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Search Results: 1 - 10 of 4970 matches for " Hysteresis Loss "
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Magnetic Hysteresis and Complex Initial Permeability of Cr3+ Substituted Mn-Zn Ferrites  [PDF]
F. Alam, M. L. Rahman, M. H. R. Khan, A. K. M. Akther Hossain
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.514122
Abstract:

The impact of Cr3+ ion on the magnetic properties of Mn0.50Zn0.50CrxFe2-xO4 (with x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) has been studied. Ferrite samples were synthesized by combustion method and sintered at various temperatures (1250°C, 1300°C and 1350°C). The structural properties were investigated by means of X-ray diffraction patterns and indicated that the samples possess single phase cubic spinel structure. The lattice parameter decreases with the increase in Cr3+ content, as the ionic radius of Cr3+ ion is smaller than that of Fe3+. The average grain size (D), bulk density (ρB) and initial permeability μidecreases with increase

Optimization of Power Transformer Design: Losses, Voltage Regulation and Tests  [PDF]
McPharlen Chipekwe Mgunda
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.52004
Abstract: This paper presents the design approach used in designing transformers mostly used in power supplies and power systems. The paper will cover theoretical principles applied in analyzing magnetic circuits to better understand the operation of the transformer. Since well-designed transformer is supposed to meet the specifications of the environment that it is going to be used, there is a need to confirm after the transformer is built to make sure that it is going to operate efficiently and without a failure. Therefore, this paper will also present the traditional methods used to test transformers in the industries to make sure that it will operate within the prescribed loading limits and voltages. This paper will cover the transformer losses in detail including the test methods used to calculate nameplate parameters for power transformers used in power systems.
Effect of R substitution on magnetic properties and magnetocaloric effects of La1-xRxFe11.5Si1.5 compounds with R=Ce, Pr and Nd

