Planar Stage Moving Apparatus for Compact Machine Tools
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Solution Overview
Problem
Existing table moving units in machine tools, such as milling machines, require separate movement shafts for transverse and longitudinal movements, resulting in a complex and large-sized structure, which restricts the size reduction and accuracy of table transfer systems.
Innovation Solution
A planar stage moving apparatus using four linear motors with stator cores and permanent magnets, combined with an air bearing unit and linear encoder, allows for simultaneous transverse, longitudinal, and angular movement of the table on the same plane, reducing the space occupied by movement units and enhancing structural strength and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate movement shafts are used for transverse and longitudinal movements, then the table can be moved in multiple directions, but the structure becomes complex and large-sized
Solution Approach 1:
The patent combines multiple linear motors (first, second, third, and fourth linear motors) into a single integrated drive system that provides both transverse and longitudinal movement capabilities. Instead of using separate movement shafts for each direction, the multiple linear motors are arranged to work together on a common table, merging multiple movement functions into one compact system.
Solution Approach 2:
The table is designed to serve multiple functions simultaneously - it can move transversely, move longitudinally, and rotate, all through the coordinated action of the linear motors. This multi-functional table replaces what would traditionally require separate dedicated mechanisms for each movement type.
2Adaptability or versatility
If separate movement shafts are used for transverse and longitudinal movements, then the table can be moved in multiple directions, but the overall size of the system increases
Solution Approach 1:
The patent merges multiple movement functions into a single compact table assembly. The first and third linear motors provide transverse movement while the second and fourth linear motors provide longitudinal movement, all within the same spatial envelope, significantly reducing the overall system volume compared to separate movement shafts.
Solution Approach 2:
The patent transitions from a multi-dimensional arrangement of separate movement shafts to a planar configuration where multiple linear motors are arranged in two dimensions on the table. This dimensional reorganization allows multiple movement capabilities to coexist in a smaller footprint.
3Volume of moving object
If a compact table transfer system is designed, then the machine size is reduced, but the structural strength may be compromised
Solution Approach 1:
The table is constructed as a composite structure integrating multiple functional components - linear motors, air bearing units, and structural elements - into a unified assembly. This composite design maintains structural strength while minimizing overall volume, as each component serves multiple purposes simultaneously.
Solution Approach 2:
The table is divided into multiple functional segments (motor mounting regions, air bearing regions, structural support regions) that are independently optimized but work together as a unified strong structure. This segmentation allows each region to contribute to overall structural integrity while maintaining compact dimensions.
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 apparatus enables a compact and precise table transfer system capable of transverse, longitudinal, and angular movements, improving the dynamic characteristics and allowing for the design of smaller, more robust machine tools with high precision positioning.
Implementation Method 1
A planar stage moving apparatus according to the present invention includes: first to fourth linear motors for applying, between a base, i.e. a fixed body and a table, i.e. a movable body, a movement force to the table
Implementation Method 2
an air bearing unit provided between the base and the table to move the table under the influence of magnet fields
Data Source
AI summary
A planar stage moving apparatus for a machine includes: first to fourth linear motors for applying, between a base, i.e. a fixed body and a table, i.e. a movable body, a movement force to the table, each linear motor including a stator core on which a coil is wound and which is fixed to the base and a mover core to which a permanent magnet is attached and which is fixed to the table; an air bearing unit provided between the base and the table to move the table under the influence of magnet fields when currents are applied to the coils of the linear motors; and a linear encoder installed on one side of the table to measure movement of the table.