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Charging Characteristics of Series Connected Insulation and No-Insulation HTS Coils by Rotary HTS Flux Pump
Seunghak Han;Haeryong Jeon;Ho Min Kim;Ji Hyung Kim;Yoon Seok Chae;Tae Kuk Ko;Yong Soo Yoon
High-temperature superconducting (HTS) coil wounds without turn-to-turn insulation (NI coils) present excellent electrical and thermal performance compared to HTS coil wounds with Kapton tape (INS coils). However, NI HTS coils are physically connected to power supplies at room temperature, resulting in increased operating costs due to complex cooling systems and constant heat loads. To overcome th...Show More
Optimal Design and Performance Evaluation of Dual-Capacitor Switching (DCS) Quench Protection System for Superconducting Magnet
Yojong Choi;Woo Seung Lee;Seunghyun Song;Haeryong Jeon;Tae Kuk Ko
In recent years, a new quench protection system using capacitor and switches has been announced to rapidly extract energy from high temperature superconducting (HTS) magnets. When a quench occurs, the quench protection system activates four metal oxide-semiconductor field-effect transistor switches in sequence, and the energy stored in the magnet is extracted by a capacitor to an external resistor...Show More
Overhang Effect Analysis of a Homopolar HTS Synchronous Generator Using 3D Finite Element Method
In this paper, the overhang effect of a homopolar synchronous generator with high-temperature superconducting (HTS) field winding is analyzed. Homopolar topology can be used to implement stationary field winding, which is advantageous for superconducting electrical rotating machine applications that rotate at a relatively high speed. The homopolar machine has an axial-winding radial-flux structure...Show More
A New Quench Protection System Using Dual-Capacitor Switching for Fast Energy Extraction From HTS Magnets
Yojong Choi;Woo Seung Lee;Seunghyun Song;Haeryong Jeon;Tae Kuk Ko
The high-temperature superconducting magnets with high magnetic field can store a relatively large amount of energy because of their large inductance and operating current. The magnetic energy stored in the magnet is converted into heat energy when a quench occurs, and the heat generated by the quench resistance and magnet current is sufficient to damage the magnet. Therefore, the large amount of ...Show More
Fabrication and Charging Test of HTS Field Windings Using HTS Contactless Rotary Excitation Device
Ji Hyung Kim;Huu Luong Quach;Chang-Jin Boo;Yong Soo Yoon;Haeryong Jeon;Seunghak Han;Tae Kuk Ko;Hyung-Wook Kim;Young-Sik Jo;Heui Joo Park;Jihoon Lee;Haigun Lee;Ho Min Kim
This paper presents the results of the fabrication and preliminary charging test of second-generation high-temperature superconducting (2G HTS) coils for the rotor field winding of a 1-kW-class HTS rotating machine (HTSRM). This machine technically employs an HTS contactless rotary excitation device (CRED), which is the so-called rotary flux pump, to charge the HTS field windings using a noncontac...Show More
Charging Characteristics of Rotary HTS Flux Pump With Several Superconducting Wires
Seunghak Han;Jeyull Lee;Haeryong Jeon;Ho Min Kim;Ji Hyung Kim;Young-Sik Jo;Hyung-Wook Kim;Tae Kuk Ko;Yong Soo Yoon
High-temperature superconducting (HTS) flux pumps are used to charge HTS coils at cryogenic temperatures without thermal and mechanical contact with the power supply at room temperature. We found that the larger the alternating magnetic field (AMF) penetrating into the HTS wire, the faster is the current charge rate in the HTS coil and the larger will be the amount of charge. AMF causes vortex pin...Show More
PID Control of an Electromagnet-Based Rotary HTS Flux Pump for Maintaining Constant Field in HTS Synchronous Motors
Haeryong Jeon;Jeyull Lee;Seunghak Han;Ji Hyung Kim;Chang Ju Hyeon;Ho Min Kim;Hyoungku Kang;Tae Kuk Ko;Yong Soo Yoon
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 the proportional-integral-derivative (PID) control of a rotary HTS flux pump to compensate for a change in the current in the HTS field coil of a synchronous motor under operating conditions. The f...Show More
Characteristic Analysis of a 1-kW-Class HTS Motor Considering Armature Current Information
Ji Hyung Kim;Chang Ju Hyeon;Huu Luong Quach;Sang Heon Chae;Jeyull Lee;Haeryong Jeon;Seunghak Han;Tae Kuk Ko;Yong Soo Yoon;Hyung-Wook Kim;Young-Sik Jo;Ho Min Kim
We present the results of a two-dimensional electromagnetic finite-element analysis of a 1-kW-class high-temperature superconducting (HTS) wound-field synchronous motor that considers armature-current information, i.e., current phase angle β and current Ia, for maximum torque per ampere and flux-weakening control. The torque performance was analyzed using the d- and q-axis inductances, which were ...Show More
