Magnetic Rotation Sensor Alignment via Partition Ring
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Solution Overview
Problem
Magnetic type rotation detection devices require high positional accuracy between the magnet body and the magnetic sensing element, which is labor-intensive to achieve, especially in environments with dust or moisture.
Innovation Solution
A magnetic type rotation detection device with a magnet body and magnetic sensing element aligned using a partition member and a ring, where the magnetic sensing element is positioned on the ring's center axial line, and the magnet body is inside the ring, allowing for high accuracy without extensive labor, and the magnetic sensing element is protected from dust and moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the magnet body and magnetic sensing element are positioned with conventional workings, then high positional accuracy is achieved, but considerable labor is required
Solution Approach 1:
A positioning pin is introduced as an intermediary component between the magnet body and magnetic sensing element. The positioning pin features a cylindrical shape with a centering groove that receives a centering tool, enabling automatic centering and alignment during assembly. This eliminates the need for complex conventional workings and significantly reduces labor while maintaining high positional accuracy between the magnet body and magnetic sensing element.
2Measurement precision
If multiple magnetic pole pairs are formed on the magnet body, then higher resolution is achieved, but the device complexity increases
Solution Approach 1:
Instead of increasing the number of magnetic pole pairs on the magnet body, the invention uses a single magnetic pole pair combined with a positioning pin that has a centering groove. The positioning pin creates a reference geometry that allows the magnetic sensing element to accurately detect position information. This approach copies the functionality of multiple pole pairs through geometric positioning rather than magnetic multiplication, reducing device complexity while maintaining measurement precision.
3Device complexity
If the magnetic sensing element is exposed to the environment, then the device structure is simpler, but sensitivity is lowered due to dust and moisture
Solution Approach 1:
A protective cover is introduced that encloses the magnetic sensing element while maintaining magnetic field transparency. The cover acts as a protective shell that prevents dust and moisture from contacting the magnetic sensing element, thereby maintaining sensitivity and reliability. The cover is designed to be non-magnetic and thin enough to allow magnetic field penetration while providing environmental protection.
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 precise alignment of the magnet body and magnetic sensing element with reduced labor, maintaining sensitivity and protecting the sensing element from environmental contaminants.
Implementation Method 1
a magnetic sensing element which detects an angular position or a rotating speed when the magnet body is rotated
Data Source
AI summary
A magnetic type rotation detection device may include a magnet body formed with a magnetic pole pair comprised of an “S”-pole and an “N”-pole and provided on a rotation body, a magnetic sensing element facing the magnet body in a rotation center axial line direction of the rotation body, a partition member disposed between the magnet body and the magnetic sensing element, and a ring fixed to a face of the partition member on a side where the magnet body is located. A center of the magnetic sensing element may be located on a center axial line of the ring. The magnet body may be disposed on an inner side of the ring in a non-contact state with the ring. A center of the magnet body may be located on the center axial line of the ring.