Open AccessDesign and analysis of decoupled tetra‐polar ring‐coils for wireless power transfer in rotary mechanism applications
Author(s) -
Zhou Wei,
Zhu Zhehui,
Mai Ruikun,
He Zhengyou
Publication year - 2020
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2019.1000
Subject(s) - inductance , decoupling (probability) , maximum power transfer theorem , wireless power transfer , control theory (sociology) , finite element method , topology (electrical circuits) , power (physics) , electronic engineering , electrical engineering , physics , engineering , computer science , electromagnetic coil , voltage , control engineering , structural engineering , control (management) , quantum mechanics , artificial intelligence
Decoupling of same‐sided coils is a critical issue for multi‐input and/or multi‐output inductive power transfer (IPT) systems. The mutual inductance between the same‐sided coils may lead to the system detuning and the decrease of power transfer capacity and efficiency. In this study, a tetra polar ring coils (TPR‐coils) and its decoupling method are proposed for IPT systems applied to rotary mechanism. Firstly, an analytical expression, which illustrates the relationship between the mutual inductance and geometric parameters of coaxial cylindrical helical coils, is given. Then the equivalent circuit model of TPR‐coils is established, and the mutual inductance constraints for the decoupling of TPR‐coils are proposed. Combined with the expression of mutual inductance, a geometric parameter solution of decoupled TPR‐coils is derived. The correctness of theoretical analysis is verified by finite element method simulations and experiments. The experimental results show that the mutual inductance between the same‐sided coils can be reduced to 0.6 μH, and the effectiveness of TPR‐coils is also verified on an IPT prototype with 231 W power and over 86% efficiency.