This presentation includes information on:
- When high-frequency loss effects become important in windings.
- Alternatives for modeling and optimizing windings, and when they apply.
- Alternatives for modeling core losses.
The information is from work in the field of inductor and transformer design for power electronics, and is targeted at a machine design audience, but is useful for high-frequency power transformer and inductor design as well.
Here is a pdf of the slides with references.