Magnetic Position Detection Sensor with Bias-Field Linearization
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Solution Overview
Problem
Existing position detection systems using giant magnetoresistive effect elements suffer from insufficient linearity in output with respect to magnetic field strength, leading to inaccurate position detection.
Innovation Solution
A position detection system with a magnetic pole block and magnetic sensor arrangement where magnetic poles are alternately arranged, and a bias magnet applies a magnetic field aligned with the direction of magnetoresistive effect elements, improving linearity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If giant magnetoresistive effect elements are used for position detection, then position detection function is achieved, but output linearity with respect to magnetic field strength is insufficient
Solution Approach 1:
The patent applies a bias magnetic field to the giant magnetoresistive effect elements to change their magnetic state parameters. By controlling the bias magnetic field strength and direction, the magnetoresistive effect elements operate in a linear region of their hysteresis curve, improving output linearity with respect to magnetic field strength while maintaining position detection functionality
Solution Approach 2:
The patent introduces a bias magnet as an intermediary component that generates a bias magnetic field. This bias magnetic field acts as a mediator between the external magnetic field and the giant magnetoresistive effect elements, ensuring linear response by pre-establishing an optimal magnetic operating point for the elements
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 system enhances position detection accuracy by aligning the magnetic field direction with the magnetoresistive effect elements, resulting in improved linearity and more precise position sensing.
Implementation Method 1
The bias magnet applies, to the plurality of magnetoresistive effect elements, a magnetic field having an orientation toward one of two opposite sides of the first direction
Implementation Method 2
The magnetic sensor includes a plurality of magnetoresistive effect elements
Data Source
AI summary
A position detection system includes a magnetic pole block and a magnetic sensor. The magnetic pole block includes a plurality of magnetic poles arranged in a first direction. The plurality of magnetic poles are arranged such that N poles and S poles are alternately arranged as the plurality of magnetic poles in the first direction. At least one member selected from the magnetic pole block and the magnetic sensor is movable in the first direction with respect to the other member. The magnetic sensor includes a plurality of magnetoresistive effect elements and a bias magnet. The plurality of magnetoresistive effect elements are arranged side by side in the first direction. The bias magnet applies, to the plurality of magnetoresistive effect elements, a magnetic field having an orientation toward one of two opposite sides of the first direction.