Mobile Body Position Detection with Adjustable Conversion Rate
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Solution Overview
Problem
In mobile body systems with linear motors and magnetic pole paths, varying pitch lengths make it difficult to detect the position of the mobile body with high accuracy, as existing systems assume a uniform pitch length, leading to inaccuracies when different pitch lengths are present.
Innovation Solution
The system includes a mobile body with a detector and a rate changing unit that adjusts the position conversion rate based on phase angle differences detected by multiple magnetic sensors, allowing for accurate position specification even with changes in pitch length, using a configuration with first and second magnetic pole sections and multiple detectors with different detection angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pitch length of the magnetic pole path is made uniform to the prescribed pitch length, then the mobile body can detect position with high accuracy using a magnetic sensor, but it becomes difficult to adapt to factory layouts where the magnetic pole path length varies
Solution Approach 1:
The patent applies dynamics by making the position conversion rate adjustable rather than fixed. The rate changing unit dynamically changes the position conversion rate based on the detected pitch length, allowing the system to adapt to different factory layouts while maintaining accurate position detection. This resolves the contradiction by enabling the system to be both precise and adaptable.
Solution Approach 2:
The patent changes the parameter of position conversion rate based on the detected pitch length. When the pitch length differs from the prescribed value, the rate changing unit adjusts the conversion rate accordingly, allowing accurate position detection across varying factory layouts. This parameter change enables the system to maintain measurement precision while gaining adaptability.
2Adaptability or versatility
If the magnetic pole path includes a section with a different pitch length from the prescribed pitch length, then the system can adapt to varying factory layouts, but the mobile body becomes unable to detect position with high accuracy in that section
Solution Approach 1:
The patent uses feedback by having the detector continuously detect the pitch length and feed this information back to the rate changing unit. Based on this feedback, the rate changing unit adjusts the position conversion rate to match the actual pitch length, ensuring accurate position detection even when the pitch length differs from the prescribed value.
Solution Approach 2:
The patent changes the position conversion rate parameter based on the actual pitch length detected in each section. This allows the system to adapt to varying pitch lengths while maintaining accurate position detection, resolving the contradiction between adaptability and measurement precision.
3Device complexity
If a fixed position conversion rate is used based on prescribed pitch length, then the system structure remains simple, but position detection accuracy deteriorates when the actual pitch length differs from the prescribed pitch length
Solution Approach 1:
The patent transitions from a static fixed conversion rate to a dynamic adjustable conversion rate. The rate changing unit enables the conversion rate to be adjusted based on detected pitch length, improving accuracy without significantly increasing system complexity. This resolves the contradiction by making the system adaptive while maintaining relative simplicity.
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
This configuration enables high-accuracy position detection of the mobile body by adjusting the position conversion rate, effectively handling changes in pitch length and maintaining accuracy across different sections of the magnetic pole path.
Implementation Method 1
The detector detects a phase angle in accordance with a magnetic flux of the magnetic pole path
Implementation Method 2
the linear motor is driven by a magnetic interaction with a magnetic flux of the magnetic pole path
Data Source
AI summary
A mobile body moves along a magnetic pole path. The magnetic pole path includes a first magnetic pole section and a second magnetic pole section. The mobile body includes a detector, a rate changing unit, and a position specifying unit. The detector detects a phase angle in accordance with a magnetic flux of the magnetic pole path. The rate changing unit changes a position conversion rate obtained by associating a phase angle of the magnetic pole path with a position of the magnetic pole path based on the phase angle detected by the detector. The position specifying unit specifies a position of the mobile body along the magnetic pole path based on the phase angle detected by the detector and the position conversion rate changed by the rate changing unit.