Segmented Magnetic Shield Assembly for Torque Sensor Attachment
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Solution Overview
Problem
The existing magnetic shield technologies for torque sensors in electric power steering systems are cumbersome and inefficient due to the need to deform iron plates around magnetic flux collecting rings, increasing the time and complexity of attachment.
Innovation Solution
A magnetic shield is designed with a divided portion that integrates into a symmetrical structure upon attachment, allowing for resin-molding with the sensor device, eliminating the need for deformation and simplifying the attachment process by forming a bypass for external magnetic fields and covering the magnetic flux collecting rings effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an iron plate is deformed along the outer circumference of the magnetic flux collecting rings to wind it around, then the magnetic shield can be attached to surround the magnetic flux collecting rings, but the shape of the iron plate varies in individual parts and the work becomes cumbersome
Solution Approach 1:
The magnetic shield is divided into a first magnetic shield and a second magnetic shield. The first magnetic shield surrounds the body of the magnetic flux collecting ring, while the second magnetic shield surrounds the magnetic flux collecting portion together with the magnetic sensor. This segmentation eliminates the need to deform a single iron plate and allows each shield to be independently attached, resolving the technical contradiction between reliable attachment and ease of manufacture.
2Reliability
If the iron plate is deformed to conform to the magnetic flux collecting rings, then the magnetic shield can be attached, but the period required for work increases and efficiency decreases
Solution Approach 1:
By dividing the magnetic shield into two separate shields, each can be attached independently without time-consuming deformation processes. The first magnetic shield is attached to surround the body of the magnetic flux collecting ring, and the second magnetic shield is attached to surround the magnetic flux collecting portion, significantly reducing the attachment period and improving productivity.
Solution Approach 2:
The magnetic shields are designed in advance as separate components with predetermined shapes that match the magnetic flux collecting ring structure. This preliminary preparation eliminates the need for on-site deformation and fitting, allowing for faster and more efficient attachment while ensuring reliable shielding.
3Object-affected harmful factors
If the magnetic shield is designed as a single integrated structure, then it can provide complete shielding, but the attachment process becomes complex and time-consuming
Solution Approach 1:
The magnetic shield is segmented into two functional parts: the first magnetic shield for surrounding the body of the magnetic flux collecting ring and the second magnetic shield for surrounding the magnetic flux collecting portion with the magnetic sensor. This segmentation reduces structural complexity while maintaining complete shielding coverage, as each segment can be independently optimized and attached.
Solution Approach 2:
Different regions of the magnetic shielding system are addressed with appropriately designed shield segments. The first magnetic shield is optimized for the body region, while the second magnetic shield is optimized for the flux collecting portion region. This local optimization provides effective shielding throughout without requiring a single complex 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 approach reduces the complexity and time required for attaching the magnetic shield, enhances the suppression of external magnetic field influence, and maintains the magnetic characteristics of the shield, thereby improving the efficiency and accuracy of torque detection.
Implementation Method 1
a magnetic shield that covers the outer circumference of the magnetic flux collecting rings to effectively prevent influence of an external magnetic field from an object other than a detection target
Data Source
AI summary
A magnetic shield includes a divided portion divided into a plurality of parts before attachment to a sensor device. The divided portion is integrated by bringing the plurality of parts close to or in contact with each other during the attachment to the sensor device. The divided portion in an integrated state includes a first shield portion that surrounds a body of a magnetic flux collecting ring from an outer side in a radial direction, and a second shield portion that surrounds a magnetic flux collecting portion of the magnetic flux collecting ring together with a magnetic sensor to extend outward in the radial direction from the first shield portion.