Maglev Linear Transport Control for Stable Six-Axis Mover Positioning
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Solution Overview
Problem
Existing transport systems with movable magnet type linear motors face productivity issues due to contamination and shortened linear guide life from mechanical contact, and stability problems in controlling the distance between the mover and coils, leading to unstable transportation.
Innovation Solution
A transport system with a movable magnet type linear motor that uses a stator with multiple coils arranged in the transport direction, an acquisition unit for position and attitude data of the mover, and a control unit to adjust the force applied to the coils based on this data, enabling contactless transportation and stable attitude control in six axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a mechanical guiding apparatus such as a linear guide is used, then the transport system can be implemented with straightforward structure, but contamination is generated from sliding portions and the linear guide life is shortened due to friction at high speed
Solution Approach 1:
The patent replaces the mechanical linear guide system with a magnetic field-based guiding mechanism. The mover is guided by magnetic attraction forces from coils arranged along the transport path, eliminating mechanical sliding portions that generate contamination. This substitution maintains structural implementability while removing the harmful friction and contamination issues.
2Object-affected harmful factors
If a magnetic floating type transport apparatus with individual coil control is used, then contactless transportation is achieved, but stable transportation becomes difficult due to difficulty in controlling the distance between mover and coils
Solution Approach 1:
The patent implements a feedback control mechanism where the position and attitude of the mover are continuously detected by sensors, and this information is fed back to the control unit. The control unit adjusts the current applied to each coil based on the detected position and attitude, maintaining a constant distance between the mover and coils. This feedback loop ensures stable contactless transportation by dynamically compensating for position variations.
3Device complexity
If individual coils are controlled in a closed manner between mover and individual coils, then the system can be simplified, but stable transportation of the mover becomes difficult
Solution Approach 1:
The control unit receives position and attitude information from detection units and dynamically adjusts the current to each coil based on this feedback. This feedback mechanism enables the system to maintain stable transportation by compensating for position variations, while the integrated control unit keeps the overall system complexity manageable through centralized coordination of all coils.
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 solution enhances productivity by reducing contamination and extending linear guide life, while ensuring stable and precise transportation of the mover by controlling its position and attitude in six axes, thereby improving overall system performance.
Implementation Method 1
a stator that has a plurality of coils arranged in the transport direction and applies force to the mover by using the plurality of coils to which current is applied
Implementation Method 2
a magnetic floating type transport apparatus that can transport a mover in a contactless manner
Data Source
AI summary
A transport system includes: a mover that is movable in a transport direction; a stator that has a plurality of coils arranged in the transport direction and applies force to the mover by using the plurality of coils to which current is applied; an acquisition unit that acquires a position and an attitude of the mover moving in the transport direction; and a control unit that determines a current value applied to the plurality of coils and controls the force based on the position and the attitude of the mover.