I wondering what is the function of ferrite core in the induction cooker coil? (In the other word why there are no ferrite core in traditional induction heater?)
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\$\begingroup\$ Increase the inductance for the driver? \$\endgroup\$– winnyCommented Jul 14, 2019 at 18:47
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2 Answers
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It's a shield. These blocks are on downside, so it diverges the field to upside that it heats only the pan and not the electronics under.
answered Jul 14, 2019 at 21:54
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There are flux concentrators used in "traditional induction heaters." Flux concentrators are commonly used in heat treat applications, and are used on the back side of the coil like in your photograph.
The flux concentrator provides a low reluctance path for the magnetic field. This lowers the coil inductance, thus lowering the Q of the coil and load. The net effect is then a higher efficiency for heating.
