An algebraic approach for identifying operating point dependent parameters of synchronous machines using orthogonal series expansions

2001 ◽  
Vol 16 (1) ◽  
pp. 92-98 ◽  
Author(s):  
J.J.R. Melgoza ◽  
G.T. Heydt ◽  
A. Keyhani ◽  
B.L. Agrawal ◽  
D. Selin
Keyword(s):  
Orthogonal Series ◽  
Algebraic Approach ◽  
Synchronous Machines ◽  
Operating Point ◽  
Series Expansions

The Study on Dual Excitation Synchronous Permanent Magnets Synchronous Machines for Electrical Vehicle

2012 ◽  
Vol 490-495 ◽  
pp. 797-801
Author(s):  
Bing Wang
Keyword(s):  
Permanent Magnets ◽  
Synchronous Machine ◽  
Driving Cycle ◽  
Synchronous Machines ◽  
Operating Point ◽  
Control Parameters ◽  
Power Losses ◽  
Electrical Vehicle ◽  
Dc Excitation

In this paper we presented the study of a dual excitation synchronous machine designed for dual electrical or full electrical vehicle application. This machine combines two excitation flux sources: permanent magnets and DC excitation coils that are situated in the stator and the rotor is fully passive. For the studied application, the considered driving cycle was presented and it was shown that the required performances are highly variables. We presented with details the Dual Excitation Synchronous Machine Flux Switching (DEFSSM) for witch control parameters were optimized in order to optimize power losses for each operating point of the considered driving cycle.

scholarly journals Eigenfunction expansion of generalized functions

1978 ◽  
Vol 72 ◽  
pp. 1-25 ◽  
Author(s):  
J. N. Pandey ◽  
R. S. Pathak
Keyword(s):  
Hilbert Space ◽  
Eigenfunction Expansion ◽  
Orthogonal Series ◽  
Integral Transforms ◽  
Generalized Functions ◽  
Series Expansions ◽  
Schwartz Distributions ◽  
Space Technique

Expansions of generalized functions have been investigated by many authors. Korevaar [11], Widlund [20], Giertz [8], Walter [19] developed procedures for expanding generalized functions of Korevaar [12], Temple [17], and Lighthill [13], Expansions of certain Schwartz distributions [15] into series of orthonormal functions were given by Zemanian [23] (see also Zemanian [24]) and thereby he extended a number of integral transforms to distributions. The method involved in his work is very much related to the Hilbert space technique and is of somewhat different character from those used in most of the works on integral transforms such as [24, chapters 1-8]. Other works that discuss orthogonal series expansions involving generalized functions are by Bouix [1, chapter 7], Braga and Schönberg [2], Gelfand and Shilov [7, vol. 3, chapter 4] and Warmbrod [21].

Autofocusing with the help of orthogonal series transforms

2010 ◽  
Vol 56 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Przemysław Śliwiński
Keyword(s):  
Trigonometric Polynomial ◽  
Orthogonal Series ◽  
Formal Analysis ◽  
Series Expansions ◽  
Digital Cameras ◽  
Generic Algorithm ◽  
Autofocus Algorithm ◽  
Wavelet Series

Autofocusing with the help of orthogonal series transformsAn autofocus algorithm employing orthogonal series expansions is proposed. Several instances of the generic algorithm, based on discrete trigonometric, polynomial and wavelet series, are reviewed. The algorithms are easy to implement in the transform coders used in digital cameras. Formal analysis of the algorithm properties is illustrated in experiments. Some practical issues are also discussed.

Field Distribution of Strongly Excited Magnetic Lenses

1975 ◽  
Vol 33 ◽  
pp. 140-141
Author(s):  
M. Strojnik
Keyword(s):  
Flux Density ◽  
Field Distribution ◽  
Optical Axis ◽  
Operating Point ◽  
Pole Piece ◽  
Partial Saturation ◽  
Axial Flux ◽  
The Stability

Magnetic lenses operating in partial saturation offer two advantages in HVEM: they exhibit small cs and cc and their power depends little on the excitation IN. Curve H, Fig. 1, shows that the maximal axial flux density Bz max of one of the lenses investigated changes between points (3) and (4) by 5% as the excitation varies by 40%. Consequently, the designer can relax the requirements concerning the stability of the lens current supplies. Saturated lenses, however, can only be used if (i) unwanted fields along the optical axis can be controlled, (ii) 'wobbling' of the optical axis due to inhomogeneous saturation around the pole piece faces is prevented, (iii) ample ampere-turns can be squeezed into the space available, and (iv) the lens operating point covers a sufficient range of accelerating voltages.

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