Moving Direction Detector Using Asymmetric Sensor Array and Delay Logic
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Solution Overview
Problem
Conventional moving direction detectors face challenges in accurately recognizing the position and moving direction of a magnetic moving body, particularly due to difficulties in determining the position of tooth-shaped protrusions based on the changing magnetic field.
Innovation Solution
A moving direction detector is designed with first and second groups of sensor elements arranged in a row along the moving direction, featuring signal processing units that convert output signals into rectangular waves, a moving direction detection unit with a delay function, and output processing units to determine the moving direction based on these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bridge circuits and comparison circuits are used to detect magnetic field changes, then the moving direction detector can detect voltage changes, but it cannot accurately recognize the position and moving direction of the magnetic moving body
Solution Approach 1:
The detector is divided into multiple sensor elements (first sensor element, second sensor element, third sensor element) arranged in a specific pattern. Each sensor element independently detects magnetic field components, and their outputs are processed separately before being combined to determine position and direction, enabling accurate recognition through segmented detection
Solution Approach 2:
The patent introduces a new dimension of detection by arranging sensor elements in a two-dimensional pattern (rather than a single line) and detecting multiple magnetic field components (Hx and Hy directions). This dimensional expansion allows the system to accurately determine both position and moving direction by analyzing the spatial distribution of magnetic field changes
2Measurement precision
If magnetoresistance elements are arranged in a row along the moving direction, then the detector can perceive magnetic field changes, but it cannot determine the position of tooth-shaped protrusions accurately
Solution Approach 1:
The sensor elements are arranged in an asymmetric pattern with specific spacing relationships: the first and second sensor elements are spaced at a first interval, while the second and third sensor elements are spaced at a second interval that is different from the first. This asymmetric arrangement creates unique magnetic field response patterns for different positions and directions, enabling accurate detection
Solution Approach 2:
The patent pre-establishes the relationship between sensor output signals and moving direction by defining specific comparison logic: when the absolute value of the difference between first and second sensor outputs is greater than the absolute value of the difference between second and third sensor outputs, one direction is determined; otherwise, the opposite direction is determined. This preliminary establishment of detection logic simplifies the overall system complexity
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 detector accurately recognizes the position and moving direction of the magnetic moving body, regardless of its moving direction, by generating output signals that correspond to the position and direction changes, allowing for precise determination.
Implementation Method 1
respective electrodes are formed at the ends of magnetoresistance elements included in a giant magnetoresistance element (referred to as a GMR, hereinafter) GMR as a magnetoelectric conversion element
Data Source
AI summary
Provided is an apparatus for detecting a moving direction that can accurately detect the position, regardless of the moving direction. The moving direction detector includes groups of sensor elements that face a moving body to output detection signals in accordance with travel of the moving body. The detector includes signal processing units that convert output signals of the groups of sensor elements into rectangular waves and a moving direction detection unit that outputs a signal corresponding to a moving direction of the moving body based on the detection signals from the groups of sensor elements. The moving direction detection unit includes a delay function of generating an output signal at a time instant that is delayed by a predetermined time from a time instant when a moving direction of the moving body is changed.