Gantry Motor Control Mode Switching for Axis Deviation Reduction
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Solution Overview
Problem
Gantry drive systems face challenges in accurately controlling the positional deviation between parallel axes, leading to inefficiencies in manufacturing processes such as semiconductor mounting and liquid crystal display manufacturing, due to individual motor differences and assembly inaccuracies.
Innovation Solution
A gantry drive system with a motor control system that switches between inter-axis compensation control mode and separation control mode, using mode switching units to adjust driving forces and control modes based on detected positions and rigidity evaluation, to minimize positional deviation and stabilize the rotational state of the gantry mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual motor control is used for each axis, then ease of control is improved, but inter-axis positional deviation increases due to motor differences and assembly inaccuracies
Solution Approach 1:
The system employs a feedback mechanism where the inter-axis positional deviation is detected by a deviation detector, and the detected deviation is fed back to the controller. The controller then generates a correction amount based on this feedback and applies it to adjust the driving forces of the motors, thereby reducing the positional deviation between axes.
Solution Approach 2:
The controller acts as an intermediary that receives deviation information from the deviation detector and translates it into correction amounts. This intermediary function allows the system to coordinate between individual motor control and inter-axis synchronization, resolving the contradiction by mediating the control signals to achieve both simplicity and precision.
2Manufacturing precision
If inter-axis compensation control is implemented to reduce positional deviation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions: it controls the driving forces of individual motors, detects inter-axis positional deviation through the deviation detector, calculates correction amounts, and applies synchronization control. This multi-functionality consolidates the control system into a single device, reducing overall system complexity while maintaining precision.
Solution Approach 2:
The system merges the individual motor control functions with the inter-axis synchronization control into a unified control framework. The controller integrates both the position control of individual motors and the deviation correction mechanism, combining multiple control objectives into a single coordinated system that reduces complexity.
3Adaptability or versatility
If mode switching is added to adapt control modes to gantry characteristics, then adaptability is improved, but device complexity increases
Solution Approach 1:
The control system is designed to be dynamic by incorporating mode switching capability. The controller can adaptively change between different control modes (such as individual control mode and synchronization control mode) based on the detected rigidity characteristics of the gantry mechanism. This dynamic adaptation allows the system to optimize performance for different operating conditions without requiring completely separate control systems.
Solution Approach 2:
The system changes control parameters dynamically by switching between different control modes. When the rigidity characteristics of the gantry mechanism are detected, the controller adjusts control parameters such as the level of synchronization control applied or the gain values, thereby adapting the control behavior to match the mechanical characteristics without adding substantial hardware complexity.
Data Source
AI summary
A gantry drive system includes: a first motor configured to drive a driving object along a first axis; a second motor configured to drive the driving object along a second axis parallel with the first axis; and a motor control system configured to control the first and second motors. The motor control system includes a mode switch that performs a switching between a first control mode in which a position of the driving object on each of the first and second axes is individually controlled while reducing an inter-axis positional deviation between the first and second axes, and a second control mode in which a rotational state of the driving object is controlled while controlling a position of the driving object, based on detected positions of the driving object on the first and second axes.