Machine Component Life Expectancy Prediction via Drive Unit Torque
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Solution Overview
Problem
Existing methods for determining the life expectancy of machine components, such as ball screw drives, rely on theoretical load cycles, failing to account for real stresses, which can lead to premature deterioration and inaccurate replacement timing.
Innovation Solution
A method and device that use sensor units to measure real loads on machine components during operation, calculating life expectancy based on characteristic data and values, providing a remaining life expectancy estimate for optimized maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If theoretical load cycles are used to determine life expectancy, then calculations are simple and can be performed during machine construction, but the life expectancy prediction is inaccurate because real stresses are not taken into account
Solution Approach 1:
The patent replaces direct mechanical stress measurement on the machine component with indirect measurement through the drive unit. Instead of installing sensors on the ball screw drive itself, the system uses sensors on the motor to measure torque and speed, which are then converted to equivalent load values. This substitution maintains measurement accuracy while significantly reducing system complexity
Solution Approach 2:
The patent introduces the drive unit as an intermediary between the machine component and the measurement system. The drive unit serves as a mediator that translates motor parameters (torque, speed) into meaningful load characteristics for the machine component. This intermediary approach enables accurate life expectancy prediction without requiring direct access to the component's internal stresses
2Reliability
If sensor units are installed to measure real loads, then life expectancy prediction accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the drive unit multi-functional by having it perform both its primary function of driving the machine component and the secondary function of measuring and processing load data for life expectancy determination. The drive unit's existing sensors and processor are utilized for dual purposes, eliminating the need for separate measurement systems and reducing overall device complexity
Solution Approach 2:
The drive unit serves itself by using its own built-in sensors and processing capabilities to generate life expectancy predictions. The system leverages the drive unit's existing infrastructure (torque sensors, speed sensors, processor) to perform measurements and calculations that would otherwise require additional dedicated components, thereby reducing system complexity
3Ease of operation
If theoretical life expectancy calculations are performed, then maintenance scheduling is simple, but component replacement may occur prematurely or at inappropriate times due to unaccounted stresses
Solution Approach 1:
The patent implements a feedback mechanism where real-time load measurements from the drive unit continuously inform life expectancy calculations. The system monitors actual operating conditions (torque, speed, load patterns) and uses this feedback to dynamically update maintenance predictions. This closed-loop approach maintains operational simplicity while dramatically improving maintenance timing accuracy by adapting to actual component stresses
Data Source
AI summary
In a method for determining the life expectancy of machine components (2) during operation, characteristic data are established in order to determine the life expectancy for the relevant machine component (2), loads acting on the machine part (2) during operation are determined by means of a sensor device (10), characteristic values that are characteristic for the loads acting on the machine component (2) are determined, and the life expectancy is determined based on the characteristic values and on the characteristic data for the machine component (2).