Overview
Closeup |
An IH cooking heater uses induction heating to heat the pot for cooking
food. So it is important to heat the bottom of the pot uniformly, and also
to prevent flux leakage into the board box.
In JMAG, the eddy current loss density distribution obtained by magnetic
field analysis can be used for thermal analysis.
This note presents the use of the coupled magnetic field analysis and thermal
analysis to obtain the temperature distribution of the iron pot. |
Magnetic Flux Density Distribution
Closeup |
Figure 1 shows the magnetic flux density distribution of the IH cooking
heater. Since the aluminum plate on the board box shields magnetic flux,
magnetic flux density in the board box is seen to be less dense. |
Eddy Current Loss Density Distribution
| Figure 2 shows the eddy current loss density distribution of the iron pot.
Magnetic field generated by the coil produces eddy currents on the surface
of the iron pot, and then electric resistance of the iron pot produces
Joule heat. |
Closeup |
Temperature Distribution
Closeup |
Figure 3 shows the temperature distribution of the iron pot. The iron pot
is heated by eddy currents. The temperature rises over time and the temperature
of the bottom of the iron pot reaches 100 degrees Celsius at 60 seconds.
In this analysis, the temperature rise of the bottom of the iron pot is
not uniform. To heat the bottom of the iron pot uniformly during heating,
the coil arrangement and the core geometry need to be improved. |
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