Coupled thermo-electromagnetic model of a new robotic high-frequency local induction heat treatment system for large steel components

A new robotic high-frequency local induction heat treatment system is studied. The system is designed to perform on-site local heat treatment on large steel components such as hydropower turbine runner. A flat spiral coil is moved by a robot arm over the area to treat. A fast numerical model is deve...

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Bibliographic Details
Published in:Applied thermal engineering 2019-03, Vol.150, p.372-385
Main Authors: Gendron, Mathieu, Hazel, Bruce, Boudreault, Eric, Champliaud, Henri, Pham, Xuan-Tan
Format: Article
Language:English
Subjects:
Coils
Core loss
Eddy current
Electromagnetic induction
Elliptic integral
Equivalent circuits
Ferromagnetism
Flat spiral coil
Heat transfer
Heat treating
Heat treatment
Hydroelectric power
Hysteresis models
Impedance method
Induction heating
Induction heating modeling
Local heat treatment
Lumped element
Mathematical models
Model accuracy
Mutual impedance
Mutual inductance
Numerical analysis
Power loss
Proximity effect
RLC circuits
Robot arms
Temperature
Temperature distribution
Turbines
Workpieces
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Summary:A new robotic high-frequency local induction heat treatment system is studied. The system is designed to perform on-site local heat treatment on large steel components such as hydropower turbine runner. A flat spiral coil is moved by a robot arm over the area to treat. A fast numerical model is developed to predict the temperature distribution and system settings. Several numerical strategies are proposed to minimize the computation time. The model combines an equivalent circuit with thermal finite elements and the electromagnetic mutual impedance method. A simple approach based on the concept of complex permeability is proposed to model hysteresis losses. The computed power losses in the RLC circuit and the temperature field in flat paramagnetic and ferromagnetic workpieces are compared with experimental measurements. Results confirm the accuracy of the coupled thermo-electromagnetic model.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2018.12.156