Rotary HTS flux pumps are suitable for cryogenic applications, where it is difficult to implement direct physical connections between the device in question and an external power supply. Here we examine proportional-integral-derivative (PID) control of a rotary pump compensate change current field coil synchronous motor under operating conditions. The must be maintained constant prevent output fluctuation motor. In this context, prototype with rotating tape constructed study. A 600-turn...

Our research team has been developing a wireless power charging (WPC) system for electric vehicle (EV) using superconducting and normal conducting resonance coils in order to improve the transfer efficiency stability. In practical approach, EV, which is installed outside, wirelessly charged without moving. The antenna (Tx) coil disclosed by rain or snow so on. From this reason, characteristics surrounded water circumstance, i.e., fresh salt water, should be evaluated commercialize addition,...

The rotary flux-pump using HTS tape has been studied for superconducting rotating machinery application. charging speed and saturation current of the is closely related to magnetic flux linkage passing through tape. To analyze parameters that effect pumping rate flux-pump, methods changing speed, shape permanent magnet, width tape, intensity have investigated in previous studies [1]- [3]. In this paper, we tried test three cases investigate current: 1) two different background materials,...

Abstract This paper deals with the fabrication and performance testing of a prototype machine for world’s first implementation new type high-temperature superconducting rotating (HTSRM), which is charged operated by application contactless excitation technique rotary-type HTS flux pump based on permanent magnet. Although this has been actively applied in stationary applications, its practical demonstration rotary namely, machines, not yet conducted or reported. Therefore, laboratory-scale...

High-temperature superconductors (HTSs) have a much larger thermal margin than low-temperature superconductors, owing to their high critical temperatures. This characteristic allows HTS magnets tolerate extremely heat loads that may arise from radiation. Therefore, research on the development of quadrupole is progressing widely. Quadrupole are commonly used for focusing transported beams particles in accelerators. In order focus beam, magnet uses an iron yoke with hyperbolic contour....

This paper deals with the analysis of electromagnetic and mechanical properties a high-temperature superconducting (HTS) coil, as well its characteristic determined through tests using strain gauges. When an operating current is applied to HTS generated by force. However, additional effects in coil are formed Joule heating during quench. Strain was measured full-bridge gauge mounted directly over turns. We fabricated wound single pancake type investigate characteristics. also investigated...

In this paper, the charging characteristics of high-Tc superconducting (HTS) field coils are analyzed experimentally to verify efficiency using HTS contactless rotary excitation devices (CREDs). The CRED is composed eight rotor strands, which connected in series with load coils, and neodymium permanent magnets (N50). magnetic N50 approximately 0.14 T when air gap between strand 8 mm. order proper method, two types experiments performed. first experiment, loads charged by strands CRED....

High-temperature superconducting (HTS) flux pumps are used to charge HTS coils at cryogenic temperatures without thermal and mechanical contact with the power supply room temperature. We found that larger alternating magnetic field (AMF) penetrating into wire, faster is current rate in coil will be amount of charge. AMF causes vortex pinning wire move, resulting dynamic resistance (Rdyn) electromotive force (EMF). Charging characteristics determined by Rdyn EMF which generated effective...

This paper deals with the effect of magnetic flux diverters on current decay behaviors high-temperature superconducting (HTS) coils which operate in semipersistent mode (PCM) under alternating field. In synchronous machines, HTS field coil can be designed to PCM obtain a steady during operation. Due from armature winding, winding experiences an external As result, additional magnetization ac loss would induced, and it affects characteristics. order improve behavior coil, use diverter made...

This paper examines the effect of improved winding geometry on high-temperature superconducting (HTS) coils for use in power applications. One most important functions such a magnetic energy storage system is to charge–discharge as fast possible secure sufficient demand. The HTS are vulnerable thermal instability caused by cyclic and/or unexpected variation. Therefore, it necessary enhance safety under response operation at request varying loads. In this study, stability over-current...

We present the results of a two-dimensional electromagnetic finite-element analysis 1-kW-class high-temperature superconducting (HTS) wound-field synchronous motor that considers armature-current information, i.e., current phase angle β and I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">a</sub> , for maximum torque per ampere flux-weakening control. The performance was analyzed using d- q-axis inductances, which were estimated when varied....

