Torque Sensor Shielding Static Electricity and Noise
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Solution Overview
Problem
Conventional torque sensors using magnetic sensors are prone to damage and malfunction due to electrostatic energy and noise, as these can pass through the sensor body, causing dielectric breakdown or erroneous detection.
Innovation Solution
The detection device incorporates magnetism collection rings and a shielding member to direct static electricity and noise to a grounded member, preventing them from passing through the sensor body by forming a conductive path with the lowest resistance, thus protecting the sensor from damage and ensuring accurate magnetic flux detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic sensor is disposed in the magnetic flux path for detection, then the sensor can detect magnetic flux density accurately, but static electricity and noise can pass through the sensor causing damage or malfunction
Solution Approach 1:
The patent divides the sensor assembly into functionally separate components: the magnetic sensor element for detection and the conductive member (shielding structure) for electrostatic protection. This segmentation allows the sensor to be positioned in the magnetic flux path for accurate detection while the conductive member intercepts static electricity and noise before they reach the sensor, resolving the contradiction between detection accuracy and damage resistance
Solution Approach 2:
The conductive member acts as an intermediary between the magnetic flux path and the magnetic sensor. It is positioned to intercept static electricity and electromagnetic noise, providing a protective barrier that allows the sensor to remain in the magnetic flux path for accurate detection without being exposed to harmful electrical disturbances
2Reliability
If a conductive path for static electricity is provided through the sensor body, then electrostatic energy can be discharged, but the sensor may still suffer dielectric breakdown or noise interference
Solution Approach 1:
The patent extracts the electrostatic protection function from the sensor body itself and assigns it to a separate conductive member (shielding structure). This conductive member is specifically designed to intercept and discharge static electricity through a dedicated path that does not involve the sensor's dielectric components, thereby preventing dielectric breakdown while still providing electrostatic discharge capability
Solution Approach 2:
The conductive member converts potentially harmful static electricity and electromagnetic noise into a beneficial protective mechanism. By providing a low-resistance path for electrostatic discharge through the conductive shielding structure, the system safely dissipates harmful electrical energy before it can damage the sensor, transforming a harmful factor into a protective feature
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 effectively restricts damage to the sensor and prevents malfunction by allowing static electricity and noise to escape to the ground without passing through the sensor body, ensuring reliable torque detection in applications like electric power steering systems.
Implementation Method 1
a magnetism-collecting ring for collecting magnetic flux generated by the member
Implementation Method 2
The Hall IC includes an element part that detects magnetic flux
Data Source
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AI summary
A detection device includes a conductive member, a facing member, and a sensor portion. The conductive member is provided to be conductive to a grounded member having a ground potential. The sensor portion includes a sensor element, a sensor main body, and a grounded terminal. The sensor element is disposed in a sensor placement region which is located between the conductive member and the facing member and in which a distance between the conductive member and the facing member is shortest. The conductive member is provided to be conductive to the grounded terminal or a grounded wiring portion connected to the grounded terminal in a conductive region different from the sensor placement region. Accordingly, static electricity and noise escape to the grounded member without passing through the sensor main body. Therefore, damage to and malfunction of the sensor are restricted.