A capacitor whose purpose is to be connected either in series or in parallel with a coil in a circuit. The resulting LC circuit acts as a resonator at a certain frequency denominated as the resonant frequency of the circuit, in which the reactances of the capacitance and the inductance cancel each other out.
Published in Chapter:
An Inductive Power Transfer System for the Wireless Charging of Electric Vehicles: Determination of the Magnetic Coupling Factor
Javier Vázquez (University of Castilla-La Mancha, Spain), Pedro Roncero-Sánchez (University of Castilla-La Mancha, Spain), and Alfonso Parreño Torres (Castilla-La Mancha Science and Technology Park, Spain)
Copyright: © 2019
|Pages: 31
DOI: 10.4018/978-1-5225-5870-5.ch012
Abstract
This chapter describes two methods whose purpose is to estimate the coupling factor k for the inductive coupling of an experimental prototype designed for the contactless battery charging of electric vehicles. The air gap that separates the two square-shaped coils of the inductive coupling is 150 mm. The first method is analytical and provides an expression with which to calculate the mutual inductance between both coils by solving Neumann's formula, from which k readily follows. The second approach is empirical and combines data from waveforms of currents that were obtained both experimentally and from PSpice simulations, where k is a model parameter, under different loading conditions. The agreement between the analytical and the empirical method is good, as they both yield coupling factor figures that are equal to 0.197 and 0.200, respectively. Both techniques could, therefore, be applied in order to determine the coupling factor of the constructed inductive coupling for other air gaps near to 150 mm, which are also of practical interest in electric vehicle charging.