3-D eddy current analysis in steel laminations of electrical machines as a contribution for improved iron loss modeling

Eddy-current analysis is an important research field. This phenomenon occurs in multiple areas and has several applications: electromagnetic braking, repulsive effects, levitation, etc. Thereby, this paper is limited to eddy-current study in rotating electrical machines. In the design process, if the permanent-magnet (PM) loss calculation is very important, the overheating due to eddy-currents must be taken into account. The content of this paper includes sources, calculation methods, reduction techniques, and thermal analysis of PM eddy-current losses. This review aims to act as a guide for the reader to learn about the different aspects and points to consider in studying the eddy-current.

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Eddy Current Analysis using Mixed Moving Coordinate Systems for Electrical Machines including Moving Conductors at Different Velocities

IEEJ Transactions on Fundamentals and Materials ◽

10.1541/ieejfms1990.116.2_111 ◽

1996 ◽

Vol 116 (2) ◽

pp. 111-120

Author(s):

Katsumi Yamazaki

Keyword(s):

Eddy Current ◽

Electrical Machines ◽

Coordinate Systems ◽

Current Analysis ◽

Moving Coordinate

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Determination of eddy current losses and hysteresis losses in magnetic circuits of electrical machines

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2020-11-54-58 ◽

2020 ◽

pp. 54-58

Author(s):

S. M. Plotnikov

Keyword(s):

Eddy Current ◽

Magnetization Reversal ◽

Eddy Currents ◽

Technical Problem ◽

Electrical Machines ◽

Eddy Current Losses ◽

Hysteresis Losses ◽

Magnetic Circuits ◽

Core Losses ◽

Reversal Frequency

The division of the total core losses in the electrical steel of the magnetic circuit into two components – losses dueto hysteresis and eddy currents – is a serious technical problem, the solution of which will effectively design and construct electrical machines with magnetic circuits having low magnetic losses. In this regard, an important parameter is the exponent α, with which the frequency of magnetization reversal is included in the total losses in steel. Theoretically, this indicator can take values from 1 to 2. Most authors take α equal to 1.3, which corresponds to the special case when the eddy current losses are three times higher than the hysteresis losses. In fact, for modern electrical steels, the opposite is true. To refine the index α, an attempt was made to separate the total core losses on the basis that the hysteresis component is proportional to the first degree of the magnetization reversal frequency, and the eddy current component is proportional to the second degree. In the article, the calculation formulas of these components are obtained, containing the values of the total losses measured in idling experiments at two different frequencies, and the ratio of these frequencies. It is shown that the rational frequency ratio is within 1.2. Presented the graphs and expressions to determine the exponent α depending on the measured no-load losses and the frequency of magnetization reversal.

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