Segment Position Sensor Coil Layout for Uniform Signal Linearity
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Solution Overview
Problem
Position sensors with segment sensor elements face challenges in achieving uniform signal amplitudes and linearity due to the lack of symmetry, leading to misinterpretation of non-uniformities by processing circuitry and difficulties in maintenance.
Innovation Solution
The segment sensor element includes receive coils with distorted shapes along the radial and circumferential directions, and a breakthrough balancing structure to reduce errors and improve signal uniformity and linearity, with processing circuitry configured to correct signal parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If segment sensor elements are used, then the position sensor can be maintained more easily, but the signal amplitudes become non-uniform and linearity deteriorates
Solution Approach 1:
The patent applies local quality by making each receive coil have a different shape corresponding to a periodic waveform with specific radial width characteristics. This local differentiation in coil geometry compensates for the inherent asymmetry of segment sensor elements, ensuring that each position region produces uniform signal amplitudes and maintains linearity, thereby resolving the contradiction between ease of maintenance and measurement precision.
2Volume of moving object
If receive coils are positioned within the transmit coil space, then the sensor element size is reduced, but signal uniformity and linearity are compromised
Solution Approach 1:
The patent employs parameter changes by varying the shapes of receive coils according to periodic waveforms with specific radial widths. This parametric differentiation allows multiple receive coils to be compactly positioned within the transmit coil space while each coil's tailored geometry ensures uniform signal amplitudes and maintains measurement linearity, resolving the contradiction between compact size and measurement precision.
3Measurement precision
If the shape of receive coils corresponds to periodic waveforms with varying radial width, then signal uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses parameter changes by defining receive coil shapes through periodic waveforms with controlled radial width variations. This systematic parametric approach, while improving signal uniformity, can be implemented through standardized manufacturing processes for coil winding and shaping, balancing manufacturing complexity with performance improvement.
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
The solution results in more uniform signal amplitudes and improved linearity, reducing errors in position detection and facilitating easier maintenance by addressing the symmetry-related issues in segment sensor elements.
Implementation Method 1
The plurality of receive coils are inductively coupled to the transmit coil each time the target passes over the sensor element. When the plurality of receive coils are inductively coupled to the transmit coil, each of the plurality of receive coils can output a signal
Data Source
AI summary
A position sensor is provided. The position sensor includes a target and a segment sensor element. The segment sensor element defines a circumferential direction and a radial direction. The segment sensor element includes a transmit coil. The segment sensor element includes a plurality of receive coils positioned within a space defined by the transmit coil. The plurality of receive coils are offset relative to one another. The shape of each of the plurality of receive coils corresponds to a periodic waveform having a radial width that varies along the circumferential direction. Furthermore, the shape of at least one receive coil of the plurality of receive coils is distorted along at least one of the radial direction or the circumferential direction.