Design of a Novel Rotary Transformer With Accurate Prediction of Nanocrystalline Alloy Core Loss Using Improved Steinmetz Formulation

In order to improve the transmission efficiency, a novel rotary transformer with nanocrystalline strip served as the core material is proposed to power the electrical equipment on the rotating shaft. The magnetic properties of the high-frequency core material are measured under the excitation of sine wave and square wave respectively. An improved Steinmetz empirical equation is proposed by studying the nonlinearity of the Steinmetz empirical coefficient at different characteristic frequencies. The structure of the rotary transformer is designed, and the core loss is calculated using the proposed loss model. An effective wireless power transmission is obtained, which provides a new scheme for the design of rotary transformers.