High frequency, multi-phase power applications such as wireless power transfer systems, high-frequency transformers, and high-speed electric machines typically employ Litz wire to reduce AC losses. This paper provides a method to approximate the AC power loss in Litz wire systems with arbitrary field sources, accounting for local elliptically rotational fields. The general approach is demonstrated with a simplified FEA formulation and shows good alignment with explicit strand-level simulations. Focus of the analysis is placed on multi-coil, air-core applications such as resonant power transfer systems; a fast semi-analytical approach using averaging points is provided for these problems to reduce run times by several orders of magnitude.
Calculation of AC Losses in Multi-phase Litz Coil Systems
2022-06-15
4754615 byte
Conference paper
Electronic Resource
English
Litz wire terminal protection bracket for wireless charging power supply
European Patent Office | 2017
|Litz wire terminal for wireless charging power supply device
European Patent Office | 2018
|