Sensor Device Outer Inner Collector Segmentation
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Solution Overview
Problem
The existing sensor devices in power steering systems face challenges in accurately measuring the torsion of a torsion bar due to external magnetic fields affecting the magnetic flux and output values.
Innovation Solution
A sensor device design that includes a rotor, a stator, first and second outer collectors, first and second inner collectors, and Hall sensors, where the outer collectors act as shields to external magnetic fields, and the inner collectors are positioned to transmit magnetic fields to the Hall sensors effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the collector is disposed outside the stator teeth to simplify structure, then the device complexity is reduced, but external magnetic fields pass through the collector causing sensor output value changes and reducing measurement precision
Solution Approach 1:
The collector is divided into outer collectors and inner collectors with different functions. Outer collectors serve as magnetic shields positioned away from the stator teeth, while inner collectors are positioned closer to transmit magnetic fields to the Hall sensor. This segmentation allows each part to optimize its position for its specific function, resolving the contradiction between structural simplicity and measurement precision.
Solution Approach 2:
Inner collectors act as intermediaries between the stator teeth and the Hall sensor. They transmit the magnetic field generated by the stator while being shielded from external magnetic fields by the outer collectors. This intermediary structure allows the Hall sensor to accurately measure the torsion-related magnetic field changes without direct exposure to external magnetic interference.
2Device complexity
If the collector serves as a passageway for external magnetic fields, then magnetic flux transmission is simplified, but the sensor output value changes due to external magnetism affecting measurement precision
Solution Approach 1:
The collector system is segmented into outer and inner collectors with distinct roles. Outer collectors block external magnetic fields from reaching the sensing area, while inner collectors transmit the useful magnetic field from the stator to the Hall sensor. This segmentation allows the system to maintain simple magnetic flux transmission paths while preventing external magnetic interference from affecting measurement precision.
3Volume of moving object
If outer collectors and inner collectors are disposed close together to reduce space, then the device volume is reduced, but assembly complexity increases
Solution Approach 1:
The collector system is segmented into separate outer and inner collectors that can be manufactured and positioned independently. This segmentation allows for optimized spatial arrangement that minimizes volume while maintaining adequate spacing for assembly. The modular design enables easier manufacturing and assembly compared to a fully integrated structure.
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 shields the Hall sensors from external magnetic fields, reducing their impact on the sensor output and allowing for more accurate measurement of torsion, while also simplifying assembly by separating the outer and inner collectors.
Implementation Method 1
a Hall sensor disposed between the first inner collector and the second inner collector
Implementation Method 2
the outer collectors act as shields to external magnetic fields, and the inner collectors are positioned to transmit magnetic fields to the Hall sensors effectively
Data Source
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AI summary
An embodiment may provide a sensor device including a rotor, a stator disposed to correspond to the rotor, first and second outer collectors disposed at one side of the stator, first and second inner collectors disposed between the first and second outer collectors, and a Hall sensor disposed between the first inner collector and the second inner collector.