Rotary Speed Sensor Magnetic Panel for Larger Air Gap Accuracy
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Solution Overview
Problem
Existing rotary speed sensors face challenges in achieving a balance between maintaining measurement accuracy and ease of installation, as reducing the air gap for improved accuracy complicates the attachment process and design flexibility.
Innovation Solution
The rotary speed sensor design incorporates a magnetic panel with an opening that allows for a larger air gap by shaping the edge of the opening to direct magnetic flux more effectively towards the detection elements, using an R-shaped cross-sectional surface to enhance magnetic flux density without reducing the air gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the air gap is reduced to improve measurement accuracy, then detection accuracy is improved, but ease of attachment and design flexibility deteriorate
Solution Approach 1:
A magnetic panel is introduced as an intermediary component between the magnet and the magnetic detection element. This panel guides and concentrates magnetic flux toward the detection element, enabling accurate detection even with a larger air gap. The magnetic panel acts as a mediator that decouples the direct relationship between air gap size and detection accuracy.
Solution Approach 2:
The magnetic panel features a non-uniform cross-sectional shape with a larger outer diameter at the magnet side and a smaller inner diameter at the detection element side. This local variation in geometry optimizes magnetic flux distribution differentially across the panel, concentrating flux where needed while maintaining overall structural integrity and attachment flexibility.
2Ease of operation
If the air gap is increased to improve ease of attachment, then ease of attachment is improved, but measurement accuracy deteriorates
Solution Approach 1:
The magnetic panel serves as a mediator that enables the system to achieve both large air gap (for ease of attachment) and high detection accuracy simultaneously. By guiding magnetic flux through its structured geometry, the panel ensures sufficient flux reaches the detection element even when the air gap is enlarged.
Solution Approach 2:
The magnetic panel's cross-sectional dimensions are carefully designed to change along its length. The outer diameter is larger at the magnet interface and tapers toward the detection element side. This parameter variation optimizes magnetic flux concentration and distribution, allowing the system to maintain detection accuracy while accommodating larger air gaps.
3Measurement precision
If a magnetic panel with opening is arranged to secure measurement accuracy, then measurement accuracy is improved, but design flexibility deteriorates
Solution Approach 1:
The magnetic panel is segmented into distinct functional zones: an outer peripheral portion interacting with the magnet and an inner peripheral portion interacting with the detection element. The opening is strategically positioned to allow magnetic flux passage while the segmented structure provides design flexibility in optimizing flux paths.
Solution Approach 2:
The magnetic panel exhibits local quality variations through its non-uniform cross-section and strategic opening placement. The outer diameter varies along the length, and the opening is positioned to optimize flux distribution. This localized optimization maintains design flexibility while ensuring measurement 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 design maintains detection accuracy while allowing for a larger air gap, simplifying installation and enhancing design flexibility, thus improving the ease of attachment and operational efficiency.
Implementation Method 1
a magnetic detection element to detect a magnetic flux density
Implementation Method 2
shaping the edge of the opening to direct magnetic flux more effectively towards the detection elements
Data Source
AI summary
A rotary speed sensor according to an embodiment includes: a sensor component including magnetic detection elements; a magnet on a bottom surface side of the sensor component; and a magnetic panel arranged between the bottom surface of the sensor component and the magnet and made of a magnetic material. An opening penetrating in a first direction that is an arrangement direction of the sensor component, the magnetic panel and the magnet is formed in the magnetic panel. A wall surface of the opening includes: an inner wall having a constant diameter; and an edge being closer to the sensor component than the inner wall and having a variable diameter. The farther from the bottom surface in the first direction a part of the edge is, the closer to a center of the opening the part is.