Overview
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Induction heating is a method to produce heat using electromagnetic induction.
When a magnetic field generated by the coil produces eddy currents in the
iron sheet, the iron sheet is heated with the Joule heat produced by the
electric resistance between the eddy currents and the iron sheet. Compared
to other methods of heating, surfaces can be rapidly heated, or heating
can be localized.
This example introduces an analysis to obtain the temperature distribution
on the surface of an iron plate heated by high-frequency induction heating. |
Eddy Current Loss Density Distribution
The eddy current loss density distribution occurring in the iron sheet
and the cross-section of the iron sheet are indicted in Fig. 1 and Fig.
2.
The magnetic field generated by the coil produces eddy currents. The eddy
currents are distributed to the surface of the iron sheet by a skin effect. |
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Temperature Distribution
The thermal distribution of the iron sheet at 0.1 second, 1.0 second, and
2.0 seconds is indicated in Fig. 3. The temperature versus time is indicated
in Fig. 4, and the thermal distribution in the cross-section of the iron
sheet is indicated in Fig. 5. The temperature on the surface of the iron
sheet rises as time passes, reaching a temperature of about 100 degrees
Celsius in the iron plate under the coil at 2.0 seconds. The heat is transferred
gradually from the surface to the inside of the iron sheet, because the
eddy currents are concentrated on the surface.
The thermal distribution of the iron sheet is uneven because of the coils
geometry. The coil needs to be improved to heat the iron sheet evenly.
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