Generally, in order to detect the quench of superconducting field coil for rotating machine, signal wires voltage taps are indispensably needed. However, problem conventional method is wire twisting as rotates. Therefore, this paper, authors suggest a new using electromagnetically coupled coils. The suggested consists two pancake and copper solenoid Two coils play roles external (alternating) generation machine. In addition, used transmit wirelessly receive transmitted electromagnetic...

This paper presents the analysis of a high-Tc superconducting (HTS) power converting system, as well its operational characteristics. The system can be used to charge and discharge magnet made series-connected pancake coils. HTS consists two heaters, primary copper winding, secondary coil, an iron core conventional load. In experiments, charging discharging periods were 7.5 2 s, respectively. A partial region tape in winding is switched normal by buried heating coil. To measure...

Degradation of critical current (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> ) in a high-temperature superconducting (HTS) tape under bending conditions had been previously investigated. These investigations were focused on only either or torsion. A rotating flux pump is used to study the charging characteristics an HTS synchronous motor. In order design connected series, elliptical winding applied together with combined and...

Recently, superconducting power applications by using the high-temperature (HTS) tape have been widely researched due to development of HTS tape. In particular, coils cowound with insulation materials dominantly used for applications. However, insulated coil has low thermal stability at overcurrent operation, which causes much likely be damaged. To relieve this issue, other methods such as insulation-free or partial investigated. These good stability; however, they weaknesses magnetic field...

Alternating field causes energy loss due to induced back electromotive force (EMF) high-temperature superconducting (HTS) coils in the electric machines. Therefore, a method of reducing effects alternating fields on HTS machines according winding insulation conditions has been investigated. In addition, cowound with turn-to-turn inserted materials control time constant proposed. The charge-discharge delay can be determined constant, also is related radial directional resistance no-insulation...

A current lead is a connecting device between the superconducting magnet and power supply. large amount of heat transfer ocurrs through because cold-end in system thermally linked with warm-end part. Therefore, high-Tc superconductor (HTS) used for tokamak system. However, it hard to consider dependance HTS's critical respect temperature conventional HTS leads consist tapes same width thickness, their currents can differ from temperature. For this reason, section designed excessively than...

In this paper, we present the fabrication and experimental analysis of a 6.6 kV/100 A class superconducting fault current controller (SFCC) as novel prototype limiter. Recently, integration distributed generations into grid has been issued due to increased power demand their lower environmental impacts. The addition generators can increase level in grid. To resolve issue level, propose SFCC consisting coil, full-bridge thyristor rectifier, control unit. proposed be described combination type...

Most superconducting devices are designed for a fixed operating temperature range, however, varia- tions inevitable in some situations. For example, the of resistive-type fault current limiter becomes higher during cycle operation. Therefore, knowledge dependence current-to-voltage characteristic is necessary accurate simulation or design processes. This paper explores n-index, which describes sharpness superconductivity to normal transition, using second-generation high-temperature tape...

In this paper, characteristics of a thermally and magnetically triggered switch for high-Tc superconducting (HTS) power converting system are experimentally analyzed. For verifying the efficiency suggested switch, current charging discharging tests using heater-triggered with or without an external magnetic field performed. Charging performed two sequences, i.e., CS1 CS2. Each sequence is experimented kinds heater currents to maintain different temperatures. Saturation saturation time...

Recently, many researches on the system of superconducting power supply and magnetic energy storage (SMES) using high temperature (HTS) tapes has been progressed. Those kinds devices use heater trigger switches that have a control delay problem at moments heating up cooling down. One way to reduce time is different HTS tape part. For example, having lower critical can down stage for operation. This paper deals with resistances joint which properties verify usefulness suggested method. Three...

This paper presents experimental results of the designed high-Tc superconducting (HTS) power converting system with multiple GdBCO magnets. The is tested by various sequential controls four heater-triggered switches and an electromagnet, which consists two energy storage magnets (ESMs). experiments are mainly composed modes. first one a simultaneously operating mode (Mode1), another alternative (Mode2). Each sequences performed at Mode1 (CS1 CS2) Mode2 (CS3 CS4) for charging ESMs,...