Inductive Position Measuring Device Eccentricity Error Correction
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Solution Overview
Problem
Inductive position-measuring devices face challenges in accurately determining relative angular and linear positions due to errors caused by eccentricity and imprecise placement of the graduation element, leading to reduced system accuracy.
Innovation Solution
The device incorporates a scanning element with two receiver tracks, one for detecting angular position and another for detecting linear position, allowing for the modulation of an electromagnetic field to correct angular position measurements, thereby enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single receiver track is used for angular position measurement, then the device complexity is reduced, but measurement precision deteriorates due to eccentricity and placement errors
Solution Approach 1:
The receiver track is segmented into multiple independent receiver lines (first receiver line, second receiver line, third receiver line) with different orientations. Each receiver line independently measures angular position, and their results are combined to eliminate errors caused by eccentricity and placement deviations, thereby improving measurement precision without requiring a completely complex device structure.
Solution Approach 2:
The multiple receiver lines serve multiple functions: they simultaneously detect angular position, compensate for eccentricity errors, and correct placement deviations. This multi-functionality allows a single receiver track configuration to achieve both high measurement precision and error compensation, resolving the contradiction between measurement accuracy and device complexity.
2Adaptability or versatility
If only angular position is measured, then the device complexity is reduced, but adaptability deteriorates as linear position cannot be detected
Solution Approach 1:
The same receiver track structure with multiple receiver lines serves dual purposes: it simultaneously measures both angular position and linear position. The first receiver line detects angular position while the second and third receiver lines detect linear position in different directions. This multi-functional design enables the device to detect multiple types of position information without requiring separate measurement systems, thereby improving adaptability while controlling device complexity.
Solution Approach 2:
The measurement capability is extended from one dimension (angular position only) to multiple dimensions by adding receiver lines oriented in different directions. The receiver lines are arranged to detect both rotational movement (angular dimension) and translational movement (linear dimension), enabling the device to measure position in multiple spatial dimensions simultaneously, thus improving versatility.
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 effectively increases system accuracy for measuring angular positions by correcting errors and allowing independent detection of relative positions, improving precision compared to conventional angle encoders.
Implementation Method 1
an electromagnetic field, which is generated with the aid of the graduation track by the at least one exciter lead
Data Source
AI summary
An inductive position-measuring device includes a scanning element and a graduation element, rotatable about an axis relative to the scanning element. The scanning element has exciter lead(s), a first receiver track, including receiver line(s), extending according to a first periodic pattern having a first period along a first direction, and a second receiver track, including receiver line(s). The graduation element includes a graduation track, extending in the circumferential direction and including a graduation period. An electromagnetic field generated by the exciter lead(s) with the aid of the graduation track is able to be modulated, so that an angular position is detectable with the aid of the receiver line of the first receiver track, and a position of the graduation element in the first direction relative to the scanning element is detectable with the aid of the receiver line of the second receiver track.