Rotor Angular Position Detection Using Layered Width Encoding
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Solution Overview
Problem
Existing rotor apparatuses face challenges in accurately detecting angular positions due to variations in inductance that are not effectively correlated with angular positions, leading to reduced precision and accuracy in angular position identification.
Innovation Solution
The implementation of an angular position identification layer and an angular range identification layer, both rotating around the rotor axis, with varying widths corresponding to different angular positions, and utilizing inductors to generate inductance values that are processed to correct and enhance the accuracy of angular position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional rotor apparatuses use conventional inductance detection methods, then the device complexity is low, but the measurement precision of angular position is reduced
Solution Approach 1:
The rotor structure is segmented into multiple functional layers: a base rotor layer and superimposed angular position identification layers. Each layer has a specific function - the base rotor provides rotational movement while the identification layers with varying widths encode angular position information. This segmentation allows the system to achieve high measurement precision through the layered structure without requiring a completely new detection mechanism, thus improving angular position detection precision while maintaining reasonable device complexity.
Solution Approach 2:
The patent introduces angular position information in a new dimension by varying the width of identification layers in the radial direction rather than using traditional angular or axial variations. The width of each identification layer corresponds to a specific angular position range, creating a radial dimension encoding scheme. This dimensional change enables the inductance detector to measure angular position through radial inductance variations, significantly improving measurement precision while using simple detection hardware.
2Measurement precision
If the angular position identification layer has varying widths to improve detection accuracy, then the manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes parameter changes in the identification layers - specifically varying the width parameter of each layer to encode angular position information. By designing layers with systematically varied widths corresponding to different angular ranges, the system achieves high identification accuracy. The width parameter serves as the encoding variable, and this parameter change approach allows for flexible design while maintaining manufacturability through standard fabrication techniques.
Solution Approach 2:
The angular position identification layers can be manufactured as replicated patterns around the rotor circumference. Each layer represents a copied structure with specific width characteristics that repeat angularly, allowing for consistent performance through replication rather than requiring unique precision-critical features at each position. This copying approach reduces manufacturing precision requirements compared to creating entirely unique features for each angular position.
3Measurement precision
If multiple angular position identification layers are used to enhance detection sensitivity, then the device complexity increases
Solution Approach 1:
The patent combines multiple identification layers with different width patterns into a single integrated rotor structure. The layers are superimposed radially, with each layer providing complementary angular position information through its unique width variation pattern. This merging of multiple layers into one cohesive structure enhances detection sensitivity by providing redundant and complementary measurement signals, while the integrated design prevents excessive device complexity by maintaining a unified rotor architecture rather than separate components.
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 solution improves the precision and accuracy of angular position detection by correlating inductance changes with angular positions, increasing the sensitivity and linearity of the detection process, thereby enhancing the efficiency and reliability of rotor position identification.
Implementation Method 1
an angular position identification inductor; an angular range identification inductor
Data Source
AI summary
A rotor apparatus includes: a rotor configured to rotate around a rotational axis; an angular position identification layer disposed to surround the rotational axis and configured to rotate according to rotation of the rotor, and having a width varying with angular positions of the rotor; and an angular range identification layer disposed to surround the rotational axis and configured to rotate according to the rotation of the rotor, and configured such that a plurality of portions of the angular range identification layer respectively corresponding to a plurality of different angular position ranges of the rotor have different overall widths.