribution ensures that each coil operates in a relatively isolated magnetic field environment, reducing mutual interference while maintaining compact overall sensor dimensions.
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 improves sensor accuracy by maintaining sufficient distance between inductance elements, allowing for miniaturization and increased cycle numbers without degrading detection precision.
Implementation Method 1
an angle sensor for detecting the angle of the rotor is provided... based on a method for detecting the magnetic field of a permanent magnet of the rotor
Implementation Method 2
a rotation angle detecting sensor based on eddy current loss principle... the loss caused in the inductance is intentionally changed due to the eddy current generated in the encoder structure
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4B
AI summary
The present invention is made to provide a rotation angle detecting sensor capable of being miniaturized. The rotation angle detecting sensor includes a rotating body; an encoder structure 3 having n (n represents a positive integer) cycles of phases each ranging from phase 0° to phase 360°, each phase being formed by periodically changing the width of the conductor pattern; and a sensor body having a plurality of inductance elements C1, C2, C3, C4 and disposed opposing the encoder structure 3 with a space. The cycle number n of the phase of the encoder structure 3 is a positive integer equal to or greater than three, the plurality of inductance elements C1, C2, C3, C4 have a phase difference of 90 degrees therebetween, and the two adjacent inductance elements are disposed apart from each other by a space of at least half a phase of the encoder structure 3.