Compact Sliding System with Onboard Linear Motors
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Solution Overview
Problem
Existing sliding systems with onboard linear motors are bulky and space-hungry, making them unsuitable for compact applications in semiconductor fabricating machines and other assembly machines where multiple systems are required in close juxtaposition.
Innovation Solution
A sliding system design featuring a bed and two tables that move in perpendicular directions (X and Z) with independent linear motors, where the tables are arranged on the same side of the bed to minimize height and allow for compact construction, enabling efficient use in close proximity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sliding systems with linear motors are used, then position control and driving functionality are achieved, but the system becomes bulky and space-hungry
Solution Approach 1:
The patent combines the bed and table structures with the linear motor components into an integrated assembly. The field magnet is mounted on the bed while the armature assembly is mounted on the table, merging the structural support functions with the driving function into a single compact unit, thereby achieving precise position control without increasing overall system volume
Solution Approach 2:
The bed and table structures serve multiple functions: they provide mechanical support for the sliding table, serve as mounting bases for the linear motor components (field magnet and armature assembly), and act as part of the guiding mechanism. This multi-functionality reduces the need for separate components, thereby compacting the system while maintaining position control capability
2Area of stationary object
If multiple sliding systems are arranged in close juxtaposition, then space efficiency is improved, but the systems interfere with each other's operation
Solution Approach 1:
Each sliding system is designed as an independent modular unit with its own complete set of linear motor components (field magnet on bed, armature assembly on table). This segmentation allows multiple systems to be arranged in close juxtaposition while maintaining operational independence, as each unit's magnetic field and mechanical components are self-contained and do not interfere with adjacent units
Solution Approach 2:
The patent employs asymmetric arrangement of the field magnet and armature assembly on opposite sides of the sliding interface. This asymmetric configuration creates directional magnetic flux patterns that are contained within each individual sliding system, preventing magnetic field interference between adjacent systems while allowing compact arrangement
3Productivity
If high-speed and high-acceleration operations are implemented, then productivity is improved, but the system requires more space for component movement
Solution Approach 1:
The patent replaces traditional mechanical drive systems (gears, belts, linkages) with a linear motor system that uses electromagnetic forces for propulsion. The field magnet and armature assembly directly generate linear motion without intermediate mechanical components, enabling high-speed and high-acceleration operations within a compact space by eliminating the need for large mechanical transmission components
Solution Approach 2:
The linear motor system provides dynamically controllable force through electrical signal adjustment, allowing high acceleration and deceleration rates. The magnetic field strength and direction can be rapidly changed by adjusting the armature current, enabling high-speed operations without requiring excessive movement space, as the force application is direct and immediately responsive to control signals
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 a slim and compact design, allowing for precise position control in X and Z directions, reducing overall height by approximately 17 mm compared to previous versions, while supporting high-speed, high-acceleration operations and multiple system arrangements without increasing space requirements.
Implementation Method 1
a linear motor which comprises a field magnet and an armature assembly that are mounted on opposite sides of the bed and the table, respectively, and are effective only when a current is supplied to generate a magnetomotive force for propelling the table along the bed in a sliding direction
Implementation Method 2
a magnetic sensor secured to the bed in opposition to the field magnet to detect strength and direction of magnetic flux
Data Source
AI summary
A sliding system has an X-table and a Z-table, which are actuated by linear motors, respectively. The Z-table is arranged on the X-table at the same side of the X-table as a bed is laid. A linear motor is placed between the bed and the X-table while another linear motor is installed between the X-table and the Z-table. The X-table doubles as yokes for the linear motors. The sliding system constructed as stated earlier is made slim or compact in height or thickness.