Algorithmic Approach for Slot Filling Factors Determination in Electrical Machines

2018 ◽  
Author(s):  
Massimo Caruso ◽  
Antonino Oscar Di Tommaso ◽  
Rosario Miceli ◽  
Claudio Nevoloso
Keyword(s):  
Electrical Machines ◽  
Algorithmic Approach ◽  
Slot Filling

scholarly journals Enhanced Flexible Algorithm for the Optimization of Slot Filling Factors in Electrical Machines

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1041 ◽  
Author(s):  
Armin Dietz ◽  
Antonino Oscar Di Tommaso ◽  
Fabrizio Marignetti ◽  
Rosario Miceli ◽  
Claudio Nevoloso
Keyword(s):  
Filling Factor ◽  
Industrial Sector ◽  
Electrical Machines ◽  
Manufacturing Processes ◽  
Electrical Machine ◽  
High Power Density ◽  
Design Phase ◽  
Algorithmic Approach ◽  
Accurate Design ◽  
Slot Filling

The continuous development in the field of industrial automation and electric mobility has led to the need for more efficient electrical machines with a high power density. The improvement of electrical machines’ slot filling factors is one of the measures to satisfy these requirements. In recent years, this topic has aroused greater interest in the industrial sector, since the evolution of the winding technological manufacturing processes allows an economically sustainable realization of ordered winding arrangements, rather than random ones. Moreover, the manufacture of electrical machines’ windings must be preceded by an accurate design phase in which it is possible to evaluate the maximum slot filling factor obtainable for a given wire shape and for its dimensions. For this purpose, this paper presents an algorithmic approach for the evaluation of maximum slot filling factors in electrical machines under an ideal geometric premise. In particular, this algorithm has a greater degree of flexibility with respect to the algorithm approaches found in the literature, since the study has been extended to round, rectangular and hexagonal wire sections. Furthermore, the slot filling factor calculation was carried out both for standard and non-standard slots. The algorithmic approach proposed can be considered as an additional useful tool for the fast design of electrical machine windings.

scholarly journals Enhanced Flexible Algorithm for the Optimization of Slot Filling Factors in Electrical Machines

2020 ◽  
Author(s):  
Antonino Oscar Di Tommaso ◽  
Armin Dietz ◽  
Claudio Nevoloso ◽  
Rosario Miceli ◽  
Fabrizio Marignetti
Keyword(s):  
Filling Factor ◽  
Industrial Sector ◽  
Electrical Machines ◽  
Manufacturing Processes ◽  
Electrical Machine ◽  
High Power Density ◽  
Design Phase ◽  
Algorithmic Approach ◽  
Accurate Design ◽  
Slot Filling

The continuous development in the field of industrial automation and electric mobility has led to the need for more efficient electrical machines with high power density. The improvement of electrical machines slot filling factors is one of the measures to satisfy these requirements. In recent years, this topic has aroused greater interest in the industrial sector, since the evolution of the winding technological manufacturing processes allows an economically sustainable realization of ordered winding arrangements, rather than random ones. Moreover, the manufacture of electrical machines windings must be preceded by an accurate design phase in which it is possible to evaluate the maximum slot filling factor obtainable for a given wire shape and for its dimensions. For this purpose, this paper presents an algorithmic approach for the evaluation of maximum slot filling factors in electrical machines under ideal geometric premise. In particular, this algorithm has a greater degree of flexibility with respect to the algorithm approaches found in the literature, since the study has been extended to round, rectangular and hexagonal wire sections. Furthermore, the slot filling factor calculation was carried out both for standard and non-standard slots. The algorithmic approach proposed can be considered as an additional useful tool for the fast design of electrical machine windings.

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.

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