• Superconductivity and Cryogenics
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• v.15 no.1
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• pp.4-8
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• 2013

• NEWSLETTER 전기공업
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• no.98-2 s.195
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• pp.19-27
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• 1998

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.9 no.4
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• pp.446-453
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• 1997

The superconducting winding in rotor of a superconducting generator should be kept at extremely low temperature of 4-5 K to maintain the superconducting state. For this purpose the liquefied helium is used for the coolant and it is very important to analyze and design a cooling system making effective use of the coolant. In this paper, the typical heat exchanger of a superconducting generator with the flow passage is analyzed with regard to the thermal equilibrium. An experimental constant relevant to the flow condition in the flow passage is determined with heat exchange experiments in cryostat. Also a new heat exchanger with porous material is proposed and designed. Results of the numerical analysis for the temperature distributions for the torque tube and the coolant are reported and the efficiency of the heat exchanger is discussed from the viewpoint of amounts of coolant needed.

• NEWSLETTER 전기공업
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• no.93-1 s.74
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• pp.1-25
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• 1993

• NEWSLETTER 전기공업
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• no.98-1 s.194
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• pp.19-26
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• 1998

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 1999.02a
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• pp.142-145
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• 1999

For the first time in Korea, a 30kVA superconducting generator has been designed, developed and successfully tested recently. This is the forerunner of a 1MVA superconducting generator which is currently under development. The paper discusses the design, development and cooling experience of a superconducting rotor. This has 3 passages of the recovered Helium gas and a gas flow control system.

• Proceedings of the KIEE Conference
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• 1997.07a
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• pp.273-275
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• 1997

Superconducting Generator has different structure and characteristics from conventional generators. As a first step to designing a Superconducting Generator, this paper deals with 2D analysis models. The first model is non-slotted one and the second is slotted type. So this paper suggests the differences in 20 magnetic field analysis between two machines.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 1999.02a
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• pp.146-149
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• 1999

A 30kVA superconducting generator has been designed, developed and successfully tested recently. The design is based on 2-dimensional electromagnetic field analysis. The rotor has been wound with superconducting wire of Nb-Ti alloy. The stator has the air-gap type armature windings. Open-circuit test, short-circuit test and lamp load test have been conducted. The details of design program, design, machinebuilding, test results and conclusions are given in this paper.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2000.02a
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• pp.158-161
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• 2000

Generally superconducting generators(S. G.'s) will be classified into 2 types according to their field coil shape. The first one is race-trace type and the other is saddle type. Race-track type S.G.'s have almost the same structure with conventional salient pole generators which are being used as largely small scale machines with more than 4 poles. On the other hand saddle type S.G.'s correspond to conventional cylindrical generators with 2 poles used for large turbines in power plants. In this paper 1MVA S.G. with saddle type field coil is electromagnetically designed and based on the research results from development of 30kVA S.G. with race-track type field oils in our group. other parts such as cooling systems and power leads are presented.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2003.10a
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• pp.209-212
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• 2003

The superconducting generator and motor have many advantages over the conventional machines. The better characteristics originates from the higher magnetic field density by way of superconducting field coil which conducts the operating current with very large density. The major merits of the superconducting machines can be explained as the smaller size and weight as well as the higher efficiency. The compactness would be very useful for the applications such as ship propulsion motors and the higher efficiency is expected to play a good role in saving the electricity generation cost for the generators used in power plants. In spite of these advantages the main reason for the lazy commercialization is known as the expensiveness of the superconductors and the cryogenic systems. In this paper focusing on the superconducting generator, we will consider and estimate the economic effectiveness when the machines permeate into the actual AC generator market in Korea gradually.