Abstract
In high-speed permanent magnet synchronous generator (PMSG), the rotor design should not only ensure mechanical stability at high speeds but also ensure the required electromagnetic (EM) performance. This paper deals with the EM analysis and design of high-speed PMSGs considering the rotor structure. In particular, the effects of active power and output voltage due to internal impedance from leakage flux are presented. The relationship between design variables of rotor and performance is analyzed using three-dimensional static finite element analysis and simplified equivalent circuit method. Based on the analysis results, a model with improved EM performance using a nonmagnetic pad is presented according to design parameters of rotor structure. The EM performance and the mechanical reliability of the designed model are validated by comparing the FE results with experimental results.
Highlights
H IGH-SPEED permanent magnet synchronous generators (PMSGs) are gaining considerable attention from researchers as well as the industry worldwide owing to their many advantages, such as high efficiency, high power density, simple mechanical construction, no excitation loss, and ease of maintenance [1], [2]
The analysis results of the flux linkage and inductance of the highspeed PMSG considering the rotor shaft are in good agreement with measured results; the errors are 0.3% and 4%, respectively
To evaluate the output of the PMSG itself, the EM performance can be measured by connecting the resistance of each phase to the wye connection
Summary
H IGH-SPEED permanent magnet synchronous generators (PMSGs) are gaining considerable attention from researchers as well as the industry worldwide owing to their many advantages, such as high efficiency, high power density, simple mechanical construction, no excitation loss, and ease of maintenance [1], [2]. As a result of these advantages, high-speed PMSGs are well-suited for such as home appliances, aerospace technology, marine technology, and flywheel energy storage systems [3]. Despite these advantages as mentioned earlier, the rotor requires a complicated design process using electromechanical analysis in order to secure required electromagnetic (EM) performance and ensure mechanical stiffness for high speed operation [4]–[12]. This paper deals with how to analyze and improve a problem in which a PMSG does not meet the required active power and output voltage due to an increase in internal impedance of the PMSG with leakage flux of the rotor shaft. Color versions of one or more of the figures in this article are available online at http://ieeexplore.ieee.org
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