Magnetically Guided End-Effector Robot for Vacuum Wafer Alignment
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Solution Overview
Problem
Existing material-handling robots face challenges in efficiently manipulating and transferring payloads, such as semiconductor wafers, due to limitations in controlling the precise positioning and movement of end-effectors in multiple degrees of freedom, especially in vacuum environments.
Innovation Solution
A material-handling robot equipped with a magnetic support system and linear actuation system, featuring vertical and horizontal actuators, allows for precise control of a traversing platform's position and orientation through a combination of magnetic guidance and linear actuation, enabling independent adjustment of six degrees of freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional mechanical actuation systems are used to control end-effector positioning, then the structure is simple and easy to manufacture, but the precision and flexibility in controlling multiple degrees of freedom are insufficient
Solution Approach 1:
The patent replaces traditional mechanical actuation systems with a magnetic field-based actuation system. Magnets embedded in the end-effector interact with magnetic sensors on the arm to enable contactless, precise control of positioning and orientation. This substitution eliminates mechanical contact points, reducing wear and improving precision while maintaining manageable system complexity through field-based interaction.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, direction, distribution) to control the end-effector's position and orientation across multiple degrees of freedom. By varying magnetic field parameters dynamically, the system achieves precise control without requiring complex mechanical linkages, resolving the contradiction between precision and complexity.
2Ease of operation
If multiple actuators are added to control six degrees of freedom, then the manipulation precision is improved, but the device complexity and structural deflection increase
Solution Approach 1:
The magnetic field acts as a universal actuation mechanism that simultaneously controls all six degrees of freedom (three positional and three orientational) of the end-effector. Instead of requiring separate mechanical actuators for each degree of freedom, the magnetic field provides integrated control, reducing structural complexity while maintaining full manipulation flexibility.
Solution Approach 2:
The magnetic field serves as an intermediary between the control system and the end-effector, enabling indirect contactless actuation. This intermediary approach allows precise control of multiple degrees of freedom without the need for complex mechanical transmission systems, reducing structural deflection and overall system complexity.
3Reliability
If mechanical contact is used for actuation, then the control is direct and simple, but contamination and wear occur especially in vacuum environments
Solution Approach 1:
The patent replaces mechanical contact-based actuation with magnetic field-based actuation. This substitution eliminates physical contact between actuating components, preventing wear and contamination generation. The contactless magnetic interaction maintains high reliability in vacuum environments where traditional mechanical systems would degrade due to lack of lubrication and particle contamination.
Solution Approach 2:
The magnetic field actuation creates an effectively 'inert' interaction environment where no physical contact occurs between moving parts. This eliminates the generation of contaminating particles and wear debris, making the system highly reliable for operation in vacuum environments where contamination must be minimized.
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
Enables precise and flexible manipulation of payloads by compensating for misalignments and structural deflections, ensuring accurate delivery and alignment of end-effectors in vacuum environments.
Implementation Method 1
a magnetic support system comprising at least one guide attached to a frame of the arm assembly, a plurality of vertical actuators attached to the traversing platform, and a plurality of horizontal actuators attached to the traversing platform
Data Source
AI summary
An apparatus includes a drive unit; and an arm assembly connected to the drive unit, where the arm assembly comprises a traversing platform having an end-effector configured to carry a payload located thereon; a linear actuation system configured to drive the traversing platform in a linear direction; and a magnetic support system comprising at least one guide attached to a frame of the arm assembly, a plurality of vertical actuators attached to the traversing platform, and a plurality of horizontal actuators attached to the traversing platform, the plurality of vertical actuators being configured, with the at least one guide, to move the traversing platform in a vertical direction relative to the linear direction, and the plurality of horizontal actuators being configured, with the at least one guide, to move the traversing platform in a horizontal direction relative to the linear direction.