Magnetic Field Robotic Arm Positioning Accuracy Measurement
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Solution Overview
Problem
Current positioning correction technologies for robotic arms, such as laser interferometers, laser trackers, and image sensors, face challenges including limited axis measurement, high hardware and software costs, lengthy measurement times, and the generation of pollution like oil stains during use.
Innovation Solution
A measurement system utilizing a first magnetic element on the robotic arm and a second magnetic element on a fixed platform, connected to a computing device and controlling device, which generates a magnetic field to quickly and accurately measure three-axis movement errors in a three-dimensional space without causing pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser interferometers are used for positioning correction, then measurement precision is improved, but measurement time increases and productivity decreases
Solution Approach 1:
The patent replaces optical measurement systems (laser interferometers) with a magnetic field-based measurement system. Magnetic probes and Hall sensors detect magnetic field changes to determine robotic arm position, eliminating the need for complex optical paths and interferometry while achieving comparable positioning accuracy with faster measurement cycles
Solution Approach 2:
The patent changes the measurement parameter from optical path length (laser interferometry) to magnetic field strength and distribution. By measuring magnetic field parameters at different positions using Hall sensors, the system determines robotic arm location through magnetic field characteristic analysis, achieving rapid and accurate positioning measurement
2Measurement precision
If laser trackers are used for positioning correction, then measurement precision and productivity are improved, but device complexity and hardware cost increase
Solution Approach 1:
The patent replaces expensive laser tracking hardware with a magnetic field measurement system consisting of magnetic probes and Hall sensors. This substitution maintains measurement precision while dramatically reducing hardware complexity and cost by using electromagnetic field interactions instead of sophisticated optical tracking equipment
Solution Approach 2:
The patent uses relatively simple and inexpensive magnetic field sensors (Hall sensors) instead of costly laser trackers. The magnetic measurement system provides a cost-effective alternative that achieves comparable positioning accuracy without requiring expensive optical equipment and complex calibration systems
3Productivity
If image sensors are used for positioning correction, then productivity is improved by enabling measurement during operation, but manufacturing precision deteriorates due to oil stain generation
Solution Approach 1:
The patent replaces image-based optical measurement with magnetic field measurement. Magnetic probes and Hall sensors detect magnetic field changes caused by the robotic arm's movement, enabling contactless, real-time positioning measurement during operation without the lubrication and optical interference problems associated with mechanical and optical systems
Solution Approach 2:
The patent changes from optical parameter measurement (image sensors capturing visual information) to magnetic field parameter measurement. By detecting changes in magnetic field strength and distribution as the robotic arm moves through different positions, the system achieves accurate positioning measurement during operation without generating oil stains or requiring complex image processing
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
Enables rapid and accurate positioning accuracy measurement of robotic arms in three-dimensional space, providing compensation information without generating pollution, thus improving operational efficiency and reducing maintenance needs.
Implementation Method 1
The robotic arm is controlled to move the first magnetic element above the second magnetic element to generate a magnetic field
Implementation Method 2
the first magnetic element is a magnetic probe, and the second magnetic element is an array Hall sensor
Data Source
AI summary
A measurement system for positioning accuracy of a robotic arm includes the robotic arm, a computing device, a robotic arm controlling device, a first magnetic element and a second magnetic element. The robotic arm controlling device is electrically connected to the robotic arm and the computing device. The first magnetic element is disposed on a robotic arm. The second magnetic element is disposed on a fixed platform. One of the first magnetic element and the second magnetic element is electrically connected to the computing device. The robotic arm controlling device controls the robotic arm to move the first magnetic element above the second magnetic element to generate a magnetic field. The computing device is configured to calculate a plurality of movement error information of the first magnetic element in the magnetic field, and count the plurality of movement error information to obtain a positioning accuracy of the robot arm.