Electromagnetic Yarn Loop Compensator for High-Speed Textile Machines

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Solution Overview

Problem

Existing yarn loop compensators face limitations in dynamics and controllability, especially at high yarn production speeds, making it difficult to maintain stable yarn tension and manage yarn loop formation during spinning and bobbin handling operations.

Innovation Solution

An electromagnetic active compensator with a position sensor comprising at least two spaced sensing elements coupled to a control device, which evaluates the current position, direction, speed, and acceleration of the compensating arm, allowing for precise control of the compensating arm's motion and force through the electric control coil, enabling dynamic control of yarn tension and loop compensation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If spring compensators or magnetic compensators with permanent magnets are used, then the construction remains simple and setting is easy, but the dynamics of the compensating arm are limited and cannot meet technological requirements at high yarn production speeds

Engineering Contradiction:

Improveyarn production speedVSAvoiddynamics of compensating arm

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces the mechanical spring compensator system with an electromagnetic compensator that uses an electric control coil and power source to actuate the compensating arm. This substitution enables dynamic control through electrical signals, allowing the system to respond to high-speed yarn production requirements while maintaining simplicity in construction and ease of setting.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a dynamic control system where the position sensor continuously monitors the compensating arm position and feeds back to the control device, which adjusts the electric current in real-time. This closed-loop control enables the compensating arm to dynamically adapt to varying yarn production speeds and maintain proper tension throughout the winding process.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If a position sensor with only one sensing element is used, then the device complexity is reduced, but the controllability during transient states and extreme positions is limited

Engineering Contradiction:

Improvecontrollability during transient statesVSAvoidposition sensor structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides the position sensing function into multiple discrete sensing elements spaced at different positions along the compensating arm. Each sensing element provides independent position information, enabling the control device to accurately determine the arm's position, direction, speed, and acceleration. This segmentation allows precise control during transient states and extreme positions while keeping each individual sensor element simple.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a feedback control system where multiple position sensor elements continuously provide position information to the control device. The control device processes this feedback to determine the compensating arm's motion parameters and adjusts the electric current accordingly, enabling precise controllability during transient states, extreme positions, and normal operation.

Inventive Principle:

Principle #23Feedback

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 solution enhances the controllability and maneuverability of the compensating arm, allowing for accurate regulation of yarn tension and loop compensation at high speeds, even during transient states and extreme positions, ensuring stable yarn winding and handling.

Implementation Method 1

an electromagnetic device with a cylindrical magnet rotatably disposed about its longitudinal axis between the magnet pole extensions with which a control coil is associated

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Data Source

PatentEP3409625B1Electromagnetic active compensator of a yarn loop at a workstation of a textile machine and methods of controlling it

Publication Date: 2023.09.27 RIETER CZ AS

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Figure 3a~3b

AI summary

The invention relates to a method of controlling an electromagnetic active compensator, in which is controlled the motion of the compensating arm, whose one end acts on the yarn in the section between a draw-off mechanism of yarn and a yarn winding device and maintains stable tension in the yarn, whereby the position of the compensating arm (1) is sensed and a signal (P1) about the position of this compensating arm (1) is carried to a control device for the compensation of a yarn (21) loop, which according to it controls the operation of the compensator, the course of the motion of the compensating arm (1) and the size of the force (F) of the compensating arm (1). An electromagnetic active yarn loop compensator at a workstation of a textile machine compprising a compensating arm mounted on a cylindrical magnet or a shaft with a magnet, which is mounted rotatably about its longitudinal axis between the pole extensions of the magnet, which is associated with an electric control coil connected to a source of electric current and to a control device, whereby the compensator comprises a position sensor (2) of the compensating arm (1). The position sensor (2) of the compensating arm (1) comprises at least two mutually spaced sensing elements, which are coupled to a control device (13).