Dynamic Master-Slave Control for Magnetic Drive Conveyor
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Solution Overview
Problem
Magnetic drive conveyors in packaging machines have not fully realized their potential due to a static control approach that does not adequately exploit their flexibility and configurability, resulting in performance similar to or worse than conventional multi-axis systems, and higher costs.
Innovation Solution
Implementing a dynamic master/slave configuration between the motion control of the magnetic drive conveyor and the packaging machine's control system, allowing for real-time interaction and dynamic reconfiguration of the conveyor's motion parameters based on specific work stations and machine functions, optimizing performance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static control approach is used for magnetic drive conveyor, then the control system is simpler to implement, but the flexibility and productivity are not fully exploited
Solution Approach 1:
The patent implements a dynamic master/slave configuration where the control system can switch between master and slave modes based on operational requirements. The magnetic drive conveyor operates in slave mode during work steps and master mode during return stroke, allowing the system to adapt its control architecture dynamically rather than being statically configured, thereby achieving flexibility without permanent complexity
Solution Approach 2:
The control system dynamically changes operational parameters including speed, acceleration, and control mode (master/slave) based on the operational phase. During work steps, the system uses one set of parameters with the packaging machine as master, while during return stroke, it switches to different parameters with the conveyor as master, optimizing performance for each phase without requiring permanent complex configuration
2Productivity
If a static law of motion is defined for movers, then the control programming is simpler, but the productivity and speed optimization are limited
Solution Approach 1:
The patent implements periodic changes in the law of motion for the movers, switching between different motion profiles depending on the operational phase. During work steps, movers follow one motion pattern, while during return stroke, they follow an optimized pattern with different speed and acceleration characteristics, thereby periodically optimizing productivity without requiring permanently complex control
Solution Approach 2:
The motion control system dynamically adjusts the law of motion parameters based on real-time operational requirements. The system can modify speed profiles, acceleration rates, and positioning parameters on-the-fly during different work steps and return strokes, achieving high productivity through adaptive motion control rather than static pre-programming
3Speed
If magnetic drive conveyor is used instead of conventional conveyor belts, then the speed and positioning precision are improved, but the control integration with packaging machine becomes more complex
Solution Approach 1:
The patent introduces a master/slave control interface as an intermediary layer between the magnetic drive conveyor controller and the packaging machine controller. This intermediary mechanism standardizes the interaction protocol, allowing high-speed magnetic drive conveyors to integrate with packaging machines through a well-defined control interface that manages the complexity of real-time coordination
Solution Approach 2:
The control integration dynamically adapts the master/slave relationship based on operational context. During work steps, the packaging machine controller acts as master and the conveyor as slave, enabling precise positioning at high speed. During return stroke, the roles can reverse or operate independently, allowing the high-speed capabilities of the magnetic drive conveyor to be fully utilized without permanent complex integration
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 approach enhances the integration of magnetic drive conveyors in packaging machines, increasing flexibility, productivity, and reducing errors, while fully exploiting their advantages such as speed and precise positioning, thus improving overall performance and cost-effectiveness.
Implementation Method 1
The movement of the movers along the path is controlled electromagnetically. Each mover comprises at least one reactive element to interact electromagnetically with active elements incorporated in at least part of the path. The interaction between said active and reactive elements propels the movers
Implementation Method 2
The active elements integrated in the conveyor are normally represented by windings capable of generating a magnetic field when excited by an electric current
Data Source
AI summary
Packaging machine of articles into containers, comprising a plurality of work stations, each work station comprising one or more working devices of the packaging machine; a conveyor of containers using movers and a linear motor, comprising a path and a plurality of independently controllable movers, wherein the control system of the machine is configured so as to dynamically vary a master/slave configuration between the motion control of the movers on the path, and the control of the working devices of the packaging machine.