Laminated Spiral Sensor Element for Power-Free Revolution Counting
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Solution Overview
Problem
Existing sensor elements for revolution counters require high expenditures to measure changes in magnetization caused by a passing magnetic field, making them inefficient for cost-effective magnetization storage and reading.
Innovation Solution
A sensor element with a laminated spiral structure that stores changes in magnetization without a power supply, featuring a circular field generator and electrical contacts for simple magnetization reading, utilizing the Giant Magneto Resistance (GMR) effect to count rotations without external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a laminated sensor element structure is used to store changes in magnetization, then the storage capability is improved, but the measurement expenditure increases significantly
Solution Approach 1:
The sensor element is divided into multiple functional layers (sensor layer, nonmagnetic layer, reference layer) with distinct roles. The sensor layer stores magnetization changes from passing magnetic fields, while the reference layer provides a stable reference. This segmentation allows independent optimization of storage and measurement functions, reducing overall system complexity and expenditure.
Solution Approach 2:
The invention transitions from measuring magnetization changes in a single dimension to utilizing three-dimensional laminated structure with multiple layers. By stacking sensor layers, nonmagnetic layers, and reference layers in three dimensions, the system achieves enhanced storage capability while maintaining measurement efficiency through the layered architecture.
2Use of energy by moving object
If the sensor element operates without power supply to store magnetization changes, then energy consumption is reduced, but the ability to read and count stored changes becomes more difficult
Solution Approach 1:
A nonmagnetic layer is introduced as an intermediary between the sensor layer and reference layer. This intermediary layer facilitates the GMR effect by allowing spin-dependent scattering of conduction electrons while maintaining electrical connectivity. The nonmagnetic layer enables the reading mechanism to function without requiring power supply to the sensor element itself, thus reducing energy consumption while maintaining measurement capability.
Solution Approach 2:
The invention replaces active power-consuming measurement mechanisms with a passive GMR-based resistance measurement system. Instead of requiring powered sensors to actively detect and read magnetization changes, the system uses the inherent giant magnetoresistance effect in the laminated structure, where resistance changes naturally occur due to relative magnetization orientations, enabling power-free operation.
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 spiral structure effectively stores and reads changes in magnetization with low expenditure, enabling efficient counting of rotations in a revolution counter, independent of external power supply, using the GMR effect for resistance measurement.
Implementation Method 1
a sensor layer, in particular a soft-magnetic sensor layer, which without a power supply is capable of causing a change in magnetization in the sensor element when a magnetic field is moved past the sensor element. Furthermore, the laminated structure is capable of storing a plurality of such changes.
Implementation Method 2
the number of the stored changes can be determined with the aid of the Giant Magneto Resistance (GMR) effect, the Tunnel Magneto Resistance (TMR) effect or the Colossal Magneto Resistance (CMR) effect.
Data Source
AI summary
A sensor element for a revolution counter includes a laminated structure suitable to cause a change in magnetisation in the sensor element without a power supply, simply by the displacement of a magnetic field past the sensor element. Moreover, the laminated structure is suitable for storing a plurality of such changes. The sensor element has a spiral structure.