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Inductive Power Transfer (IPT) techniques are gaining more and more interest in wireless power systems. The knowledge of the coupling factor of transmitter (TX) and receiver (RX) coil is a crucial, but mostly during operation not available parameter for such systems. In this manuscript a novel method to determine the coupling factor by measuring the self-resonating frequency of the postringing signal...
In wireless charging applications, it is often desirable to minimize the weight and size of the receiver coil (Rx) while the transmitter coil (Tx) may be larger so as to provide a stronger and/or more uniform magnetic field and to accommodate the magnetizing current flowing in the Tx coil. Furthermore, in many applications, the receiver coil geometry is often limited by the dimensions of the movable...
This paper presents a numerical study of the influence of a conductive defect of arbitrary width on the eddy current testing signals. The fast-forward FEM-BEM analysis solver using database is adopted for the signal simulation. The algorithm of database used here is designed for a three-dimensional defect region, and not for a two-dimensional one, with a given defect width, as usually. Thus, the signals...
An RFID tag antenna in coil form with typical credit card dimension (78 mm × 41 mm) which is suitable for ISO 14443 standards was built virtually in Electromagnetic simulator and its result was later validated with identical physical antennas. A simplified equation of inductance in microstrip form by H. A. Wheeler is then compared to result found using data from the simulation and modified to fit...
When the current sensor is working in an ideal state, there is a certain linear relationship between the primary-side coil current and the vice-side coil current. However, because of the magnetizing current, the eddy current, the magnetic flux leakage and other phenomena, the current sensor has inevitable energy losses in practical working. So when the current is very small, the linear relationship...
The optimal designs are investigated for a wireless resonant energy link (WREL) based on a nonradiative magnetic field. Internal resistance of coils is considered in relation to the coil configuration. As a result, the designs are obtained for the transmission efficiency maximum or for the effective power supply maximum. In addition, it is found that any combination of the efficiency and power supply...
The compensated networks are affected by the phase capacity asymmetry of wiring, which causes the unbalancing of the phase voltages in the tuned condition of the arc-suppression coil. In the especially unfavourable cases this effect reduces the possibility of network operation with the tuned arc-suppression coil. The operation with the arc-suppression coil out of tune is accompanied by higher values...
The MV networks are not construct as transposed that means they are non-symmetrical. This factor causes the unbalancing of the phase voltages and the zero component of voltage appears there. The distribution networks with overhead lines are operated as compensated with the arc-suppression coil connected to node of transformer. The operation with the arc-suppression coil out of tune is accompanied...
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