Experimental Analysis of Charging Characteristics of HTS Field Coils With HTS Contactless Rotary Excitation Device Considering Various HTS Loads
Jeyull Lee;Haeryong Jeon;Seunghak Han;Ji Hyung Kim;Chang Ju Hyeon;Ho Min Kim;Tae Kuk Ko;Dong Keun Park;Yong Soo Yoon
In this paper, the charging characteristics of high-Tc superconducting (HTS) field coils are analyzed experimentally to verify the efficiency of using HTS contactless rotary excitation devices (CREDs). The HTS CRED is composed of eight HTS rotor strands, which are connected in series with HTS load coils, and eight neodymium permanent magnets (N50). The magnetic field of N50 is approximately 0.14 T...Show More
Methods for Increasing the Saturation Current and Charging Speed of a Rotary HTS Flux-Pump to Charge the Field Coil of a Synchronous Motor
Haeryong Jeon;Jeyull Lee;Seunghak Han;Ji Hyung Kim;Chang Ju Hyeon;Ho Min Kim;Dongkeun Park;Yoon Do Chung;Tae Kuk Ko;Yong Soo Yoon
The rotary flux-pump using HTS tape has been studied for superconducting rotating machinery application. The charging speed and saturation current of the rotary HTS flux-pump is closely related to magnetic flux linkage passing through the HTS tape. To analyze charging parameters that effect pumping rate and saturation current of the flux-pump, methods of changing the rotating speed, shape of perma...Show More
Degradation of Critical Current in an HTS Tape With Combined Bending and Torsion Considering Curvature of Elliptical Shape
Seunghak Han;Jeyull Lee;Haeryong Jeon;Ji Hyung Kim;Chang Ju Hyeon;Ho Min Kim;Hyoungku Kang;Tae Kuk Ko;Yong Soo Yoon
Degradation of critical current (Ic) in a high-temperature superconducting (HTS) tape under bending conditions had been previously investigated. These investigations were focused on only either bending or torsion. A rotating flux pump is used to study the charging characteristics of an HTS synchronous motor. In order to design the rotating flux pump connected in series, the elliptical winding appl...Show More
A Study on the YBCO-Coated Conductor Current Lead With Asymmetric Structure Tape Considering Temperature Distribution
Seokho Nam;Woo Seung Lee;Jeyull Lee;Haeryoung Jeon;Seunghak Han;Yojong Choi;Jiho Lee;Tae Kuk Ko
A current lead is a connecting device between the superconducting magnet and the power supply. A large amount of heat transfer ocurrs through the current lead because the cold-end in a superconducting system is thermally linked with the warm-end part. Therefore, high-Tc superconductor (HTS) is used in the current lead for a tokamak system. However, it is hard to consider the dependance of HTS's cr...Show More
Analysis of the Notch Effect on Flux Diverters for High-Temperature Superconducting Magnets
Seunghyun Song;Woo Seung Lee;Young Gun Park;Seokho Nam;Haeryong Jeon;Geonwoo Baek;Min Cheol Ahn;Jiho Lee;Yojong Choi;Tae Kuk Ko
Flux diverters made of ferromagnetic materials can be used in high-temperature superconducting (HTS) magnets to change the magnetic field distribution and increase the critical current of the magnet. In this paper, the notch-shaped flux diverter increases the critical current of the HTS magnet by detouring the magnetic flux more effectively than the flat surface-shaped (simple) flux diverter. Nume...Show More
Experimental Analysis on AC Loss and Fault Current Test of HTS Coils Co-Wound With Various Inserted Materials
Jinsub Kim;Seokho Nam;Haeryong Jeon;Junseong Kim;Jae Young Jang;Tae Kuk Ko
A significant number of recent studies have explored the impact of many kinds of winding insulation conditions on high-temperature superconducting (HTS) coils for the application of electric devices. HTS coil co-wound with turn-to-turn inserted materials could be an appropriate alternative to the no-insulation coil because of the poor charge-discharge delay and unexpected quench behavior of the no...Show More
Magnetic Field Stability Analysis on No-Insulation and Turn-to-Turn Soldered HTS Magnets Under Sinusoidal Noise Operation
Woo Seung Lee;Young Gun Park;Jinsub Kim;Seunghyun Song;Haeryong Jeon;Young-Gyun Kim;Haigun Lee;Tae Kuk Ko
The field stability of a no-insulation and a turn-to-turn soldered high-temperature superconducting (HTS) magnet is analyzed under sinusoidal noise operation. The stability of the magnetic field is a critical factor for some applications such as nuclear magnetic resonance (NMR) spectrometer. The no-insulation and turn-to-turn soldered HTS magnets have intrinsic residual resistance which acts like ...Show More
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