Journal articles: 'Electrical excitation'

1

Pile, David. "Electrical excitation." Nature Photonics 7, no. 8 (July 30, 2013): 584. http://dx.doi.org/10.1038/nphoton.2013.200.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Nothaft, Maximilian, Steffen Höhla, Fedor Jelezko, Jens Pflaum, and Jörg Wrachtrup. "Single molecule electrical excitation." physica status solidi (b) 249, no. 4 (February 21, 2012): 653–60. http://dx.doi.org/10.1002/pssb.201100778.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Herasymenko, V., V. Pliuhin, and М. Shpika. "ANALYSIS OF CHARACTERISTICS OF ELECTRIC BRAKING SYSTEMS." Municipal economy of cities 1, no. 154 (April 3, 2020): 2–7. http://dx.doi.org/10.33042/2522-1809-2020-1-154-2-7.

Full text

Abstract:

The technical and energy characteristics of the most commonly used electrical braking systems are analyzed, their disadvantages are indicated. An electrical braking system with variable structure and DC motors with the best technical and energy performance is proposed. In the braking mode, the motors operate in series excitation, and the current in the excitation windings is controlled by a DC-DC converter. Keywords: electric motor, excitation windings, electrical braking, energy performance, high frequency converter.

APA, Harvard, Vancouver, ISO, and other styles

4

Laurent, Thibault, Yanko Todorov, Angela Vasanelli, Isabelle Sagnes, Grégoire Beaudoin, and Carlo Sirtori. "Electrical excitation of superradiant intersubband plasmons." Applied Physics Letters 107, no. 24 (December 14, 2015): 241112. http://dx.doi.org/10.1063/1.4937806.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Qin, Guang-rong, and Tatsuyuki Kawakubo. "Electrical Circuit Simulation of Membrane Excitation." Journal of the Physical Society of Japan 55, no. 10 (October 15, 1986): 3308–11. http://dx.doi.org/10.1143/jpsj.55.3308.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Kara, Dawid, Tomasz Kołacz, and Jerzy Skwarczyński. "Electrical machines with switched and modulated flux." Science, Technology and Innovation 8, no. 1 (April 7, 2020): 1–12. http://dx.doi.org/10.5604/01.3001.0013.8981.

Full text

Abstract:

The work compares the value of the produced torque (average value) of a 2.2kW squirrel cage induction motor with new construction machines, i.e. a motor with flux switching and hybrid excitation or DC excited, a motor with flux modulation and hybrid excitation or DC excitation. The external dimensions of the tested machines corresponded to the dimensions of the induction motor.

APA, Harvard, Vancouver, ISO, and other styles

7

Ali, Hassan, Erwan Sulaiman, Zamri Omar, M. F. Omar, Faisal Amin, and S. Khalidah Rahimi. "Preliminary Design Investigation of Dual Stator HE FSM using Segmental Rotor." International Journal of Engineering & Technology 7, no. 2.23 (April 20, 2018): 77. http://dx.doi.org/10.14419/ijet.v7i2.23.11888.

Full text

Abstract:

To drop the effect of air transportation on the atmosphere as well as to advance fuel productivity more-electric aircraft (MEA) architectures is a well-known approach. As the electrical machines are competent to deliver higher torque densities and are foremost for the viability of electrical driving force for aircraft applications. For these reasons a new category of machine has been familiar and published in last decade known as flux switching machine (FSM). FSMs comprises all excitation sources on stator side without winding robust rotor structure. Additionally, FSMs are classified into three types such as permanent magnet (PM) FSMs, field excitation (FE) FSMs and hybrid excitation (HE) FSMs. PM FSM and FE FSM use PM and FE coil for their excitation sources respectively, whereas both PM and FE coil are used in HE-FSM for excitation. Afterwards, HE FSMs have shown higher torque to weight ratios with higher efficiency during research in the last decade. Yet, in existing structures of HE FSMs, there is flux cancellation between the fluxes of PMs and FE coil which causes to reduce the performance of machines. Hence, in this paper, a novel structure of dual stator (DS) HE FSM with segmented rotor has been proposed and analyzed. The main reason of dual stator is to make the separate flow fluxes in HE machines to avoid cancellations. The proposed novel DS HE FSM has a simple structure using dual stators to endorse separate dual excitations to be used in fault conditions. The proposed structure has been analyzed using commercial 2D FEA package, JMAG-designer. Initially, this paper presents the coil test analysis of proposed DS HE FSM to confirm the working principle. Besides, performance analysis has been carried out at no load and load conditions.

