Auxiliary Drive Generator for Drafting Frame Voltage Stability
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Solution Overview
Problem
Existing spinning preparation machines, such as draw frames, experience uncontrolled standstills and production losses due to voltage failures, which disrupt the operation and uniformity of fiber structures being processed.
Innovation Solution
Incorporating an additional drive that operates as a generator to maintain voltage for the drafting system rollers during power failures, allowing the machine to continue operating and ensuring fiber uniformity by using the generated tension to power the drafting drives and other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drafting machine is operated with a standard voltage source connected to the power grid, then the machine can operate at desired speed during normal conditions, but the machine will come to an uncontrolled standstill during voltage drops or interruptions
Solution Approach 1:
The auxiliary drive is designed to perform multiple functions: during normal operation it serves as a standard motor driving guideway components, and during voltage failure it automatically operates as a generator to produce voltage for the drafting drives. This multi-functionality eliminates the need for separate backup power systems while ensuring continuous operation.
Solution Approach 2:
The auxiliary drive utilizes the kinetic energy already present in the moving guideway components during voltage failure to generate electricity through generator operation. The system essentially powers itself by converting the motion of existing components into electrical energy, eliminating the need for external backup power sources.
2Reliability
If the auxiliary drive operates as a generator during voltage failure, then continuous operation is maintained, but the auxiliary drive must be slowed down to produce sufficient voltage
Solution Approach 1:
The auxiliary drive's operational characteristics are dynamically adjusted based on system needs. During normal operation it runs at optimal speed for guideway component drive, but during voltage failure it transitions to generator mode with adjusted speed to produce the required voltage level, allowing flexible adaptation to different operational conditions.
3Manufacturing precision
If the drafting rollers continue to operate during voltage failure, then fiber uniformity is maintained, but more energy is required to maintain the desired drafting speed
Solution Approach 1:
The system converts the harmful effect of voltage failure into a beneficial source of electrical energy. The auxiliary drive's generator operation during power grid failure provides the exact energy needed to maintain drafting roller operation, transforming the power crisis into a self-sustaining energy solution that maintains fiber uniformity without additional external energy input.
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
Enables continuous operation of the spinning preparation machine during voltage drops, maintaining fiber uniformity and preventing production losses by using the additional drive to generate sufficient voltage for the drafting system, even after the primary voltage source falls below a certain limit.
Implementation Method 1
This auxiliary drive operates as a generator and is thereby slowed down when the voltage of the power source supplying the guideway falls below a predetermined threshold
Data Source
Figure 1
AI summary
The invention relates to a method for operating a spinning preparation machine in the form of a frame (1), wherein the frame (1) comprises a drafting unit (2) with several roller combinations arranged in series, which are driven by one or more drafting drives (6) to homogenize a fiber web (7) passing through the drafting unit (2) during its operation, and wherein the frame (1) includes at least one auxiliary drive (8) which serves to drive one or more further movable components of the frame (1). According to the invention, it is proposed that the auxiliary drive (8) is operated as a generator and thereby braked when the voltage of the voltage source (12) supplying the frame (1) with electrical energy falls below a predetermined limit, wherein the voltage generated by the auxiliary drive (8) during the braking process due to its generator operation is used to drive the [other] movable components of the frame (1).The delay drives (6) are used to homogenize the fiber assembly (7) supplied to the drafting unit (2) even after the tension has been released. Furthermore, a spinning preparation machine is proposed which includes a control system by means of which the spinning preparation machine can be operated according to the method of the invention.