Spinning Rotor Speed Control via Acceleration Time Analysis
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Solution Overview
Problem
Open-end rotor spinning devices with single-motor drives face challenges in ensuring operational reliability and preventing damage from incorrect rotor speeds, particularly due to varying rotor diameters affecting centrifugal forces and yarn parameters.
Innovation Solution
A method where the spinning rotor is accelerated from a first speed to a second speed, with the acceleration time recorded and evaluated as an evaluation variable to identify the rotor diameter, limiting the permissible speed to prevent damage, and displaying warnings if deviations occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large spinning rotor is used to spin thicker yarn, then the yarn fineness range is improved, but the permissible rotational speed decreases due to higher centrifugal forces
Solution Approach 1:
The system performs preliminary identification of the spinning rotor's diameter and shape characteristics before operation begins. The control system stores reference values for different rotor types and pre-determines the permissible rotational speed limits based on the identified rotor characteristics, preventing damage from excessive speed before it occurs.
Solution Approach 2:
The invention changes the operational parameters (permissible rotational speed) based on the identified rotor characteristics (diameter, shape). The control system adjusts the speed limits dynamically according to the specific rotor type installed, allowing optimal operation for each rotor configuration while preventing damage from inappropriate speed settings.
2Reliability
If rotational speed is monitored to detect malfunctions, then operational reliability is improved, but the detection precision is insufficient because speed deviations are significantly smaller than energy input deviations
Solution Approach 1:
The invention replaces mechanical speed monitoring with an electrical measurement approach. By monitoring the electrical energy input to the motor driving the spinning rotor, the system detects malfunctions with much higher precision, as electrical deviations are significantly larger and more easily measurable than mechanical speed deviations.
Solution Approach 2:
The invention introduces an intermediary measurement approach by monitoring the electrical energy consumption as an indirect indicator of rotor condition. Instead of directly measuring rotor speed or mechanical parameters, the system uses electrical energy input as a mediator to detect bearing contamination and other malfunctions with superior precision.
3Reliability
If identification marks are automatically detected to configure spinning stations, then quality assurance is improved, but additional hardware and system complexity are required
Solution Approach 1:
The invention replaces mechanical or optical identification mark detection systems with an electrical measurement-based identification method. By measuring the acceleration characteristics and electrical energy consumption of the rotor, the system automatically identifies rotor type and configures spinning parameters without requiring additional sensors, markers, or complex detection hardware.
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
This method enhances operational safety by ensuring the spinning rotor operates within safe speed limits, preventing damage and ensuring compatibility with set yarn and spinning parameters, without requiring additional hardware beyond existing control devices and software adaptations.
Implementation Method 1
The invention is based on the understanding that acceleration depends on the diameter of the spinning rotor. A smaller spinning rotor accelerates faster than a larger one due to its lower moment of inertia.
Implementation Method 2
a single-motor drive (3) for driving the spinning rotor (2)
Data Source
Figure 1
Figure 2~3
AI summary
The present invention relates to a method for operating an open-end rotor spinning device (1) with an interchangeable, individually motor-driven spinning rotor (2). According to the invention, the spinning rotor (2) is accelerated from a first speed (n1) to a second speed (n2), and the acceleration time (tA, tB) required for the acceleration from the first speed (n1) to the second speed (n2) is recorded and evaluated as a parameter. Alternatively, the spinning rotor (2) is accelerated from a first speed (n1) for a predetermined acceleration time (tA, tB), and the second speed (n2) reached during this time is recorded and evaluated as a parameter. The invention further relates to the open-end rotor spinning device (1).