Finite Element Modeling and Analysis of High Power, Low-loss Flux-Pipe Resonant Coils for Static Bidirectional Wireless Power Transfer

Abstract

This paper presents the optimal modeling and finite element analysis of strong-coupled, high-power and low-loss flux-pipe resonant coils for bidirectional wireless power transfer (WPT), applicable to electric vehicles (EVs) using series-series compensation topology. The initial design involves the modeling of strong-coupled flux-pipe coils with a fixed number of wire-turns. The ohmic and core loss reduction for the optimized coil model was implemented by creating two separate coils that are electrically parallel but magnetically coupled in order to achieve maximum flux linkage between the secondary and primary coils. Reduction in the magnitude of eddy current losses was realized by design modification of the ferrite core geometry and optimized selection of shielding material. The ferrite core geometry was modified to create a C-shape that enabled the boosting and linkage of useful magnetic flux. In addition, an alternative copper shielding methodology was selected with the advantage of having fewer eddy current power losses per unit mass when compared with aluminum of the same physical dimension. From the simulation results obtained, the proposed flux-pipe model offers higher coil-to-coil efficiency and a significant increase in power level when compared with equivalent circular, rectangular and traditional flux-pipe models over a range of load resistance. The proposed model design is capable of transferring over 11 kW of power across an airgap of 200 mm with a coil-to-coil efficiency of over 99% at a load resistance of 60 Ω.

Enhancing electric vehicle charging performance through series-series topology resonance-coupled wireless power transfer

“…When an EV parks over the pad, a magnetic field is generated, inducing an alternating current in a receiving coil on the vehicle’s underside. This induced electricity charges the vehicle’s batteries, providing a reliable and convenient charging method [ 11 , 12 ]. Charging methods include static charging (when the vehicle is stationary), stationary charging (at designated areas, even while the vehicle’s engine is operational), and dynamic charging (while the vehicle is moving on a road equipped with electronic infrastructure).…”

On the possibility of wireless battery charging in a gaseous-and-dusty mine

“…Considering that the joint analytical solution of ( 1), ( 2), and ( 6) can be very complicated, a possible solution to the described problem is the use of finite element models, which can be used to simulate electromagnetic and thermal fields in the charging area in a three-dimensional setting taking into account the physical properties of the materials of the transmitting and receiving coils and foreign conductive object, as well as the physical properties of a hazardous explosive atmosphere, in combination with the dynamic models of the electrical circuits of the wireless charger in the state space. Such models are considered, for example, in [19,20].…”

Design Methodology and Circuit Analysis of Wireless Power Transfer Systems Applied to Electric Vehicles Wireless Chargers

“…The reactive components added to the system and known as the compensation networks can be inserted in the transferring side and the receiving side under different topologies. In this type of system, the coil design, the circuit design, and the compensation networks are the main elements to be considered [1,2].…”