Implementation of an Accurate Measurement Method for the Spatial Distribution of the Electromagnetic Field in a WPT System

Abstract

In an inductive wireless power transfer (WPT) system, the transferred power depends on the coupling between the transmitter coil and the receiver coil and, consequently, on their spatial positioning with respect to each other. Since this positioning needs to be as flexible as possible, one can design various construction shapes for the coils, in terms of both winding geometry and core geometry. The system efficiency for different positionings and configurations can be assessed if the structure and distribution of the electromagnetic field (EMF) in the space close to the system are determined. In this context, this paper proposes an investigation method based on measuring the intensity of the electromagnetic field generated by the emitting coil in the WPT space in terms of both modulus and direction. The measurements needed to be performed at a sufficient number of points, so that the entire field was determined. The EMF value was estimated by linear spatial interpolation between the measured points. Moreover, this paper presents the method and the results of investigations carried out only in the presence of the emitting coil. Calibration or correction solutions were also proposed to obtain sufficient accuracy, and the viability of the method was therefore demonstrated.

Isotropic ΙoT-Based Magnetic Flux Density Meter Implementation for ELF Field Measurements

“…The first term in (11) represents the DC component of the semi-rectified signal, the second term is the 1st harmonic (base frequency), and the remaining terms are higher-order harmonics, respectively. The following is assumed in a harmonic (sinusoidal) signal:…”

“…The work in [10] introduced a sensor for isotropic magnetic and electric field measurements at frequencies less than 100 kHz, determining the electromagnetic interferences specialized in the audio frequency band. Three orthogonally oriented coils are used as an EMF sensor by the authors in [11], introducing a measurement method that enables a precise analysis of the field distribution. The study suggests a research technique that involves evaluating the strength of the electromagnetic field produced by the emitting coil in a Wireless Power Transfer (WPT) system in terms of both magnitude and direction.…”