Magnetic Inductive Position Sensor Rotor Wing Alignment
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Solution Overview
Problem
Conventional magnetic inductive position sensors face issues with uneven magnetic induction characteristics due to non-uniform flatness of protrusively formed geometries on the rotor disk, leading to ripple phenomena in output signals and increased fabrication costs.
Innovation Solution
A magnetic inductive type position sensor design featuring a rotor with circumferentially formed wing members connected by a guide member to maintain uniform flatness, ensuring consistent alignment with a PCB's circuit pattern, thereby minimizing signal ripples and enhancing measurement reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If protrusively formed geometries are used on the rotor disk, then the position sensor can detect rotation position through magnetic induction, but the flatness of geometries cannot be uniformly maintained leading to signal ripple
Solution Approach 1:
The rotor is divided into multiple independent wing members (typically 3-12 blades) that are circumferentially arranged around the rotor body. Each wing member can be manufactured separately with consistent flatness, and their collective arrangement creates the necessary magnetic induction effect while maintaining uniform gap distances from the PCB, thereby eliminating signal ripple caused by non-uniform geometry flatness.
2Reliability
If fan-like geometries are formed on the rotor, then magnetic induction can occur for position detection, but gap consistency between PCB and geometries cannot be maintained
Solution Approach 1:
The wing members are designed to extend only partially from the rotor body surface, creating a controlled magnetic induction zone. This partial extension ensures that the gap between the PCB and the wing members remains consistent during rotation, while the circumferential arrangement of multiple wing members provides sufficient magnetic induction effect for reliable position detection without requiring excessive geometry protrusion.
3Device complexity
If conventional protrusively formed geometries are used, then the sensor structure is simple, but fabrication cost increases due to quality control issues
Solution Approach 1:
The wing members are pre-formed with precise flatness and uniform dimensions before being assembled onto the rotor body. This preliminary manufacturing of individual components with controlled quality ensures that when assembled, the overall rotor maintains consistent gap distances from the PCB throughout rotation, eliminating the need for costly post-assembly quality control and reducing overall fabrication costs while maintaining structural simplicity.
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 effectively maintains uniform sensor measurements by minimizing wing member deformation and maintaining a consistent gap between the rotor's wing members and the PCB's circuit pattern, reducing signal ripples and improving overall sensor reliability.
Implementation Method 1
a position of the rotor is detected by using a changing value of magnetic field generated during current conduction on the circuit pattern through interaction with the plurality of geometries
Data Source
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AI summary
Disclosed is a magnetic inductive type position sensor, the position sensor including at least one rotor body coupled to a rotation shaft to rotate in association with rotation of the rotation shaft and having a plurality of protrusively and circumferentially formed wing members, a PCB arranged in opposition to the rotor body, and a guide member connecting each distal end of the wing members to guide each of the wing members to be aligned on the same planar surface.