APA, Harvard, Vancouver, ISO, and other styles

8

Irrera, A., D. Pacifici, M. Miritello, G. Franzò, F. Priolo, F. Iacona, D. Sanfilippo, G. Di Stefano, and P. G. Fallica. "Excitation and de-excitation properties of silicon quantum dots under electrical pumping." Applied Physics Letters 81, no. 10 (September 2, 2002): 1866–68. http://dx.doi.org/10.1063/1.1505117.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Jezernik, S., and M. Morari. "Energy-Optimal Electrical Excitation of Nerve Fibers." IEEE Transactions on Biomedical Engineering 52, no. 4 (April 2005): 740–43. http://dx.doi.org/10.1109/tbme.2005.844050.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Vasserman, I. N., V. P. Matveenko, I. N. Shardakov, and A. P. Shestakov. "Finite-element simulation of myocardial electrical excitation." Journal of Applied Mechanics and Technical Physics 55, no. 1 (January 2014): 61–67. http://dx.doi.org/10.1134/s0021894414010088.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Mitrea, Bogdan G., Bryan J. Caldwell, and Arkady M. Pertsov. "Imaging electrical excitation inside the myocardial wall." Biomedical Optics Express 2, no. 3 (February 16, 2011): 620. http://dx.doi.org/10.1364/boe.2.000620.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

White, M. "Cochlear prostheses: Stochastic model of electrical excitation." Journal of the Acoustical Society of America 77, S1 (April 1985): S81. http://dx.doi.org/10.1121/1.2022531.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Takasu, Nobuyuki, Yasunobu Handa, Yoshifusa Shimizu, and Takashi Yamada. "TSH-stimulated electrical excitation in thyroid cells." Biochemical and Biophysical Research Communications 129, no. 1 (May 1985): 275–79. http://dx.doi.org/10.1016/0006-291x(85)91433-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Fuzaro de Almeida, Estevão, Fábio Roberto Chavarette, and Douglas da Costa Ferreira. "POTÊNCIA GERADA EM UM SISTEMA DINÂMICO DECAPTAÇÃO DE ENERGIA CONTROLADO VIA MÉTODO LQR: COMPARAÇÃO ENTRE EXCITAÇÃO PERIÓDICA E NÃO-IDEAL." COLLOQUIUM EXACTARUM 12, no. 2 (September 20, 2020): 62–76. http://dx.doi.org/10.5747/ce.2020.v12.n2.e319.

Full text

Abstract:

Most of active control in vibrational dynamic systems is used to reduce vibrations. However,the aim of this research is specifically the use of vibrations to generate electrical energy, in such a way that the vibration becomes a desired phenomenon. In this way, the intention is to use the Optimal Control via Linear Quadratic Regulator (LQR), resulting in greater transduction of vibrational energy to electric power, varying the excitation type and performing an analysis of the stabilityand the effects of control to the dynamic system.The analyzed system is a bimodal mass-spring-damper with piezoelectric coupling-mechanic who suffers excitations periodic and non-ideal. This work intends to determine which system generates more electric power.

APA, Harvard, Vancouver, ISO, and other styles

15

Ojarand, Jaan, and Mart Min. "On the selection of excitation signals for the fast spectroscopy of electrical bioimpedance." Journal of Electrical Bioimpedance 9, no. 1 (December 31, 2018): 133–41. http://dx.doi.org/10.2478/joeb-2018-0018.

Full text

Abstract:

Abstract Different excitation signals are applicable in the wideband impedance spectroscopy in general. However, in electrical bioimpedance (EBI) measurements, there are limitations that set specific demands on the properties of the excitation signals. This paper compares the efficiency of different excitation signals in a graspable presentation and gives recommendations for their use. More exactly, the paper deals with finding the efficient excitation waveforms for the fast spectroscopy of electrical bioimpedance. Nevertheless, the described solutions could be useful also in other implementations of impedance spectroscopy intended for frequency domain characterization of different objects.

APA, Harvard, Vancouver, ISO, and other styles

16

Stamatellou, Antiopi-Malvina, and Anestis I. Kalfas. "On the Efficiency of a Piezoelectric Energy Harvester under Combined Aeroelastic and Base Excitation." Micromachines 12, no. 8 (August 14, 2021): 962. http://dx.doi.org/10.3390/mi12080962.

Full text

Abstract:

A flutter-type, nonlinear piezoelectric energy harvester was tested in various combinations of aerodynamic and harmonic base excitation to study its power output and efficiency. The commercial polyvinylidene fluoride film transducer LDT1-028K was used in 33 excitation mode. The aerodynamic excitation was created by a centrifugal fan and the base excitation by a cone speaker. The excitations were produced by varying independently the mean airflow velocity and the frequency of base vibration. A capacitive load was used to store the harvested energy. A line laser was employed along with long exposure photography and high-speed video, for the visualization of the piezo film’s mode shapes and the measurement of maximum tip deflection. The harvested power was mapped along with the maximum tip deflection of the piezo-film, and a process of optimally combining the two excitation sources for maximum power harvesting is demonstrated. The energy conversion efficiency is defined by means of electrical power output divided by the elastic strain energy rate of change during oscillations. The efficiency was mapped and correlated with resonance conditions and results from other studies. It was observed that the conversion efficiency is related to the phase difference between excitation and response and tends to decrease as the excitation frequency rises.

