Magnet Array Signatures for Independent Cart Identification
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Solution Overview
Problem
Independent cart systems face challenges in uniquely identifying vehicles due to manufacturing tolerances, leading to similar magnetic fields from nominally identical magnet arrays, and require separate identification tags and sensors, increasing costs.
Innovation Solution
Vary the construction of permanent magnet arrays on vehicles by altering dimensions, alignment, or orientation to generate unique magnetic fields, using these arrays for identification through interaction with electromagnetic fields generated by track coils and detected by sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate identification tags (RFID, magnets) are added to each vehicle, then vehicle identification capability is improved, but system cost and complexity increase
Solution Approach 1:
The magnet array on each vehicle serves dual purposes: it generates the magnetic field necessary for propulsion through interaction with track coils, and simultaneously provides a unique identification signature for vehicle recognition. This eliminates the need for separate identification tags and sensors, reducing system complexity while maintaining identification capability.
Solution Approach 2:
The identification function is merged with the propulsion function by using the same magnet array that interacts with track coils for both movement and identification. The unique magnetic field signature generated by each vehicle's magnet array serves as both the propulsion mechanism and the identification tag, combining two functions into one system.
2Measurement precision
If separate identification tags and sensors are added to each vehicle, then vehicle identification capability is improved, but manufacturing cost increases
Solution Approach 1:
The magnet array serves dual purposes as both propulsion mechanism and identification tag, eliminating the need for separate expensive identification components. This reduces manufacturing costs while maintaining the ability to uniquely identify each vehicle through its magnetic field signature.
Solution Approach 2:
Each vehicle's magnet array automatically provides identification information through its unique magnetic field signature without requiring additional active identification components. The vehicle's propulsion system itself generates the identification signal, eliminating the need for separate identification hardware and reducing manufacturing complexity.
3Ease of manufacture
If magnet arrays are made nominally identical for all vehicles, then manufacturing ease is improved, but vehicle identification accuracy deteriorates due to manufacturing tolerances
Solution Approach 1:
Instead of requiring all magnet arrays to be perfectly identical, the system accepts and utilizes the natural local variations in magnetic field strength and characteristics that arise from manufacturing tolerances. Each vehicle's unique magnetic field signature, resulting from slight variations in magnet dimensions, materials, alignment, or orientation, becomes the basis for identification rather than a manufacturing defect.
Solution Approach 2:
The system transitions from requiring identical magnetic field parameters to utilizing variations in magnetic field parameters (strength, orientation, distribution) as the basis for identification. By changing the approach from seeking uniformity to exploiting parameter variations, the system achieves both ease of manufacture and accurate identification.
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
Uniquely identifies vehicles without additional tags or sensors, reducing costs and ensuring accurate tracking and delivery to correct locations.
Implementation Method 1
a magnet array generating a magnetic field that interacts with an electromagnetic field generated by multiple coils to propel the mover along a track
Implementation Method 2
the magnetic field that interacts with the electromagnetic field generated by the coils to propel the mover along each of the track segments
Implementation Method 3
position sensors that are spaced apart along the length of each track segment and that generate a position feedback signal with a waveform that is a function of the magnetic field generated by the magnet array
Data Source
AI summary
An independent cart system includes multiple track segments, multiple movers, multiple position sensors, and a controller. Each track segment includes multiple coils along a length of the track segment and a segment controller operative to selectively energize the coils to generate an electromagnetic field. Each mover includes a magnet array having multiple magnets, where the magnet array generates a magnetic field that interacts with the electromagnetic field generated by the coils to propel the mover along the track segments. The position sensors are spaced apart along the length of each track segment and generate a position feedback signal with a waveform as a function of the magnetic field generated by the magnet array on each mover. The controller is operative to receive the position feedback signal from each position sensor and to determine a unique identifier for each mover as a function of the waveform of the position feedback signal.