Induction Coil Control Using Current Profiles to Prevent Overheating
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Solution Overview
Problem
Existing induction coil units require significant manual intervention to adjust operating parameters such as heating time for efficient induction shrink-fitting of tools into tool holders, leading to extended cycle times and potential errors, and if adjustments are not made correctly, the operation may be inefficient or result in overheating of the tool holder.
Innovation Solution
An induction coil unit and method for controlling an inductive heating process that automatically adjusts the heating parameters by analyzing the temporal or frequency profiles of coil current, coil voltage, input current, and input voltage, allowing for continuous or interrupted heating processes based on recognized temperature-dependent changes in magnetic and electrical properties of the tool holder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual adjustment of heating parameters is performed for each tool holder, then heating efficiency is improved, but cycle time increases and operational complexity increases
Solution Approach 1:
The system automatically determines temporal or frequency profiles of coil current and voltage during the heating process, and autonomously decides whether to continue or end heating based on analyzed profile changes. This self-service mechanism eliminates manual intervention while maintaining optimal heating efficiency, thereby reducing cycle time without sacrificing heating effectiveness.
Solution Approach 2:
The control unit continuously monitors the temporal or frequency profiles of coil current and voltage during heating, analyzes changes in these profiles, and uses this feedback information to automatically adjust the heating process. This closed-loop feedback system ensures optimal heating efficiency while preventing overheating, eliminating the need for manual parameter adjustments and reducing cycle time.
2Reliability
If manual adjustment of heating parameters is performed for each tool holder, then heating efficiency is improved, but device complexity increases
Solution Approach 1:
The system performs automatic recognition of tool holder parameters and self-adjusts heating parameters by analyzing temporal or frequency profiles of coil current and voltage. This automation of previously manual tasks reduces operational complexity while maintaining heating efficiency, as the system serves itself without requiring operator intervention.
Solution Approach 2:
The manual mechanical adjustment process is replaced by an automated control system that uses electrical measurements (temporal or frequency profiles of coil current and voltage) to determine heating parameters. This substitution of manual mechanical adjustment with automated electrical control reduces operational complexity while maintaining or improving heating efficiency.
3Reliability
If heating time is extended to ensure proper heating, then heating reliability is improved, but risk of overheating increases
Solution Approach 1:
The control unit continuously analyzes changes in temporal or frequency profiles of coil current and voltage during the heating process. When the profile indicates that the tool holder has reached the appropriate heating state, the system automatically ends the heating process. This real-time feedback control ensures reliable heating while preventing overheating, as the system responds dynamically to the actual heating state rather than using fixed time parameters.
Solution Approach 2:
The heating process is dynamically adjusted based on real-time analysis of temporal or frequency profiles. The system transitions from static, pre-determined heating times to dynamic, adaptive heating control that responds to actual heating conditions. This dynamic approach ensures adequate heating reliability while automatically preventing overheating by adjusting the heating duration to match the actual heating rate and thermal mass of the tool holder.
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
The solution enables increased automation, reduces cycle times, enhances operational safety, and prevents overheating of tool holders by automatically adjusting heating parameters based on real-time analysis of current and voltage profiles.
Implementation Method 1
thermally expand tool holders by way of alternating magnetic fields able to be generated by induction coils and the eddy currents thereby induced in the tool holders
Implementation Method 2
the eddy currents thereby induced in the tool holders
Implementation Method 3
thermally expand tool holders by way of alternating magnetic fields able to be generated by induction coils and the eddy currents thereby induced in the tool holders
Data Source
AI summary
An induction coil unit has an induction coil into which a sleeve portion of a tool holder is able to be inserted. The induction coil unit is used in an inductive heating process. To increase the degree of automation and operational safety in the induction coil unit, a temporal profile or a frequency profile of a coil current and/or of a coil voltage and/or of an input current and/or of an input voltage are or is determined for the sleeve portion inserted into the induction coil. The coil current profile and/or the coil voltage profile and/or the input current profile and/or the input voltage profile are or is then analyzed. Based on the analyzed profile or the evaluated profiles, namely based on a profile behavior and/or else a profile change and/or a profile change behavior, a decision is made as to whether the uninterrupted heating process is continued or ended.