Linear Feedback Positioning Module Magnetic Scale Error Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional linear positioning modules in machines like laser drilling and milling suffer from accumulated errors due to gear misalignment and back clearance, leading to reduced production efficiency and product accuracy, requiring frequent shutdowns for error correction.
Innovation Solution
A linear feedback positioning module with a magnetic scale and read head system that provides real-time position feedback to the drive assembly, allowing for continuous error correction without machine shutdowns, enhancing positioning accuracy and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional linear positioning module with lead screw and gears is used, then the structure is simple and easy to manufacture, but accumulated errors occur due to gear misalignment and back clearance
Solution Approach 1:
The patent replaces the mechanical feedback mechanism (gears, lead screw) with a magnetic field-based feedback system. The magnetic scale attached to the moving assembly and read head on the stationary assembly create a non-contact measurement system that eliminates mechanical back clearance and wear, directly resolving the positioning accuracy issue while maintaining system simplicity
Solution Approach 2:
The patent implements a feedback mechanism where the read head continuously reads position information from the magnetic scale and sends correction signals to the drive assembly. This closed-loop feedback system automatically compensates for positioning errors without requiring complex mechanical adjustments or shutdowns for recalibration
2Manufacturing precision
If frequent laser measurement checking is performed to correct errors, then positioning accuracy can be maintained, but production efficiency is greatly reduced due to machine shutdown
Solution Approach 1:
The magnetic feedback system operates continuously during machine operation, providing real-time position monitoring and error correction without interrupting the production process. The read head continuously reads the magnetic scale position, and the controller continuously adjusts the drive assembly, maintaining positioning accuracy throughout operation without shutdowns
Solution Approach 2:
The system performs self-correction of positioning errors through the feedback loop. When the read head detects position deviations from the magnetic scale, the controller automatically generates correction signals to the drive assembly, enabling the system to self-correct without external intervention or shutdowns for recalibration
3Length of moving object
If lead screw is made longer to increase travel range, then the positioning range is improved, but distortion and eccentricity cause larger accumulated errors
Solution Approach 1:
The patent replaces the long lead screw mechanical transmission system with a magnetic scale system for position measurement. The magnetic scale can be made arbitrarily long without the same distortion and eccentricity problems as mechanical lead screws, as it relies on magnetic field patterns rather than mechanical precision over long distances
Solution Approach 2:
The magnetic scale acts as an intermediary between the moving assembly and the measurement system. Instead of directly measuring the position of the lead screw or moving assembly through mechanical means, the magnetic scale provides a magnetic field reference that the read head can continuously track, eliminating the need for extremely precise mechanical manufacturing over long distances
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 module improves product accuracy and production efficiency by enabling continuous error correction, reducing the need for frequent shutdowns and ensuring higher product competitiveness.
Implementation Method 1
The feedback assembly includes a magnetic scale cooperating with a read head, and the magnetic scale is combined on the platform of the leading assembly and located along the lead screw
Data Source
AI summary
A linear feedback positioning module is provided with a coupling and a drive at one side of a platform having a lead screw, a movable assembly combined on the lead screw and a feedback assembly. The feedback assembly includes a magnetic scale cooperating with a read head. The magnetic scale is combined on the platform and located along the lead screw to cooperate with the lead screw. The linear feedback positioning module is further used with a backend control assembly. By such arrangements, the feedback assembly can correct error at any moment to improve the process and product accuracy and increase the production efficiency and product competitiveness.