Magnetic Sensor Initialization Conductor for Domain Wall Nucleation
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Solution Overview
Problem
Magnetic multi-turn sensors require initialization into a known magnetic state for accurate turn count monitoring, but existing methods are difficult to implement once the sensor package is installed in a system, necessitating large external magnetic fields.
Innovation Solution
A magnetic sensor system with an initialization device comprising a substrate and electrical conductors that generate a strong magnetic field upon current application, allowing domain wall nucleation in magnetoresistive elements, enabling easy initialization without external magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large external magnetic fields are used to initialize the sensor, then the sensor can be magnetically initialized into a known state, but the initialization process becomes difficult to implement once the sensor package is installed in a system
Solution Approach 1:
An initialization conductor is introduced as an intermediary component between the external initialization source and the magnetoresistive sensing elements. The conductor is positioned in close proximity to the sensing elements and converts electrical current pulses into localized magnetic fields, serving as a mediator that enables initialization without requiring direct application of large external magnetic fields to the installed sensor package
Solution Approach 2:
The patent replaces the need for external magnetic field generation equipment with an electrical initialization system. By applying current pulses to the initialization conductor, the system uses electrical energy to generate the necessary magnetic field locally, substituting complex external magnetic field application mechanisms with a simple electrical pulse delivery system
2Power
If the conductor is positioned close to the magnetic sensing device to generate strong magnetic field, then domain wall nucleation is effective, but the conductor may interfere with the normal operation of the sensor
Solution Approach 1:
The initialization conductor operates through periodic, pulsed current application rather than continuous operation. The conductor is activated only during initialization events to generate strong magnetic fields for domain wall nucleation, then remains inactive during normal sensor operation, thereby avoiding interference with ongoing measurements while still providing the necessary initialization capability
Solution Approach 2:
The conductor is strategically positioned and dimensioned to concentrate magnetic field generation in a localized region adjacent to the magnetoresistive sensing elements. This localized approach ensures that the strong magnetic field is confined to the initialization zone rather than affecting the entire sensor assembly, minimizing interference with normal operation while maintaining effective domain wall nucleation
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
Enables effective and easy initialization of magnetic multi-turn sensors within installed systems by generating a strong magnetic field locally, ensuring accurate turn count monitoring without the need for large external magnetic fields.
Implementation Method 1
the conductor is configured to generate a magnetic field when a current pulse is applied thereto, such that domain walls are generated in the plurality of magnetoresistive elements
Data Source
AI summary
The present disclosure provides magnetic sensor system that includes a magnetic sensing device comprising a magnetic multi-turn sensor, and an initialization device for setting the magnetic multi-turn sensor in a known state ready for use. The initialization device is in the form of a substrate, such as a printed circuit board, comprising one or more wires. A strong electrical pulse is applied to the one or more wires, which thereby generate a magnetic field that is strong enough to cause the magnetoresistive elements of the magnetic multi-turn sensor to be filled with domain walls, thereby magnetizing each element into an initialized state.