Drivetrain Rigidity Determination via Position Difference Analysis
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Solution Overview
Problem
Existing methods for determining the rigidity of a drivetrain in machine tools and production machines are costly and require precise, high-cost measurement equipment, making it difficult to detect discrepancies in mechatronic characteristics and maintain consistent machine performance over time.
Innovation Solution
A method using a numerical controller to determine drivetrain rigidity by pre-specifying constant acceleration, measuring position differences between motor and length-measuring systems, and calculating rigidity values, which are stored and used to create a characteristic curve, with compensation for friction and inertia to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If highly precise measurement equipment is used to determine mechatronic characteristics, then measurement accuracy is improved, but measurement cost increases
Solution Approach 1:
The patent creates a virtual model (copy) of the physical drivetrain system through dynamic modeling. Instead of using expensive physical measurement equipment, the system creates a mathematical representation that replicates the behavior of the actual system, allowing rigidity determination through computational analysis rather than physical measurement.
Solution Approach 2:
The patent replaces physical measurement equipment with a computational approach. The dynamic model and frequency analysis substitute for traditional mechanical measurement devices, transforming a physical measurement problem into a computational one that can be solved using existing control system resources.
2Measurement precision
If complex measurement equipment is deployed to detect drivetrain rigidity, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent makes existing control system components serve multiple functions. The numerical controller, already present for motion control, is also used for dynamic modeling and rigidity determination. The motor-measuring system and length-measuring system serve both their primary positioning functions and the secondary function of providing data for rigidity analysis.
Solution Approach 2:
The system uses its own existing resources to perform the measurement function. The control system's built-in capabilities for motion control and position measurement are leveraged to automatically determine drivetrain rigidity without requiring external specialized equipment.
3Measurement precision
If dynamic modeling and frequency analysis are performed to determine drivetrain rigidity, then rigidity determination accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent performs dynamic modeling and identifies system parameters in advance, before actual operation or maintenance decisions are needed. By pre-establishing the dynamic model and determining rigidity characteristics proactively, the system enables early detection of discrepancies without requiring complex real-time analysis during critical operations.
Solution Approach 2:
The system uses feedback from position measurements and motor data to continuously refine the dynamic model and rigidity determination. The numerical controller compares measured positions with modeled positions, using the difference information to accurately determine drivetrain rigidity through iterative analysis.
Data Source
AI summary
A drivetrain for linear movement of a machine component along a linear guide of a machine includes a motor with a motor-measuring system. A length-measuring system is assigned to the linear guide for determining a position of the machine component. To determine rigidity of the drivetrain, a constant acceleration for the machine component is predetermined by a numerical controller for performing closed-loop control of the movement of the machine component. The numerical controller determines a difference between a position of the machine component derived from the motor-measuring system and a position of the machine component measured at the same time by the length-measuring system during the acceleration phase, and the difference is assigned to the acceleration or to a force required for the acceleration and storage in the numerical controller of the pair of values established in this way and/or of a rigidity value emanating from the pair of values.