Godet Casing Temperature Measurement via Electrical Impedance
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Solution Overview
Problem
Existing methods for determining the temperature of an inductively heatable godet casing in textile machines are not precise enough, often requiring structural modifications that weaken the godet casing and are costly, due to the use of temperature sensors, and struggle to isolate the electrical resistance of the godet jacket.
Innovation Solution
A method that measures the impedance of the overall electrical system, including the godet casing, induction coil, and power supply, by applying direct and alternating current signals to determine the temperature of the godet casing without the need for direct temperature sensors, using the resistance and impedance values to calculate the temperature accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor system is connected directly to the godet sleeve and rotates with it, then the temperature can be detected, but an additional rotary transmission system is required which increases device complexity
Solution Approach 1:
The patent replaces the mechanical temperature sensor system with an electrical impedance measurement system. Instead of using physical temperature sensors that require rotary transmissions, the invention measures the impedance of the godet casing itself, which changes with temperature, thereby eliminating the need for mechanical sensor systems and rotary transmissions.
Solution Approach 2:
The godet casing serves dual purposes: it is both the heated component and the measurement element. The casing's electrical impedance inherently reflects its temperature, eliminating the need for separate temperature sensing components. The system uses the godet casing's own electrical properties for self-diagnosis of temperature.
2Measurement precision
If a groove is worked into the godet casing for the temperature sensor, then the temperature can be detected, but the structural strength of the godet casing is weakened
Solution Approach 1:
The patent eliminates the need for physical grooves and embedded sensors by using electrical impedance measurement through the existing godet casing structure. The measurement system applies electrical signals to the casing and analyzes the impedance changes, requiring no structural modifications that would weaken the casing.
Solution Approach 2:
Instead of physically embedding sensors in the godet casing, the invention creates an electrical model of the casing's impedance characteristics. By measuring the electrical impedance through the casing's existing structure, the system obtains temperature information without physical intrusion or structural modification.
3Strength
If the temperature sensor system is arranged outside of the godet casing, then the godet casing structure is not weakened, but heat shielding and wind deflectors are required which increase device complexity
Solution Approach 1:
The patent replaces external mechanical temperature sensing systems with an electrical impedance measurement system. By measuring the electrical properties of the godet casing directly, the invention eliminates the need for external heat shielding and wind deflectors that would be required for conventional contactless temperature sensors.
Solution Approach 2:
The electrical impedance serves as an intermediary parameter that directly reflects the temperature of the godet casing without requiring physical contact or external shielding. The impedance measurement acts as a mediator between the heating system and temperature control, providing temperature information through electrical properties rather than thermal or mechanical interaction.
4Measurement precision
If temperature sensors are used to detect the godet jacket temperature, then precise temperature control can be achieved, but the material cost and device complexity increase
Solution Approach 1:
The godet casing's electrical impedance inherently provides temperature information, eliminating the need for separate temperature sensing materials. The system uses the casing's own electrical properties for temperature measurement, reducing material costs while maintaining measurement precision.
Solution Approach 2:
The godet casing serves multiple functions: it is the heated component, the structural element, and the temperature sensing element. By utilizing the casing's electrical impedance for temperature measurement, the invention combines heating and sensing functions into a single component, reducing the need for additional expensive temperature sensing materials.
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 provides precise temperature control of the godet casing without structural weakening and eliminates the need for costly temperature sensors, ensuring accurate temperature measurement and efficient operation of textile machines.
Implementation Method 1
a godet with a godet jacket T jacket which can be heated with the aid of eddy currents induced in the godet jacket
Implementation Method 2
the eddy currents being generated by at least one induction coil with an induction power supply
Implementation Method 3
it is generally known that electrical conductors have a higher electrical resistance with increasing temperature
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Method for determining the temperature of a galette jacket T of a galette of a textile machine, wherein the galette jacket can be heated by means of eddy currents induced in the galette jacket, wherein the eddy currents are generated by at least one induction coil (3,6) with an induction power supply (25), wherein the induction coil (3,6), induction power supply (25) and galette jacket (5) form an overall electrical system.