Wiegand Sensor Cross-Axial Arrangement for Rotary Angle Detection
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Solution Overview
Problem
Magnet-based rotary angle sensor systems require costly and difficult-to-manufacture Wiegand sensor modules with winding-free coil portions, necessitating a large installation space, which increases production costs and complexity.
Innovation Solution
The arrangement of two Wiegand sensor modules in a cross-shaped manner but axially spaced from each other eliminates the need for winding-free coil portions, allowing for the use of conventional, inexpensive and compact sensor modules, with a sensor module support body facilitating easy installation and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Wiegand sensor modules with winding-free coil portions are used, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent transitions from a planar arrangement where sensor modules must be coplanar with the excitation magnet to a three-dimensional arrangement where sensor modules can be positioned at different axial distances. This dimensional change eliminates the need for complex winding-free coil portions while maintaining detection precision.
2Measurement precision
If Wiegand sensor modules with winding-free coil portions are used, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
By positioning sensor modules at different axial distances from the excitation magnet, the patent enables use of conventional, easier-to-manufacture sensor modules without winding-free coil portions, thereby reducing manufacturing costs while preserving detection precision.
3Measurement precision
If sensor modules are arranged in cross-shaped manner at same axial position, then measurement precision is improved, but installation space requirement increases
Solution Approach 1:
The patent utilizes the axial dimension to separate sensor modules, allowing them to be arranged in a cross-shaped configuration without requiring all modules to occupy the same radial plane. This reduces the radial installation space while maintaining the cross-shaped detection geometry for precise measurement.
4Area of stationary object
If axially spaced Wiegand sensor modules are used, then installation space is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the sensor system into multiple independently positionable sensor modules at different axial levels. This segmentation allows each module to be positioned and adjusted separately, reducing the overall manufacturing precision requirements compared to a single-plane configuration while still achieving accurate differential detection.
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 results in a cost-effective and space-efficient rotary angle sensor system with simplified installation and reliable detection of shaft rotation, reducing manufacturing costs and installation space requirements.
Implementation Method 1
Wiegand sensor modules are here frequently used a sensor device which operate according to the Wiegand principle, i.e., utilize the Wiegand effect for detecting the excitation-magnetic field
Implementation Method 2
The pulse wire abruptly changes its magnetization under the influence of an external magnetic field, here the excitation-magnetic field, whereby a detectable voltage pulse is generated in the sensor coil
Data Source
AI summary
A magnet-based rotary angle sensor system for detecting a shaft rotation. The magnet-based rotary angle sensor system includes a rotatable excitation unit which is mounted to a shaft for rotation therewith, and a static sensor unit. The rotatable excitation unit includes at least one excitation magnet. The static sensor unit detects an excitation-magnetic field generated by the at least one excitation magnet. The static sensor unit includes a first Wiegand sensor module and a second Wiegand sensor module which are arranged in a cross-shaped manner and axially spaced from each other.