Workpiece Rotation Positioner Control for Bending Force Limits
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Solution Overview
Problem
Conventional workpiece rotating apparatuses face challenges in managing external forces acting on linear motors due to changes in workpiece posture, leading to potential motor overload and displacement issues, especially with long and heavy workpieces, which can result in inaccurate positioning and alarm generation.
Innovation Solution
Incorporating a linear motor and motor controller that adjust the position of the second rotary positioner based on detected external forces, ensuring the force magnitude remains below a predetermined threshold, and displacing the positioner to minimize bending-induced forces, thus preventing motor overload and maintaining accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the workpiece length is increased, then the handling capability is improved, but the bending amount increases and external force on the linear motor increases
Solution Approach 1:
The apparatus dynamically adjusts the distance between rotary positioners based on workpiece specifications and bending detection. The linear motor controller modifies the position of the second rotary positioner in real-time to compensate for bending, transforming a static positioning system into a dynamic one that adapts to varying workpiece conditions.
Solution Approach 2:
The system implements feedback control by detecting the bending amount of the workpiece and using this information to adjust the linear motor's position output. The bending detection unit provides continuous feedback about workpiece deformation, which the controller uses to calculate appropriate position adjustments, creating a closed-loop control system.
2Manufacturing precision
If the rigidity of the apparatus is increased to reduce bending, then the positioning accuracy is improved, but the apparatus size and complexity increase
Solution Approach 1:
The system replaces mechanical rigidity solutions with a control-based approach. Instead of increasing structural rigidity through heavier or more complex mechanical components, the invention uses bending detection and dynamic position adjustment via the linear motor controller to achieve accurate positioning, substituting mechanical complexity with intelligent control.
Solution Approach 2:
The system changes the operational parameters of the positioning system by dynamically adjusting the distance between rotary positioners based on detected bending. Rather than maintaining fixed rigid structures, the apparatus modifies positioning parameters in real-time to compensate for elastic deformation, achieving accuracy through parameter adaptation rather than structural rigidity.
3Force
If the linear motor is sized to handle maximum external force, then the force capacity is improved, but the apparatus size increases
Solution Approach 1:
The system applies partial action by adjusting the linear motor's output based on actual bending requirements rather than always operating at maximum capacity. The motor controller modulates the position adjustment to match the actual external force conditions, using only the necessary portion of the motor's capability, thereby allowing a smaller motor to suffice.
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
This solution effectively manages external forces on the linear motor, preventing overload and ensuring accurate positioning of the workpiece, even with varying workpiece lengths and types, allowing for downsized apparatus design without increased rigidity requirements.
Implementation Method 1
a linear motor (7) that linearly moves the second rotary positioner (6) in the direction along the rotation axis
Data Source
AI summary
A workpiece rotating apparatus including a first rotary positioner and a second rotary positioner which are arranged to face each other in a direction along a substantially horizontal rotation axis, which hold, respectively, one end portion and the other end portion of a long workpiece, and which can rotate the workpiece around the rotation axis, a linear motor which linearly moves the second rotary positioner in a direction along the rotation axis, and a motor controller which controls the linear motor to adjust a position of the second rotary positioner in a direction along the rotation axis, and the motor controller controls the linear motor so that magnitude of force acting on the linear motor from the other end portion of the workpiece via the second rotary positioner becomes equal to or smaller than a predetermined threshold.