Spinning Unit Drafting Motor Resonance Control
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Solution Overview
Problem
Existing drafting devices face challenges in stably drafting fiber bundles while maintaining a consistent drafting condition, leading to uneven yarn quality and increased periodic unevenness due to resonance issues with stepping motors.
Innovation Solution
The implementation of a control system that adjusts the operation of stepping motors by varying the electric current applied to the driver rollers, ensuring the drafting process meets the set conditions by avoiding resonance frequencies and maintaining torque requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the stepping motor operates at high speed to increase productivity, then the drafting speed improves, but resonance occurs causing periodic unevenness in yarn quality
Solution Approach 1:
The patent applies dynamics by making the motor operating parameters adjustable and variable. The control section dynamically changes the pulse signal frequency and electric current magnitude based on the drafted fiber bundle properties, allowing the system to adapt to different operating conditions and avoid resonance while maintaining high speed drafting.
Solution Approach 2:
The patent changes motor operating parameters (pulse signal frequency and electric current magnitude) to resolve the contradiction. By adjusting these parameters according to the fiber bundle characteristics, the system avoids resonance frequencies that cause periodic unevenness while maintaining high drafting speed for improved productivity.
2Reliability
If the electric current magnitude is increased to maintain torque at high speeds, then the drafting stability improves, but power consumption increases
Solution Approach 1:
The control section dynamically adjusts the electric current magnitude based on the drafted fiber bundle properties and operating conditions. This dynamic adjustment allows the motor to maintain sufficient torque for stable drafting only when necessary, rather than continuously operating at high current levels, thereby reducing overall power consumption while preserving drafting stability.
Solution Approach 2:
The patent optimizes the electric current magnitude parameter by changing it according to the fiber bundle characteristics and drafting requirements. This parameter optimization ensures adequate torque for stable drafting while minimizing excessive current that would increase power consumption, achieving a balance between reliability and energy efficiency.
3Manufacturing precision
If the pulse signal frequency is adjusted to avoid resonance, then periodic unevenness is reduced, but the drafting speed may be compromised
Solution Approach 1:
The control section dynamically adjusts the pulse signal frequency based on the drafted fiber bundle properties. This dynamic frequency adjustment allows the system to avoid resonance frequencies that cause periodic unevenness while maintaining optimal drafting speed, resolving the contradiction between yarn uniformity and productivity through real-time parameter optimization.
Solution Approach 2:
The patent changes the pulse signal frequency parameter according to the fiber bundle characteristics and operating conditions. By optimizing this parameter, the system avoids resonance frequencies that degrade yarn uniformity while maintaining high drafting speeds for improved productivity, achieving both precision and efficiency.
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 stabilizes the drafting process, reduces yarn thickness unevenness, and prevents periodic unevenness, resulting in improved yarn quality and reduced power consumption.
Implementation Method 1
a stepping motor that rotationally drives the driver roller of at least one roller pair among the roller pairs
Implementation Method 2
a plurality of roller pairs that drafts a fiber bundle, each roller pair including a driver roller and a driven roller that rotates following the rotation of the driver roller
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A drafting device (6) includes a back roller pair (14), a third roller pair (15), a middle roller pair (16), and a front roller pair (17) that draft a fiber bundle (F). The drafting device (6) also includes a stepping motor that rotationally drives a back bottom roller (14a) of the back roller pair (14), a main control device (5a) that receives setting of a drafting condition about the fiber bundle (F), and a unit control device (10) that controls an operation of the stepping motor. The unit control device (10) adjusts the operation of the stepping motor such that the drafting performed by the roller pairs (14, 15, 16, 17) is within a range that satisfies the drafting condition received by the main control device (5a).