Byung-Chul Woo

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To accomplish the research of a PM synchronous motor driven by 15kW at a rated speed of 120krpm, this paper represents an approach to minimize the eddy current losses that occur frequently at high speeds. Various simulation and testing techniques are therefore applied to grasp the physical phenomena. Here, the proposed parameter for analysis is sleeve(More)
The objective of the present study was to deal with the rotordynamics of the rotor of an ultra-high speed PM type synchronous motor-generator for a 500 W rated micro gas turbine generator. This paper introduces dynamic analysis, and experiments on the motor-generator. The focus is placed on an analytical approach considering the mechanical dynamic problems.(More)
In this paper, formulas to calculate possible UMFs during assembly process are introduced in order to save calculation time and efforts without using a fully configured 3-dimensional (3-D) analysis model. To calculate the UMFs according to the degree of rotor eccentricity in every time that the rotor position is relatively changed to the stator position in(More)
The high speed permanent-magnet synchronous generator is an important component of micro gas turbine. One of the major problems in micro turbine generator is an increase in iron loss with increasing rotational speed. In order to minimize the iron loss, PNF-Core (20PNF1500, posco electrical steel) is used for stator core. The core has good magnetic(More)
This paper presents an optimum design of a lightweight vehicle levitation electromagnet, which also provides a passive guide force in a magnetic levitation system for contactless delivery applications. The split alignment of C-shaped electromagnets about C-shaped rails has a bad effect on the lateral deviation force, therefore, no-split positioning of(More)
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