Preliminary Design of a Mid-Range Superconducting Wireless Power Transfer System for Magnetic Levitation Vehicles: Application to the MagLev-Cobra

Abstract

This work presents a mid-range wireless power transfer (WPT) system that uses a high-temperature superconducting coil in the transmitter circuit to increase the efficiency of the system. The presented system is foreseen to provide energy to superconducting magnetic levitation vehicles and is intended to be implemented in the Brazilian MagLev-Cobra. The developed concept is based on an Inductive Power Transfer (IPT) system, using magnetic core reactors (MCR) to tune the resonant frequency under load variations, which arise in the charging process of the vehicle. Based on this architecture, the proof of concept was demonstrated in a laboratory-scale system, namely by assessing the performance as a function of the distance between the receiver and the transmitter coils, as well as its misalignment.Keywords-high-temperature superconductors (HTS), inductive power transfer (IPT), magnetic core reactor (MCR), wireless power transfer (WPT)

Research on Double LCC Compensation Network for Multi-Resonant Point Switching in Underwater Wireless Power Transfer System

“…transmission power is, which is the same as the simulation results. It can also be seen from the figure that the coupling coefficient at the lowest power point and the efficiency point is 0.4, which is the same as the calculation result of Equation (26) and is obviously the switching point of the resonant frequency. When the coupling coefficient ranges from 0.2 to 0.6, the transmission power of the conventional double LCC compensation system declines by nearly 1.9 kW, and the transmission efficiency decreases by approximately 8% to 5.5%.…”

“…Wh there is an offset between the receiving and transmitting coils, the power transmission Underwater wireless power transmission can be widely used in autonomous underwater vehicles (AUVs) and robots and can also provide reliable energy supply for ocean observation and monitoring systems. A typical magnetic coupling resonant underwater wireless power transfer system comprises four parts: a high-frequency inverter circuit, a coupling mechanism, a compensation network, and a high-frequency rectifier circuit [25][26][27][28]. The transmitting end is provided with DC input by the underwater cable or the mother ship.…”

“…The parameters of the selected double LCC resonance compensation system were obtained through the above analysis, as listed in Table 1. Substituting λ P and λ S in Table 1 into Equation (26), the coupling coefficient at the time of frequency switching can be obtained as 0.4. When k > 0.4, ω 2 is employed for underwater wireless power transfer system transmission.…”

Artificial intelligence methods for applied superconductivity: material, design, manufacturing, testing, operation, and condition monitoring

“…Therefore, energy storage means, namely batteries, also need to be onboard, as well as dedicated power converters to charge them at stations, while the train is stopped. These batteries need to supply the linear motor (although only tenths of kWh have been reported for Cobra, the Brazilian MagLev, to travel between stations 200 m apart), but also all ancillary systems, as air conditioning, which can be several orders above the energy required for the motor [366]. The technical and economic optimization of SML MagLevs is thus a multi-objective problem where AI provides powerful tools for its solution.…”

Technology Trends of Wireless Power Transmission Systems Using High Temperature Superconducting Coils

“…) Fig. 4 磁界共振結合型非接触給電システムの等価回路 16,[25][26][27]33,34) だけでなく， HTS コイルと銅コイルを用いた非接触給電システム [28][29][30][31][32][36][37][38][39][40][41] や中継コイルに HTS コイルを用いた非接触給電システム 38) も報告されている。さらに，使用されている HTS 線材に は，Re 系や Bi 系の HTS 線材単体だけでなく，Re 系線材を…”