Torque Index Sensor Metal Cover Magnetic Shielding
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Solution Overview
Problem
The existing torque index sensors face challenges with magnetic field interference and thickness reduction due to the installation of magnetic field shielding structures, which limit their overall thickness and efficiency.
Innovation Solution
A torque index sensor design incorporating a rotor with a first magnet, a stator, a circuit board, first and second Hall sensors, a magnet seating member, and a metal second cover, where the magnet seating member and second magnet are positioned between the first and second covers, utilizing a metal cover to prevent magnetic field interference and reduce thickness by eliminating the need for a separate shielding plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic field shielding structure is separately provided between the torque sensor and the index sensor to prevent magnetic field interference, then magnetic field interference is prevented, but the overall thickness of the torque index sensor increases
Solution Approach 1:
The patent combines the magnetic field shielding function with the existing cover structure by making the cover body from a magnetic shield material. This integration eliminates the need for a separate shielding plate, thereby preventing magnetic field interference while avoiding the increase in overall thickness that would result from adding a distinct shielding component.
Solution Approach 2:
The cover structure serves dual functions: it provides structural enclosure for the sensor components and simultaneously acts as a magnetic field shield. By selecting magnetic shield material for the cover, the design achieves multi-functionality, reducing the need for additional dedicated shielding elements and maintaining compact dimensions.
2Length of moving object
If the overall thickness of the torque index sensor is decreased to make the magnet and magnetic field shielding plate closer, then compactness is improved, but magnetic leakage occurs
Solution Approach 1:
The magnetic shielding function is merged into the cover structure itself, which is positioned between the magnet and the external environment. This integration ensures that the shielding effect is maintained even when the overall thickness is reduced, as the cover material continuously blocks magnetic flux paths that would otherwise cause leakage.
Solution Approach 2:
The magnetic shield material in the cover acts as an intermediary between the magnet and the external environment. It provides a controlled path for magnetic flux, directing it through the shield material rather than allowing uncontrolled leakage, thereby enabling compact design without sacrificing magnetic field containment.
3Reliability
If a separate magnetic field shielding plate is provided, then magnetic field interference is prevented, but the device complexity increases
Solution Approach 1:
The patent merges the magnetic field shielding function with the existing cover structure by fabricating the cover from magnetic shield material. This consolidation reduces the total number of components, simplifies assembly procedures, and lowers manufacturing complexity while maintaining effective magnetic field interference prevention.
Solution Approach 2:
The cover structure is designed to perform multiple functions: mechanical enclosure, structural support, and magnetic field shielding. This multi-functionality reduces the need for separate dedicated shielding components, thereby simplifying the overall device structure and reducing assembly complexity.
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 design effectively prevents magnetic field interference while reducing the overall thickness of the torque index sensor, enhancing its performance and compactness without the need for additional shielding structures.
Implementation Method 1
a first Hall sensor and a second Hall sensor mounted on the circuit board, the first Hall sensor sensing magnetic flux of the stator, and the second Hall sensor sensing magnetic flux of the second magnet
Data Source
AI summary
A torque index sensor including a substrate; a first cover which accommodates the circuit board; a first hall sensor and a second hall sensor which are disposed on the circuit board; a magnet seating member which is coupled to the stator; a second magnet which is coupled to the magnet seating member; and a second cover made of a metal material coupled with the first cover. Further, the magnet seating member and the second magnet are disposed between the first cover and the second cover, the second cover comprises: an upper plate on which a through hole is formed; and a side plate which extends in the rotational axis direction from the upper plate, and the side plate comprises a groove formed at a position corresponding to the hall sensor.