Characterisation of factors influencing the magnetic leakage field of a 7 kW wireless electric vehicle charging system

Transfer-Power Measurement Using a Non-Contact Method for Fair and Accurate Metering of Wireless Power Transfer in Electric Vehicles

“…Very thin coaxial cable, 42 AWG (0.06335 mm outer diameter), was used for each single-turn sense coil winding. The coaxial cable was configured so the outer braid acted as an electrostatic shield from the high voltage Tx and Rx windings 16 [50]. Table III 14 The simulation uses the Manhattan sampling [49].…”

“…15 To verify, sense coil geometries outside of this search space were sampled in Monte Carlo simulations; the results do not belong to the Pareto frontier. 16 Only one terminal of the shield was grounded to preclude a shorted turn. 108.4 µH d T :i 2.5 cm r T , r R , r i : the radii of the Tx, Rx, and sense coils L T , L R : the self-inductance of the Tx (Rx) coil d T :R : the distance between the Tx and Rx coil (center to center) d T :i : the distance between the Tx (center) and sense coils i: the index of the sense coils shows the specifications of the Tx, Rx, and sense coils.…”

“…(16) P W,Tx represents the Tx winding loss, measured at the Tx coil terminal as a part of the input power; R T is the effective winding resistance, which is frequency-dependent and accounts for the skin and internal proximity effects when there is no external field. The discussion of γ R is identical to that of γ T because the transmitter and receiver can be interchanged (for example, (15) and (16) are symmetric in the sense that R can replace T in the subscripts or vice versa to obtain the other equation, hence also reflecting the symmetry of the physics). γ R encapsulates the effect of geometry in how the external field from the Rx coil affects the current density distribution in the Tx windings.…”

“…Wireless power transfer (WPT) is a fast-growing technology for charging electric vehicles (EVs) [1]- [6] with continuing achievements in maximum power transfer and high efficiency [7]- [12] along with effective coil design [13]- [15] and electromagnetic exposure safety [9], [16], [17].…”