Shen Jun,Li Yang-Xian,Sun Ji-Rong,Shen Bao-Gen,

中国物理 B , 2009,
Abstract: Magnetic properties and magnetocaloric effects of La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$ ($R$=Pr, ($0 \le x \le 0.5$); $R$ = Ce and Nd, ($0 \le x \le 0.3$)) compounds are investigated. Partially replacing La with $R$ = Ce, Pr and Nd in La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$ leads to a reduction in Curie temperature due to the lattice contraction. The substitution of $R$ for La causes an enhancement in field-induced itinerant electron metamagnetic transition, which leads to a remarkable increase in magnetic entropy change $\Delta S_{\rm m}$ and also in hysteresis loss. However, a high effective refrigerant capacity $RC_{\rm eff}$ is still maintained in La$_{1 - x}R_{x}$Fe$_{11.5}$Si$_{1.5}$. In the present samples, a large $\Delta S_{\rm m}$ and a high $RC_{\rm eff}$ have been achieved simultaneously.
On the KdV Equation with Hysteresis  [PDF]
Marius-Florinel Ionescu, Ligia Munteanu, Veturia Chiroiu
World Journal of Mechanics (WJM) , 2011, DOI: 10.4236/wjm.2011.11001
Abstract: This paper discusses the generalized play hysteresis operator in connection with the KdV equation. Results from the nonlinear semigroup theory are applied to assure the existence and uniqueness. The KdV equation with hysteresis is reduced to a system of differential inclusions and solved.
Application Potential of Nanocrystalline Ribbons Still Pending
Pavol Butvin, Beata Butvinová, Peter vec, Jozef Sitek
Journal of Electrical Engineering , 2010, DOI: 10.2478/v10187-010-0038-z
Abstract: Nanocrystalline soft-magnetic ribbons promised a wide-spread practical use when introduced at the beginning of nineties. After 20 years of extensive research there are still unclear material problems which are thought to be the principal reason why these materials show but marginal use. Poorly controllable magnetic anisotropy due to spontaneous intrinsic macroscopic stress that comes from an inevitable heterogeneity of the ribbon materials is pointed to in this work. Certain stress-based mechanisms are shown to induce the unintended anisotropy in the already familiar Finemets as well as in the newer Hitperms. Hysteresis loops, domain structure and power loss is used to reveal the anisotropy consequences and particular connected but still unanswered questions are pinpointed.
Modelling the electromagnetic behaviour of sife alloys using the Preisach theory and the principle of loss seperation
Dupré L.,Van Keer R.,Melkebeek J.
Mathematical Problems in Engineering , 2001,
Abstract: In this paper we present 2 simplified methods for the evaluation of magnetisation loops in laminated SiFe alloys, using the Preisach theory and the statistical loss theory. These methods are investigated in detail as a practical alternative for a very accurate, but much involved numerical approach, viz a combined lamination model – dynamic Preisach model earlier developed by the authors. Particularly, one of the 2 methods provides accurate results inspite of a dramatic reduction of the CPU-time in comparison with the earlier developed combined model. For the other simplified method, the reduction of CPU-time is less pronounced but still considerable and the results are fairly good.
Modeling of Piezoelectric Actuators Based on a New Rate-Independent Hysteresis Model  [PDF]
Jingyang Peng, Xiongbiao Chen
Modern Mechanical Engineering (MME) , 2011, DOI: 10.4236/mme.2011.12004
Abstract: Accurate model representatives of piezoelectric actuators (PEAs) are important for both understanding the dynamic behaviors of PEAs and control scheme development. However, among the existing models, the most widely used classical Preisach hysteresis model are incapable of representing the commonly-encountered one-sided (non-negative voltage input range) hysteresis behaviors of PEAs. To solve this problem, a new rate-independent hysteresis model was developed for the one-sided hysteresis and then integrated with the models representative of creep and dynamics to form a single model for the PEAs. Experiments were carried out to validate the developed models.
The Static Characteristic Loop and the External Demagnetizing Factor  [PDF]
J. Takacs, Gy. Kovacs, L. K. Varga
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.310100
Abstract: In this paper we demonstrate, that shearing is changing only one parameter of the static loop. By using the shearing factor Ns, linked to the widely used, demagnetization coefficient ND, we show the one parameter link between the static unsheared and that of the sheared saturation loop, obtained by a non-toroidal, open circuit hysteresis measurement. The paper illustrates the simple relation between open circuit loop data and measured real static saturation data. The proposed theory is illustrated by using the hyperbolic model. For experimental illustration, tests results are used, which were carried out on two closed and open toroidal samples, made of NO Fe-Si electrical steel sheet, mimicking the demagnetization effect of the open circuit VSM measurement. These are both theoretical and experimental demonstrations, that shearing only changes the inclination of the static hysteresis loop. These test results, presented here, agree very well with the calculated results, based on the proposed method.
Rerouting Schemes for Wireless ATM Networks  [PDF]
Hasan Harasis
Communications and Network (CN) , 2014, DOI: 10.4236/cn.2014.64024
Abstract:

In this paper, the Wireless ATM rerouting procedures are analyzed and categorized, based on a standard network topology, derived from the Wireless ATM reference model. A new operational concept for a mobile ATM network called Mobile Network Architecture based on Virtual Paths (MNAVP), in which the network nodes are connected to each other via pre-established permanent virtual path connections with fixed capacity assignments is being proposed and described. Finally, the handover hysteresis concept is introduced and a hysteresis gain is defined and calculated as the factor by which the handover rate is reduced through the use of the hysteresis.

Baseball Catching Patterns Differ According to Task Constraints  [PDF]
Daiki Murase, Keiko Yokoyama, Keisuke Fujii, Yumiko Hasegawa, Yuji Yamamoto
Advances in Physical Education (APE) , 2016, DOI: 10.4236/ape.2016.63017
Abstract: We investigated the effect of task constraints on movement patterns and sought to confirm the finding that the combined movement involved in the transition between catching and throwing emerges through self-organization. We conducted two experiments. In Experiment 1, four participants were required to perform two tasks: catch a launched baseball (catching task) and catch the launched baseball and immediately throw it to a target (catching and throwing task). The balls were launched from five spatial positions, and the participants were instructed to catch the balls with their left hand using a baseball glove. We found that the catching movement differed according to the task and spatial constraints. When the ball was launched close to the body in the catching and throwing task, the shoulder and hip segment angles rotated in the direction of the throw, which resulted in combining the terminal phase of catching with the preparatory phase of throwing. In Experiment 2, two participants were asked to complete the catching and throwing task using the same procedure as in Experiment 1, to investigate the sequence effect. Our findings showed that the spatial position at which the trunk rotation switched direction, that is, hysteresis, differed according to the sequence of positions, suggesting that the combination of two movement patterns, such as catching and throwing, emerged through self-organization.
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