Magnetic Angle Detection Shielding Against Disturbance Fields
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Solution Overview
Problem
Existing angle detection apparatuses face challenges in achieving high detection accuracy due to interference from disturbance magnetic fields and inefficient application of magnetic flux.
Innovation Solution
The apparatus includes a magnetic detection element surrounded by a magnetic shield and a magnetic field generator magnetized along a specific direction, with a yoke structure that is rotatable and curved in an arc shape, reducing disturbance fields and enhancing magnetic flux density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic detection element is used for angle detection, then detection capability is provided, but detection angle errors increase due to disturbance magnetic fields
Solution Approach 1:
A magnetic shield is introduced as an intermediary component between the magnetic detection element and the external environment. The shield blocks disturbance magnetic fields from reaching the detection element, thereby improving measurement precision without affecting the operational magnetic field needed for detection.
Solution Approach 2:
The harmful disturbance magnetic fields are extracted or removed from the detection path by using the magnetic shield to redirect them away from the magnetic detection element, allowing the detection system to operate in a magnetically protected zone.
2Object-affected harmful factors
If a magnetic shield surrounds the magnetic detection element, then protection from disturbance fields is achieved, but magnetic flux absorption by the shield may occur
Solution Approach 1:
The magnetic shield is designed with non-uniform thickness, having greater thickness at positions where disturbance magnetic fields are stronger and thinner where operational magnetic flux needs to pass through. This local variation in thickness optimizes the balance between shielding effectiveness and magnetic flux transmission.
Solution Approach 2:
The thickness parameter of the magnetic shield is varied continuously or discretely around the detection element to optimize performance. By changing the thickness parameter locally, the shield provides enhanced protection where needed while minimizing interference with the operational magnetic field.
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 improves detection accuracy by shielding from disturbance fields and maintaining high magnetic flux density, reducing detection angle errors to within ±0.5 degrees even under 3000 A/m interference.
Implementation Method 1
The magnetic field generator is magnetized along a first direction and generates a magnetic field to be applied to the magnetic detection element
Implementation Method 2
a magnetic detection element detecting magnetism
Implementation Method 3
The first magnetic shield surrounds the magnetic detection element along a plane orthogonal to the first direction
Data Source
AI summary
An angle detection apparatus includes a magnetic detection element, a magnetic field generator, and a first magnetic shield. The magnetic field generator is magnetized along a first direction and generates a magnetic field to be applied to the magnetic detection element. The first magnetic shield surrounds the magnetic detection element along a plane orthogonal to the first direction. The magnetic field generator and the magnetic detection element are rotatable relative to each other around a rotation axis along the first direction.