Què hem de fer amb les pèrdues de corrent de Foucault en un inductor?

Question:
Is it true that: Today power electronics use quite a high switching frequency. Simple rules of thumb such as that “the eddy copper current losses are always negligible when the diameter of the wire is smaller than the penetration depth” are not true. However, it is clear that the main cause of the eddy current losses is caused by the presence of high frequency transverse magnetic field components. If so, what should we do with the eddy current in an inductor?
Answer:
Yes, it is true that power electronics often involve high switching frequencies, and in such cases, simple rules of thumb regarding eddy current losses may not hold. Eddy current losses in power electronics are typically associated with the presence of high-frequency transverse magnetic field components.
To address eddy current losses in an inductor, especially in the context of power electronics with high switching frequencies, you can consider the following strategies:

1. Lamination or Core Design: The core of the inductor can be made up of laminated materials to minimize eddy current losses. Laminations help to break up the continuous paths for eddy currents, reducing their impact. The use of materials with high magnetic permeability can also be beneficial.
2. Higher Resistivity Materials: Choosing materials with higher resistivity for the core and winding can help reduce eddy current losses. Materials with higher resistivity will dissipate more heat and minimize the effects of eddy currents.
3. Eddy Current Shields: Introducing shields made of high-permeability materials can be placed strategically to redirect or contain the eddy currents, preventing them from causing excessive losses in critical areas.
4. Optimized Winding Configuration: The winding configuration can be optimized to minimize the loop area, which is a factor affecting the magnitude of eddy currents. Proper design and placement of windings can help reduce losses.
5. Ferrite Materials: In some cases, ferrite materials may be used in the construction of the inductor, as they have higher resistivity and can help mitigate the effects of eddy currents.
6. Cooling Systems: Implementing effective cooling systems can help manage the heat generated by eddy current losses. This is especially important in high-frequency applications where heat dissipation becomes a significant concern.

It's crucial to note that the specific approach will depend on the application, the frequency of operation, and the design constraints. Consulting with experts in power electronics and magnetics can help tailor the solution to the specific requirements of your system.