Wiegand Sensor Magnetic Shielding for Interference
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Solution Overview
Problem
Magnetic field sensors, particularly Wiegand sensors, in rotation angle measurement systems are susceptible to external magnetic interference fields, leading to measurement errors when used near electric motors or generators, as the magnetic fields generated by these devices interfere with the sensor readings.
Innovation Solution
A magnetic shielding arrangement made from high magnetic permeability materials is implemented around the Wiegand sensor, with shielding elements positioned radially inside, outside, and on both axial sides to effectively guide external magnetic interference fields around the sensor, ensuring accurate and interference-free detection of shaft rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic shielding arrangement is added to shield the Wiegand sensor against magnetic interference fields, then measurement precision is improved, but device complexity increases
Solution Approach 1:
A magnetic shielding arrangement made from high-permeability material is introduced as an intermediary component between the Wiegand sensor and external magnetic interference fields. This shielding arrangement acts as a mediator that guides magnetic flux away from the sensor, enabling accurate measurements in magnetically noisy environments without requiring the sensor to be physically isolated from the interference source
Solution Approach 2:
The magnetic shielding arrangement converts the harmful external magnetic interference fields into a beneficial effect by utilizing the high-permeability material to guide and concentrate the magnetic flux. Instead of simply blocking the interference, the shielding structure redirects the magnetic fields along controlled paths that bypass the sensor, transforming the interference into a manageable and predictable magnetic flux pattern
2Reliability
If the magnetic shielding arrangement is made from material with high magnetic permeability, then shielding effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The magnetic shielding arrangement utilizes materials with high magnetic permeability parameters to maximize shielding effectiveness. By selecting materials with appropriate permeability values, the design optimizes the magnetic flux guidance capability while controlling material costs. The shielding structure is designed to achieve sufficient shielding performance with cost-effective high-permeability materials rather than requiring expensive specialized materials
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 provides exact and interference-free detection of shaft rotation even in the presence of strong magnetic interference fields, enhancing the reliability and accuracy of the rotation angle measurement system.
Implementation Method 1
at least one magnetic shielding arrangement for the at least one Wiegand sensor, which shielding assembly is made from a material having a high magnetic permeability
Implementation Method 2
The at least one magnetic shielding arrangement is made from a material having a high magnetic permeability
Implementation Method 3
the magnetic field of the sensor magnets is detected by the sensor unit
Data Source
AI summary
A rotation angle measurement system for detecting a rotation of a shaft. The rotation angle measurement system includes the shaft which extends in an axial direction, a rotor unit having a sensor magnet, a stationary stator unit having a multi-turn sensor unit which is arranged radially spaced apart from the shaft and which has a Wiegand sensor, and a magnetic shielding arrangement for the Wiegand sensor. The rotor unit is connected to the shaft to rotate therewith and radially surrounds the shaft. The multi-turn sensor unit functionally interacts with the sensor magnet to detect revolutions thereof. The magnetic shielding arrangement is made from a material having a high magnetic permeability. The magnetic shielding arrangement includes shielding elements which are arranged to surround the Wiegand sensor on a radial inside, on a radial outside, on a first axial side, and on a second axial side thereof.