Long-Stator Linear Motor Switch Collision Zone Definition
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Solution Overview
Problem
Conveyor devices with long-stator linear motors face challenges in preventing collisions between transport units, especially at switches, where the movement paths diverge, and existing solutions do not effectively define collision zones to ensure safe passage without collisions.
Innovation Solution
Defining a collision zone at the switch by determining the lengths and positions of transport units as two-dimensional objects, allowing for arbitration logic to control access and maintain a minimum distance to prevent collisions, with the option to adapt collision zones for different combinations of transport units and switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transport units are allowed to move freely through switches to increase throughput, then productivity increases, but the risk of collision between transport units increases
Solution Approach 1:
The switch area is segmented into a collision zone with multiple sectors (first sector, second sector, third sector) and a safe zone. Transport units are restricted from entering the collision zone until specific conditions are met, while allowing simultaneous movement in different sectors to maintain throughput.
Solution Approach 2:
The system performs preliminary checks to determine whether a transport unit may enter the collision zone before allowing entry. The control unit evaluates the sector occupancy and safe zone status in advance, preventing collisions before they can occur.
2Reliability
If collision zones are defined to prevent collisions, then safety improves, but the complexity of the control system increases
Solution Approach 1:
The collision zone is divided into multiple sectors (angular dimensions) rather than a single linear zone. This dimensional approach allows the system to permit simultaneous entry from different directions while maintaining safety, reducing the need for complex sequential control.
Solution Approach 2:
The control unit performs multiple functions: it monitors transport unit positions, determines sector occupancy, evaluates safe zone status, and makes entry decisions. This multi-functionality consolidates control logic into a single unit, managing complexity rather than increasing it.
3Productivity
If multiple transport units are allowed to pass through switches simultaneously to optimize movement, then productivity increases, but the difficulty of detecting and preventing collisions increases
Solution Approach 1:
The collision zone is divided into multiple independent sectors that can be occupied simultaneously by different transport units. This segmentation allows the system to track and manage multiple units independently, simplifying collision detection compared to monitoring a single undivided zone.
Solution Approach 2:
The control unit continuously receives position information from transport units and updates the sector occupancy status in real-time. This feedback mechanism enables dynamic adjustment of entry permissions, allowing simultaneous passage when safe and preventing collisions when conditions change.
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
Ensures safe and collision-free movement of transport units through switches by defining specific collision zones, allowing multiple units to pass through simultaneously while maintaining a safe distance, thereby optimizing the movement of transport units and increasing conveyor throughput.
Implementation Method 1
A moving magnetic field is generated by the drive coils, which interacts with the excitation magnets on the transport units in order to move the transport units
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In order to reliably prevent a collision between two transport units (TEi, TEi+1) in the switch area during the operation of a conveyor system (1) in the form of a long stator linear motor with a switch (W), a collision zone (K) is provided in the switch area, wherein the collision zone (K) extends a length (L1, L2) from the start of the switch (B) on the respective conveyor section (FAk, FAk+1), and to define the collision zone (K) the transport units (TEi, TEi+1) are considered as two-dimensional objects and a position of the first transport unit (TEi) on the first conveyor section (FAk) is determined that the first transport unit (FAk) may occupy.so that the second transport unit (TEi+1) can be moved as a two-dimensional object along the second conveying section (FAk+1) through the switch (W) without collision, and a distance between this first position and the start of the switch (B) is determined, and at least this distance is used as the first length (L1).