Rigid-Flexible Ball Screw Platform for Friction Dead Zone Compensation
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Solution Overview
Problem
Existing ball screw-driven platforms face challenges in achieving high precision due to friction dead zones and vibration issues at high speeds, limiting their overall speed and accuracy.
Innovation Solution
A rigid-flexible coupling motion platform driven by a ball screw, combined with a servo motor and displacement sensor, utilizes dual-feedback control modes, including auto disturbance rejection, to compensate for friction dead zones and improve dynamic performance, achieving high precision through elastic deformation and full-closed loop feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ball screw is used to drive the platform, then the friction dead zone problem is addressed, but positioning precision is degraded due to friction dead zones
Solution Approach 1:
The patent implements a dual-feedback control system using a displacement sensor to provide position feedback and a servo motor to provide speed feedback. This closed-loop feedback mechanism compensates for the friction dead zone effects of the ball screw, allowing the system to maintain high positioning precision despite the inherent friction characteristics of ball screw mechanics.
Solution Approach 2:
The patent employs auto disturbance rejection control that dynamically adjusts control parameters based on real-time system state. By changing control parameters adaptively, the system compensates for friction dead zones and maintains positioning precision across different operating conditions.
2Manufacturing precision
If a linear motor is used to drive the rigid-flexible coupling motion platform, then the friction dead zone problem is solved, but vibration occurs at high speeds due to low frequency of the flexible hinge
Solution Approach 1:
The patent replaces the linear motor with a ball screw-driven system. This substitution changes the mechanical drive mechanism, utilizing the ball screw's inherent ability to maintain stability at high speeds while the rigid-flexible coupling structure compensates for friction effects through elastic deformation.
Solution Approach 2:
The patent uses a rigid-flexible coupling structure where the flexible hinge provides dynamic compliance. The flexibility allows the system to absorb vibrations and maintain stability during high-speed operation, while the rigidity ensures precise motion transmission when needed.
3Stability of the object's composition
If a rigid platform is used, then structural stability is maintained, but positioning precision is degraded due to friction dead zones
Solution Approach 1:
The patent creates a composite structure combining rigid and flexible elements. The rigid components provide structural stability, while the flexible hinge components enable precision compensation through elastic deformation, effectively merging the advantages of both rigid and flexible systems.
Solution Approach 2:
The patent applies different mechanical properties to different parts of the system. The guide rail and main structure maintain rigidity for stability, while the flexible hinge introduces localized flexibility for precision compensation, allowing each component to optimize its function.
4Manufacturing precision
If dual-feedback control with auto disturbance rejection is implemented, then positioning precision is improved, but system complexity increases
Solution Approach 1:
The patent implements dual-feedback control with position feedback from a displacement sensor and speed feedback from a servo motor encoder. This feedback architecture enables precise control while using standard, readily available components to manage system complexity.
Solution Approach 2:
The auto disturbance rejection control enables the system to automatically compensate for disturbances and friction effects without external intervention. The controller self-adjusts based on real-time feedback, reducing the need for manual calibration and simplifying operation despite the advanced control algorithms.
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 solution enhances positioning precision, adapts to different working conditions, and maintains high accuracy in micron, sub-micron, and nanoscale precision without increasing costs, by using flexible hinges and advanced control algorithms to estimate and compensate for disturbances.
Implementation Method 1
a ball screw, a guide rail sliding block, a displacement sensor and a driving controller; the servo motor is configured to drive the ball screw; the workbench is connected with the ball screw
Implementation Method 2
combines the elastic deformation of the rigid-flexible coupling motion platform to compensate for the problem of a friction dead zone
Implementation Method 3
the displacement sensor is configured to feed back the position of the workbench
Data Source
AI summary
A rigid-flexible coupling motion platform driven by a ball screw includes a base, a linear guide rail fixed to the base, a rigid-flexible coupling platform, a servo motor, a ball screw, a guide rail sliding block, a displacement sensor and a driving controller. The rigid-flexible coupling platform includes a frame and a workbench. The frame and the workbench are connected through a flexible hinge; the servo motor is configured to drive the ball screw; the workbench is connected with the ball screw; the frame is connected with the linear guide rail by the guide rail sliding block; the displacement sensor is configured to feed back the position of the workbench; and the driving controller controls the ball screw to drive the workbench to move according to different control modes. The advantages of the ball screw drive and the rigid-flexible coupling motion platform are fully combined, and the positioning precision of the platform is greatly improved.