Induction Hardening Control System for Effective Power Monitoring
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Solution Overview
Problem
Conventional induction hardening systems face challenges in accurately monitoring effective power and detecting load fluctuations due to low power factor and sensitivity issues, leading to inconsistent hardening quality, especially when the positional relation between the work and heating coil deviates from predetermined settings.
Innovation Solution
An induction hardening control system that includes a hardening control unit, a hardening monitoring unit, and a data collecting unit, which measures and monitors electric quantities in the high-frequency inverter, capacitor, and heating coil circuit, collecting data from sensors to ensure the induction hardening process adheres to setup conditions, thereby improving sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If effective power is monitored by measuring phase difference between coil voltage and coil current, then power monitoring capability is provided, but measurement precision deteriorates due to low power factor and high phase difference
Solution Approach 1:
The patent introduces an intermediary measurement approach by measuring the voltage across the matching capacitor instead of directly measuring phase difference between coil voltage and current. This intermediary measurement point provides a more stable reference that is less sensitive to temperature drift and frequency fluctuations, thereby improving effective power monitoring accuracy without requiring complex compensation circuits.
Solution Approach 2:
The patent replaces the conventional electrical phase difference measurement method with an alternative electrical measurement approach. Instead of using arithmetic circuits to calculate effective power from voltage and current phase difference (which is sensitive to environmental factors), the system measures capacitor voltage and uses it as a reference, substituting the problematic measurement mechanism with a more stable one.
2Device complexity
If conventional monitoring methods are used with low power factor loads, then system simplicity is maintained, but measurement precision deteriorates due to high phase difference
Solution Approach 1:
The patent changes the measurement parameter from direct coil voltage and current phase difference to capacitor voltage. By measuring the voltage across the matching capacitor, which has a different phase relationship with the current, the system obtains a measurement that is less affected by the high phase difference characteristic of low power factor loads, thereby improving accuracy while maintaining system simplicity.
3Adaptability or versatility
If positional relation between work and heating coil deviates from predetermined settings, then adaptability to varying conditions is improved, but manufacturing precision deteriorates due to inconsistent hardening quality
Solution Approach 1:
The patent implements feedback control by continuously monitoring the effective power and comparing it with the target value. When the positional relation between work and heating coil deviates, causing effective power to change, the feedback mechanism detects this deviation and triggers adjustments (such as modifying inverter output or heating coil parameters) to restore effective power to the target level, thereby maintaining consistent hardening quality despite positional variations.
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 system ensures precise control of the induction hardening process by accurately monitoring effective power and load impedance, ensuring consistent hardening quality even with varying load conditions and positional relations between the work and heating coil.
Implementation Method 1
high-frequency power is inputted from a high-frequency inverter 62 to the heating coil 61, thereby subjecting the work to a hardening processing
Implementation Method 2
the work is subjected to a hardening processing by high-frequency power
Implementation Method 3
A known induction hardening apparatus used in a hardening processing has an equivalent circuit configuration in which output terminals of a high-frequency inverter have therebetween a matching capacitor and a heating coil that are connected in parallel
Data Source
AI summary
An induction apparatus including a hardening control unit for controlling an induction hardening apparatus based on setup conditions data; a hardening monitoring unit that measures, as measurement data, the electric quantity in an electric circuit and that monitors an induction hardening status; and a data collecting unit that collects the data from various sensors in the induction hardening apparatus obtained when the induction hardening apparatus subjects the work to an induction hardening based on the setup conditions data outputted from the hardening control unit and that collects the measurement data from the hardening monitoring unit to store the collected data from the various sensors and the measurement data so that the collected data are associated to each other.