Modal theory of eddy currents in thin circular plates

1994 ◽  
Author(s):  
P.P. Silvester
Keyword(s):  
Eddy Currents ◽  
Circular Plates ◽  
Modal Theory

Cavitation in normal separation of square and circular plates

1996 ◽  
Vol 22 ◽  
pp. 149
Author(s):  
S Boedo
Keyword(s):  
Circular Plates ◽  
Normal Separation

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

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.

Modal Theory, Church Keys, and the Sonata at the End of the Seventeenth Century

1998 ◽  
Vol 51 (2) ◽  
pp. 245-281 ◽  
Author(s):  
Gregory Barnett
Keyword(s):  
Seventeenth Century ◽  
Modal Theory

First-order-theory-based thermoelastic stability of functionally graded material circular plates

AIAA Journal ◽  
2002 ◽  
Vol 40 ◽  
pp. 1444-1450 ◽  
Author(s):  
M. Najafizadeh ◽  
M. R. Eslami
Keyword(s):  
Functionally Graded Material ◽  
Order Theory ◽  
Functionally Graded ◽  
Circular Plates ◽  
First Order ◽  
First Order Theory ◽  
Graded Material

Relationships between classical and shear deformation theories of axisymmetric circular plates

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 1862-1868
Author(s):  
J. N. Reddy ◽  
C. M. Wang
Keyword(s):  
Shear Deformation ◽  
Circular Plates ◽  
Shear Deformation Theories

Hidden Crack Detection with GMR Sensing of Magnetic Fields from Eddy Currents

2007 ◽  
Author(s):  
Ray T. Ko ◽  
Shamachary Sathish ◽  
Jeremy S. Knopp ◽  
Mark P. Blodgett
Keyword(s):  
Magnetic Fields ◽  
Crack Detection ◽  
Eddy Currents
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