Angled Magnetic Sensor for Rotation Detection Saturation
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Solution Overview
Problem
Conventional rotation detection devices using highly sensitive magnetoresistive effect elements experience decreased detection accuracy due to magnetic field saturation, and face challenges in maintaining a compact size, especially when installation space is limited.
Innovation Solution
The rotation detection device positions the magnetic sensor's detection portion to face the axial end face of the detection target member at an angle, maintaining a consistent distance while using a magnetoresistive effect element, which suppresses magnetic flux density changes and allows for a smaller sensor unit size without the need for bending connection terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection portion is positioned close to the detection target member to improve detection accuracy, then detection sensitivity is improved, but magnetic flux density change becomes too large causing saturation of the magnetic detection element and decreased detection accuracy
Solution Approach 1:
The patent changes the spatial arrangement from a conventional configuration where the detection portion faces the axial end face directly, to an angled configuration where the detection portion faces the axial end face at an angle. This dimensional change in orientation allows the detection element to be positioned at an optimal distance and angle to detect magnetic field changes without saturation, while maintaining detection accuracy.
2Object-affected harmful factors
If the detection portion is positioned far from the detection target member to reduce magnetic flux density change, then saturation is avoided, but the size of the sensor unit increases
Solution Approach 1:
By introducing an angled configuration in the spatial arrangement, the patent achieves a compact sensor unit size while avoiding saturation. The angle allows the detection element to be positioned optimally without requiring excessive distance, thus maintaining small sensor unit dimensions while preventing magnetic flux density saturation.
3Measurement precision
If the sensor unit is positioned far from the detection target member to avoid saturation, then detection accuracy is maintained, but this is not possible when installation space is narrow
Solution Approach 1:
The angled configuration allows the sensor unit to be positioned close to the detection target member within narrow installation spaces while maintaining detection accuracy. By utilizing the angular dimension, the system achieves optimal detection geometry without requiring large installation clearance, thus solving the conflict between limited installation space and detection accuracy.
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 enhances detection accuracy by reducing saturation effects and allows for a compact sensor unit design, even in narrow spaces, while maintaining detection efficiency and versatility.
Implementation Method 1
the magnetic detection element comprises a magnetoresistive effect element to detect a magnetic field in a direction perpendicular to a plate thickness direction of the detection portion
Data Source
AI summary
A rotation detection device includes a sensor unit including a magnetic sensor and a housing portion covering the magnetic sensor. The magnetic sensor includes a plate-shaped detection portion including a magnetic detection element to detect a magnetic field from the detection target member and connection terminals extending out of the detection portion. The magnetic detection element includes a magnetoresistive effect element to detect a magnetic field in a direction perpendicular to a plate thickness direction of the detection portion. The sensor unit is positioned such that a fore-end portion of the detection portion of the magnetic sensor faces toward an axial end face of the detection target member, the fore-end portion being an end portion located opposite to the side where the connection terminals extend out.