Mover Identification via Unique Magnetic Fields
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Solution Overview
Problem
Existing motion control systems face challenges in accurately identifying and distinguishing between movers of different constructions, which is crucial for precise positioning and control, especially when variations occur due to manufacturing tolerances or different tooling requirements, and current methods like RFID can be time-consuming and intrusive.
Innovation Solution
A system that utilizes a position sensing system with unique magnetic fields generated by position magnets on each mover, allowing sensors to detect and differentiate the first mover based on distinct magnetic field characteristics, and optionally combines this with a drive system that uses differently polarized drive magnets to identify the first mover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID tags and readers are used to identify movers, then unique identification can be obtained, but the system becomes time-consuming and intrusive
Solution Approach 1:
The patent extracts the identification function from the drive magnets themselves by creating unique magnetic field patterns through different polarities or configurations. This eliminates the need for separate RFID tags and readers, allowing identification to occur naturally during the mover's operation without additional time-consuming steps.
Solution Approach 2:
The patent uses the magnetic field as an intermediary to carry identification information. Instead of direct RFID communication between tag and reader, the magnetic field generated by drive magnets serves as the medium that encodes and transmits mover identity information to sensors, enabling non-intrusive identification.
2Loss of information
If RFID tags are mounted on each mover and read during operation, then mover identity can be determined, but the process becomes intrusive and requires movers to pass near readers
Solution Approach 1:
The drive magnets on each mover generate their own unique magnetic field patterns that inherently encode identification information. The movers essentially identify themselves through their own operational magnetic fields, eliminating the need for external RFID tags and reducing system intrusiveness while maintaining complete information capture.
3Loss of time
If position magnets with unique magnetic fields are used to identify the first mover, then quick identification upon power-up is enabled, but the system requires detection of magnetic field differences
Solution Approach 1:
The patent applies local quality by creating distinct magnetic field characteristics at specific locations or configurations of drive magnets. Each mover or the first mover has localized variations in magnetic polarity or field strength that sensors can detect, enabling rapid identification through spatially differentiated magnetic signatures without requiring complex measurement systems.
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 quick and non-intrusive identification of movers upon power-up, allowing for precise compensation and control, reducing the need for unique identifiers and minimizing downtime, while accommodating variations in mover construction.
Implementation Method 1
Each position magnet generates a magnetic field. The sensors are spaced apart along the track, and each of the sensors generates a signal corresponding to the magnetic field generated by one of the position magnets.
Implementation Method 2
The track is made up of a number of track segments that, in turn, hold individually controllable electric coils. Successive activation of the coils establishes a moving electromagnetic field that interacts with the movers and causes the mover to travel along the track.
Data Source
AI summary
An improved system for determining the identification of movers in a motion control system is disclosed, where the motion control system includes multiple movers traveling on a track. The physical construction of at least one element of one of the movers is different on one mover than on each of the other movers. The control system for the movers detects the difference in construction and identifies the unique mover as a first mover. Each of the other movers along the track are assigned an identifier based on their relative position to the first mover. According to one embodiment, a position sensing system is utilized to identify the first mover. According to another embodiment, the drive system for the movers is utilized to identify the first mover. In still another embodiment, a combination of the position sensing system and the drive system is utilized to identify the first mover.