Stacked Magnetic Sensor Cable for Compact Rotation Detection
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Solution Overview
Problem
Rotation detection devices for wheels face challenges in maintaining a small size while incorporating multiple magnetic sensors for accurate and redundant rotational speed measurement, as adding multiple sensors increases the device's size, making it difficult to fit into sensor-holding holes.
Innovation Solution
A rotation detection device with a detected member having multiple magnetic poles on a rotating member and a sensor section on a stationary member, featuring stacked, plate-shaped magnetic sensors with varying sensitivity, where the sensor farthest from the detected member has higher sensitivity, allowing for compact design and accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic sensors are mounted on the sensor section to improve detection accuracy and redundancy, then the rotational speed detection accuracy and reliability are improved, but the size of the sensor section increases making it impossible to insert into the sensor section-holding hole
Solution Approach 1:
The patent transitions from arranging multiple magnetic sensors in a planar configuration to stacking them in the thickness direction (vertical dimension). This dimensional change allows multiple sensors to be accommodated within a compact footprint, reducing the sensor section's horizontal size while maintaining multi-sensor functionality for improved detection accuracy and redundancy.
Solution Approach 2:
The patent implements a nested structure where multiple magnetic sensors are stacked one above another in the thickness direction, with each sensor nested within the vertical space occupied by the sensor section. This nesting approach allows multiple sensing elements to occupy a compact volume, enabling the sensor section to fit within the sensor section-holding hole while maintaining multiple sensors for enhanced measurement precision.
2Reliability
If multiple magnetic sensors are mounted to improve redundancy in case of sensor failure, then the reliability of rotational speed measurement is improved, but the device complexity and size increase
Solution Approach 1:
By stacking sensors in the thickness direction rather than spreading them horizontally, the patent reduces the complexity of routing multiple sensors across a large area. The vertical stacking simplifies the overall layout and connection architecture while maintaining multiple sensing elements for redundancy and improved reliability.
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
The solution enables a compact rotation detection device with multiple sensors for enhanced accuracy and redundancy, ensuring reliable rotational speed measurement while maintaining a small size, even when one sensor fails, thus improving reliability and detection precision.
Implementation Method 1
a magnetism detection element for detecting a magnetic field from the detected member
Data Source
AI summary
A cable with sensor, including a cable including a plurality of electric wires and a sheath collectively covering the plurality of electric wires, and a sensor section provided at an end of the cable. The sensor section includes a plurality of magnetic sensors each including a detection section that includes a magnetism detection element and a cover covering the magnetism detection element, and a housing portion coating the plurality of magnetic sensors, the plurality of electric wires, and the sheath. The cable is extending out of the housing portion. The respective detection sections are arranged to be aligned with each other in a same direction as an extending direction of the cable from the housing portion of the cable.