Long-Stator Linear Motor Control via Overlapping Measurement Sections
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Solution Overview
Problem
The control of long-stator linear motors is limited by the need for precise position and speed measurement, which can result in one-dimensional topology and inability to handle switches, leading to potential failures and inaccuracies in position determination.
Innovation Solution
Overlapping measurement sections in the movement direction allow for redundant measured values to be generated, enabling the determination of operating parameters by comparing deviations between these values, which can be used to improve position accuracy and detect errors or wear, even if one measurement section fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single measurement section is used to cover the entire transport path, then the system structure is simple, but the position determination accuracy decreases and the system cannot handle switches or topological changes
Solution Approach 1:
The transport path is divided into multiple measurement sections, each covering a specific segment. This segmentation allows each section to maintain high measurement precision for its local area while collectively covering the entire transport path, including switches and topological changes.
Solution Approach 2:
The patent introduces temporal dimension by implementing continuous overlapping measurement between sections. Instead of treating measurement sections as discrete spatial segments, the system uses time-continuous overlapping measurements to bridge gaps and maintain precision across the entire path.
2Device complexity
If measurement sections are arranged without overlap to cover the entire transport path, then the device complexity is reduced, but the reliability decreases and position determination fails at section boundaries
Solution Approach 1:
The patent implements overlapping measurement sections that extend beyond the boundaries of individual segments. This overlapping creates a buffer zone that prevents measurement failures at section boundaries, ensuring continuous and reliable position determination even when transport units transition between segments.
Solution Approach 2:
The system continuously compares position measurements from overlapping sections and uses feedback mechanisms to resolve discrepancies. This ensures that position determination remains reliable throughout the entire transport path, including at switch points and segment boundaries.
3Reliability
If redundant measurement sections with overlap are implemented, then the reliability and fault detection capability improve, but the device complexity increases
Solution Approach 1:
The overlapping measurement sections serve multiple functions simultaneously: they provide primary position measurement, enable fault detection through comparison, facilitate smooth transitions at segment boundaries, and maintain continuous coverage. This multi-functionality justifies the increased complexity by delivering multiple benefits from the same structural addition.
4Device complexity
If the entire transport path is covered by one measurement section, then the topology is simple, but the system cannot handle switches or multi-dimensional transport paths
Solution Approach 1:
The transport path is segmented into multiple measurement sections that can independently cover different segments. This segmentation enables the system to handle complex topologies including switches, junctions, and multi-dimensional paths, as each section can be configured to cover its specific segment while collectively representing the entire complex path.
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 method enhances the accuracy of position determination and fault detection, ensuring continuous operation of the long-stator linear motor by using redundant measurements and weighting factors to approximate the actual value, thus preventing system failure.
Implementation Method 1
Owing to the interaction of the (electro)magnetic fields of the magnets and the drive coils, a propulsive force acts on the magnets of the transport unit, which in turn moves the transport unit in the movement direction
Implementation Method 2
A measurement section comprises one or more measuring sensors for detecting a measured value. Each measured value represents an actual value of a physical quantity. For example, a position of a transport unit in the measurement section can be determined as a measured value
Data Source
AI summary
In order to improve control of a long-stator linear motor, a first measured value is ascertained in a first measurement section and a second measured value is ascertained in a second measurement section, in each case along a transport path in a movement direction. The first measurement section overlaps, in the movement direction, the second measurement section in an overlap region, and the first measured value and the second measured value represent the same actual value of a physical quantity. An operating parameter of the long-stator linear motor determined based on a deviation occurring between the first measured value and the second measured value.