Offset Detector Positioning for Curved Travel Control
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Solution Overview
Problem
Accurate position measurement of a moving body in a curved section is challenging due to varying centrifugal forces and imperfect guidance, making it difficult to achieve precise feedback control and stopping.
Innovation Solution
A system with a detector offset from the travel direction, a storage unit for center of control positions, and a control unit to accurately convert detected positions to the center of control, using magnetic sensors and a linear motor, with multiple detectors along the route to select the optimal sensor output and store positions for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the position of the moving body is detected using a detector at the center of control, then the position measurement is straightforward, but the measurement precision deteriorates in curved sections due to wobbling and centrifugal force changes
Solution Approach 1:
The detector is positioned laterally offset from the center of control in a direction perpendicular to the travel direction, transitioning from a one-dimensional center-aligned detection to a two-dimensional offset detection scheme. This spatial reconfiguration allows the detector to remain in a stable position while still accurately measuring the moving body's location through coordinate transformation.
Solution Approach 2:
A storage unit stores the relationship between detector positions and center of control positions, acting as an intermediary that maps offset detector readings to accurate center positions. This intermediary storage mechanism enables precise position calculation without requiring the detector to be physically located at the unstable center of control.
2Stability of the object's composition
If the radius of curvature is enlarged at the entrance and exit of the curved section, then the centrifugal force change is reduced, but the device complexity increases due to varying curvature requirements
Solution Approach 1:
The radius of curvature is varied along the trajectory - enlarged at the entrance and exit sections and reduced in the middle portion - to optimize centrifugal force characteristics. This parameter optimization reduces sudden centrifugal force changes at transition points while maintaining overall system simplicity through a systematic curvature profile.
3Measurement precision
If multiple detectors are provided along the travel route, then the position detection coverage is improved, but the device complexity increases
Solution Approach 1:
Multiple detectors are distributed along the travel route, with each detector responsible for a specific section. This segmentation allows comprehensive position detection coverage while maintaining manageable system complexity through modular detector units that can be independently configured and maintained.
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 high-precision travel and accurate stopping of the moving body in curved sections by accurately converting detected positions to the center of control, reducing wobbling and interference with linear motors.
Implementation Method 1
the detector is a magnetic sensor provided laterally to the linear motor provided on the travel route or the moving body, and is disposed so as to detect magnets or magnetic materials provided laterally to the linear motor provided on the moving body or the travel route
Data Source
AI summary
A detector detects positions of a moving body in a travel direction at a position shifted from a center of control of travel of the moving body in a direction different than the travel direction of the moving body. Positions of the center of control in the travel direction relative to the output of the detector is stored in a storage unit for at least a curved section of a travel route of the moving body, and the travel of the moving body is controlled by a controller, based on the positions of the center of control read out from the storage unit.