Electromagnetic field generated by a wireless energy transfer system: comparison of simulation to measurement

Abstract

This paper presents a wireless energy transfer system operating at the frequency values of kHz order: modeling, simulation, and comparison with prototype measurement results. Wireless energy transfer system model using finite element method was carried out to simulate the electric field and the magnetic flux density for different air gap sizes between the transmitter and the receiver coils. Results are presented and compared with the electromagnetic emission measurements radiated by the wireless energy transfer system prototype. The electric field comparison between the simulated and the prototype measurement values shows an error of roughly 8.7%. In the recent years, the interest in the wireless energy transfer technology, especially for electric vehicles batteries charging, is rapidly increasing. As a result of the increasing application of this technology in the industrial and consumer electronic products, more concerns are raised about the electromagnetic compatibility, since the wireless energy transfer systems produce electromagnetic emissions in the surrounding environment.

Omnidirectional WPT and Data Communication for Electric Air Vehicles: Feasibility Study

“…where θ = [0, π], M max is maximal mutual inductance between the two coils and can be computed by (15) in which µ is air permeability, N 1 and R 1 are the number of turns and radius of the transmitting coil, N 2 and R 2 are the number of turns and radius of the receiving coil, respectively, and d s1 is the distance between the centers of the two coils given by [33]:…”

“…At high frequency, electromagnetic interferences (EMI) become an important issue where the high-intensity EMF can have a harmful impact not only on the surrounding equipment and the exchange of the data between the transceivers but also on the human safety. In fact, to figure out the range of interference generated by WPT equipment, serval studies are proposed [12][13][14][15]. Firstly, a study related to the electromagnetic emissions from WPT effects are discussed in [12,13].…”

“…Firstly, a study related to the electromagnetic emissions from WPT effects are discussed in [12,13]. However, it is crucial to assure that the EMI generated by the wireless power transfer system will not influence or disrupt the communication between the transmitter and the receiver [14,15]. Additionally, better optimization of the power and data links can be achieved by separating the frequency band of the data and power signal; the power signal carries no information and the power transfer efficiency is maximized for a narrow-band (e.g., high Q) link that usually operates at low frequencies.…”

“…Additionally, better optimization of the power and data links can be achieved by separating the frequency band of the data and power signal; the power signal carries no information and the power transfer efficiency is maximized for a narrow-band (e.g., high Q) link that usually operates at low frequencies. On the other hand, data signal is realized at much higher frequencies, particularly in the GHz order [14,15]. The experimental results of measurement and the analysis of the electromagnetic fields generated by WPT system as well as their possible interaction on data transmission channel are reported in [13,14].…”

Wireless Battery Charger for EV with Circular or Planar Coils: Comparison

“…The WET at mid-range distances is carried through the air and based on the magnetic field. Therefore, the study of the magnetic field created by different types of coils is very important [17,18]. In this case study the comparison of the magnetic field originated by a planar coil and by a circular coil is made.…”