Synchronous Motor Yarn Guide Control for Inertial Force Reduction
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Solution Overview
Problem
Existing yarn distribution systems in textile machines face limitations due to high inertial forces, especially in high-speed machines, leading to reduced working speed and increased unproductive setup times, and complex control processes for maintaining precise yarn package formation.
Innovation Solution
A method and device utilizing a high-speed disk two-phase synchronous motor with a contactless magnetic sensing system to precisely control the yarn guide's position and motion, minimizing inertial forces by maintaining constant rotational speed and adjusting the path length based on real-time position feedback, ensuring accurate synchronization and reduced setup times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a long distribution rod carrying multiple yarn guides is used for communal drive, then the structure can support multiple operating units, but large inertial forces limit the frequency of cyclic motion
Solution Approach 1:
The patent divides the communal drive system into individual drive units, with each operating unit having its own synchronous motor and belt gear. This segmentation eliminates the long distribution rod and reduces the inertial mass of each reciprocating component, allowing higher operating frequencies while maintaining the ability to serve multiple operating units through independent control
2Measurement precision
If continuous monitoring and assessment of position difference is implemented, then control precision is improved, but device complexity and operational complexity increase
Solution Approach 1:
The patent replaces complex continuous mechanical position monitoring with a simpler electronic sensor system. Optical or magnetic sensors detect the position of marking means on the yarn guide, and electronic evaluation circuitry processes this information to generate correction signals, reducing mechanical complexity while maintaining high measurement precision
Solution Approach 2:
The patent implements a feedback control system where the detected position of the yarn guide is continuously compared with the desired position, and correction signals are automatically generated to eliminate deviations. This closed-loop feedback maintains precision without requiring overly complex manual monitoring and adjustment mechanisms
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 approach significantly enhances yarn distribution speed, improves package quality, and extends the service life of the device by simplifying operation and reducing inertial forces, allowing for more precise control and efficient yarn winding.
Implementation Method 1
The marking means is composed of at least one magnet and the sensing device comprises at least one contactless magnetic sensor
Data Source
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AI summary
The invention relates to a method and a device for distributing yarn wound on a cross-wound bobbin (2) at an operating unit of a textile machine, in which a yarn guide (3) actuated by a synchronous motor (43) reciprocates along the axis of the rotation of the wound bobbin (2), whereby on the synchronous motor (43) a time interval for the reciprocating travel of the yarn guide (3) from one dead centre (U1) to the other dead centre (U2) is set and the position of the yarn guide (3) is synchronized with the the reference position which is between these dead centres (U1, U2). During each reciprocating travel, the time point of the actual passing of the yarn guide (3) through the reference position is detected and the time difference between the time point of the actual passing of the yarn guide (3) through the reference position and the predetermined theoretical time point of the passing of the yarn guide (3) through the reference position is evaluated and, on the basis of the detected time difference, the duration of the rotation of the synchronous motor (43) changes until the respective reciprocating travel is finished, which also leads to the change of the length of the path of the yarn guide (3) from the reference position to the dead centre (U1, U2), to which the yarn guide (3) is currently approaching.