An IH cooking heater cooks food by heating a pot that acts as a conductive body. It heats this pot with an induction heating method that uses electromagnetic induction. Eddy currents flow in the iron pot when a high frequency current is applied to the coil. These eddy currents produce joule loss, which acts as a heat source to raise the temperature of the iron pot. When designing the heating coil, the main points to look out for are: What kind of magnetic circuit design will raise heating efficiency, and whether it is generating uniform heat in the iron pot. Another factor is controlling leakage flux to the circuit component in the board box that surrounds the apparatus.
A magnetic field analysis simulation that uses the finite element method (FEM) is best for studying a three dimensional combination of the geometry, number, and alignment of the magnetic material that adjusts the magnetic circuit, and for quickly obtaining the electric circuit constant of the high frequency circuit that performs the heating.
This Application Note shows how to obtain the magnetic flux density surrounding an IH cooking heater that uses high frequency induction heating and the temperature distribution of its iron pot.

Fig. 1 shows the magnetic flux density distribution of the IH cooking heater. The aluminum plate on the board box shields it from magnetic flux, reducing the amount of leakage flux that flows to it.