Electrical Design of a 17 MW Class HTS Motor for Ship Propulsion
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O R I G I N A L PA P E R
Electrical Design of a 17 MW Class HTS Motor for Ship Propulsion Seungkyu Baik · Youngkil Kwon
Received: 7 November 2012 / Accepted: 1 December 2012 / Published online: 5 January 2013 © Springer Science+Business Media New York 2013
Abstract A superconducting motor shows several advantages, such as smaller size and higher efficiency, over a conventional motor, especially utilized in ship propulsion applications. However, the size reduction merit appears for large capacity, more than several MW. We develop a large capacity synchronous motor with a rotating high-temperature superconducting (HTS) coil, that is aimed to be utilized for ship propulsion, so it has a low rotating speed of about 200 rpm. The ship propulsion motor must generate high electromagnetic torque instead of low speed. Therefore, the rotor (field) coils have to generate a large magnetic flux that results in a large amount of expensive HTS conductor for the field coil. In this paper a 17 MW HTS motor for ship propulsion is designed with a cost-effective method because the HTS conductor cost is a critical factor in the construction of an HTS motor. Unlike conventional rotating machines, the superconducting motor consists of an ironcoreless structure. Most conventional motors can be designed with small error based on two-dimensional magnetic field analysis. However, the superconducting motor shows an even larger error between the two- and three-dimensional based designs. Thus, in order to improve the design accuracy, we have calculated the back electromotive force (EMF) using 3D magnetic field analysis. An output performance evaluation has also been carried out to obtain a design with higher efficiency.
1 Introduction
Keywords Superconducting motor · Ship propulsion · HTS · Conductor cost · Design accuracy · Efficiency
2 Conceptual Design of 17 MW Ship Propulsion HTS Motor
S. Baik () · Y. Kwon Superconducting Devices & Cryogenics Group, Korea Electrotechnology Research Institute, P.O. BOX 20, Chang Won, South Korea e-mail: [email protected]
The conventional motor has an iron-cored structure both at the field coil part and at the armature coil part, so it has a very small air gap between the field and the armature. However, the air-cored type HTS motor has iron just at the machine shield, shown in Fig. 1 as a cylindrical structure
It is expected that the first commercial application of a hightemperature superconducting (HTS) motor will be marine transportation. In particular, weight and size reduction in electrical propulsion systems of navy and commercial vessels increases design flexibility, providing critical benefits. Electrical propulsion systems have already penetrated the cruise ship market due to their advantages over mechanical propulsion systems. Besides its other merits, an HTS-based ship propulsion system is more attractive in an electrical propulsion system because of the improved power density and operational efficiency. In this paper a 17 MW class HTS synchronous motor with a rotating HTS field coil is cons
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