Rotating Frame Synchronization Control With Self-Updating Position Correction
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Solution Overview
Problem
Existing synchronization control techniques for rotating frames in heavy particle beam irradiation systems face challenges in achieving precise positioning due to synchronization deviations and the need for frequent correction of correction-value tables, which is time-consuming and less accurate.
Innovation Solution
A synchronization control apparatus that includes two arcuate rails, two rotating frames, two drive sources, and a system of subordinate and superior controllers, displacement sensors, and a correction-value table, which allows for synchronous driving of the rotating frames and precise positioning by continuously updating the correction-value table based on real-time feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If feedforward control using correction value is performed, then positioning accuracy is improved, but the correction-value table requires periodic correction which is time-consuming
Solution Approach 1:
The patent implements feedback control by measuring the actual position of rotating frames using encoders and comparing it with command positions. The position error is detected and used to update the correction-value table dynamically, eliminating the need for periodic manual corrections while maintaining high positioning accuracy.
Solution Approach 2:
The system performs self-correction by automatically updating the correction-value table based on real-time position error measurements. The correction mechanism operates autonomously during normal operation without requiring external intervention or periodic maintenance, making the system self-sufficient in maintaining accuracy.
2Reliability
If only one axis is controlled and moved to a specified position, then influence of external force is suppressed, but the technique cannot be applied to mechanisms that cannot be moved by only one axis
Solution Approach 1:
The patent creates a universal synchronization control system that can handle both single-axis and multi-axis mechanisms. The control apparatus measures position errors of multiple rotating frames simultaneously and generates appropriate correction values for each, making it adaptable to various mechanism configurations without requiring separate control strategies.
Solution Approach 2:
The system divides the control of multiple axes into independent position error measurements for each axis, while centrally coordinating the correction values. Each rotating frame's position is measured and corrected independently, allowing the system to suppress external force influences on each axis while maintaining overall synchronization.
3Manufacturing precision
If correction value is defined as relative position error between both axes, then synchronization is improved, but desired positioning cannot be achieved if absolute position of main axis deviates from command position
Solution Approach 1:
The patent merges relative position error measurement (for synchronization) with absolute position error measurement (for positioning accuracy). The control system simultaneously considers both the relative error between axes and the absolute error from command positions, combining these corrections to achieve both synchronization and accurate positioning.
Solution Approach 2:
The system transitions from considering only relative position errors (one dimension of control) to incorporating absolute position errors as an additional dimension. This dual-dimensional correction approach ensures that synchronization is maintained while absolute positioning accuracy is preserved, even when main axis deviations occur.
Data Source
AI summary
According to one embodiment, a synchronization control apparatus comprising: at least two subordinate controllers configured to control at least two drive sources while feeding back respective displacement amounts measured by at least two displacement sensors in such a manner that at least two rotating frames reaches a position of a target rotation angle indicating an inputted target-position command value; and at least two superior controllers corresponding to respective subordinate controllers, each of the superior controllers being configured to correct the target-position command value by using a correction-value table and output a corrected target-position command value to a corresponding subordinate controller, the correction-value table being a table in which correction values for correcting the target-position command value are registered in advance.