Linear Motor Transport With 3-Axis Magnetic Guidance
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Solution Overview
Problem
Existing transport systems with movable magnet type linear motors face issues such as contaminant generation from mechanical contact, reduced productivity, and shortened linear guide life due to increased friction during high-speed transportation.
Innovation Solution
A transport system incorporating a mover with at least one magnetic body, a stator with multiple coils arranged to face the magnetic body, and a control unit that manages current to the coils to apply forces in three directions, enabling contactless and stable transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guiding apparatus such as a linear guide is used in a transport system with a movable magnet type linear motor, then the transport system can provide mechanical guidance and support, but contaminants are generated from sliding portions causing deteriorated productivity and shortened linear guide life due to increased friction at high speed
Solution Approach 1:
The patent replaces the mechanical contact-based linear guide with a magnetic field-based guiding system. The stator generates magnetic fields that interact with magnets on the mover to provide guidance forces without physical contact, eliminating wear, friction, and contaminant generation while maintaining reliable positioning and support during high-speed transportation.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the stator and mover to transmit guidance forces without direct mechanical contact. The magnetic field acts as a mediator that transfers the necessary guidance and support functions while avoiding the harmful effects of mechanical sliding and friction.
2Ease of operation
If magnets are arranged in divided regions in a plane for transport direction and orthogonal direction, then the mover can be transported, but there is a bias in the force per unit current applied to the coil making it difficult to stably transport the mover
Solution Approach 1:
The patent applies different magnet arrangements to different regions of the mover based on local requirements. Magnets are strategically positioned and oriented to generate specific force components in different areas, allowing the system to counteract biases and achieve stable six-axis control without requiring complex coil arrangements throughout the entire structure.
Solution Approach 2:
The patent transitions from two-dimensional planar magnet arrangements to three-dimensional spatial configurations. By arranging magnets and coils in three dimensions with different orientations and positions, the system can generate forces in multiple directions including orthogonal and diagonal directions, eliminating the bias problem inherent in planar arrangements.
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
The system achieves stable and contactless transportation of movers, even for small movers or those with restricted stator arrangements, by applying forces in multiple axes, thereby improving productivity and extending the life of the transport system components.
Implementation Method 1
a stator that includes a plurality of coils arranged in a first direction to be able to face the at least one magnetic body and applies force to the at least one magnetic body by the plurality of coils to which current is applied
Data Source
AI summary
A transport system includes: a mover that includes at least one magnetic body; a stator that includes a plurality of coils arranged in a first direction to be able to face the at least one magnetic body and applies force to the at least one magnetic body by the plurality of coils to which current is applied; and a control unit that controls the current applied to the plurality of coils to apply the force to the at least one magnetic body in the first direction, a second direction crossing the first direction, and a third direction crossing the first direction and the second directions.