APA, Harvard, Vancouver, ISO, and other styles

17

Курсанов, А. Г., and A. G. Kursanov. "Функциональная неднородность возникающая в результате электрического и механического взаимодействия между кардиомиоцитами в математической модели однородного волокна." Mathematical Biology and Bioinformatics 10, no. 2 (November 16, 2015): 436–54. http://dx.doi.org/10.17537/2015.10.436.

Full text

Abstract:

We developed a mathematical model describing heart muscle strand as a one-dimensional continuous medium of cardiomyocytes, through which electrical excitation propagates and excites the cells for contraction. Intracellular excitation-contraction coupling is presented by means of our earlier published model describing mechanical function of the cardiomyocyte evoked by action potential development and calcium activation of cross-bridge formation. The whole strand model simulates also mechanical interaction between the cardiomyocytes in the tissue and accounts for both intracellular and intercellular electro-mechanical coupling and mechano-electric feedback mechanisms. Numerical experiments with the strand formed of initially identical cardiomyocytes revealed that electrical and mechanical interaction between the cells, as well as intracellular mechano-electric feedbacks caused pronounced nonuniformity of their behavior. Model analysis suggests that cooperative mechanisms of myofilament calcium activation play the key role in dynamic adjustment of electrical and mechanical activity of the interacting cardiomyocytes in the tissue.

APA, Harvard, Vancouver, ISO, and other styles

18

Nikolski, Vladimir P., Aleksandre T. Sambelashvili, and Igor R. Efimov. "Mechanisms of make and break excitation revisited: paradoxical break excitation during diastolic stimulation." American Journal of Physiology-Heart and Circulatory Physiology 282, no. 2 (February 1, 2002): H565—H575. http://dx.doi.org/10.1152/ajpheart.00544.2001.

Full text

Abstract:

10.1152/ajpheart.00544.2001. Onset and termination of electric stimulation may result in “make” and “break” excitation of the heart tissue. Wikswo et al. (30) explained both types of stimulations by virtual electrode polarization. Make excitation propagates from depolarized regions (virtual cathodes). Break excitation propagates from hyperpolarized regions (virtual anodes). However, these studies were limited to strong stimulus intensities. We examined excitation during weak near-threshold diastolic stimulation. We optically mapped electrical activity from a 4 × 4-mm area of epicardium of Langendorff-perfused rabbit hearts ( n = 12) around the pacing electrode in the presence ( n = 12) and absence ( n = 2) of 15 mM 2,3-butanedione monoxime. Anodal and cathodal 2-ms stimuli of various intensities were applied. We imaged an excitation wavefront with 528-μs resolution. We found that strong stimuli (×5 threshold) result in make excitation, starting from the virtual cathodes. In contrast, near-threshold stimulation resulted in break excitation, originating from the virtual anodes. Characteristic biphasic upstrokes in the virtual cathode area were observed. Break and make excitation represent two extreme cases of near-threshold and far-above-threshold stimulations, respectively. Both mechanisms are likely to contribute during intermediate clinically relevant strengths.

APA, Harvard, Vancouver, ISO, and other styles

19

Vlasenko, N. A. "Laser oscillation in Cr2+ :ZnS waveguide thin-film structures under electrical pumping with impact excitation mechanism." Semiconductor Physics Quantum Electronics and Optoelectronics 14, no. 3 (September 25, 2011): 339–43. http://dx.doi.org/10.15407/spqeo14.03.339.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Hill, Jacqueline, Seong-Ki Lee, Prattana Samasilp, and Corey Smith. "Pituitary adenylate cyclase-activating peptide enhances electrical coupling in the mouse adrenal medulla." American Journal of Physiology-Cell Physiology 303, no. 3 (August 1, 2012): C257—C266. http://dx.doi.org/10.1152/ajpcell.00119.2012.

Full text

Abstract:

Neuroendocrine adrenal medullary chromaffin cells receive synaptic excitation through the sympathetic splanchnic nerve to elicit catecholamine release into the circulation. Under basal sympathetic tone, splanchnic-released acetylcholine evokes chromaffin cells to fire action potentials, leading to synchronous phasic catecholamine release. Under elevated splanchnic firing, experienced under the sympathoadrenal stress response, chromaffin cells undergo desensitization to cholinergic excitation. Yet, stress evokes a persistent and elevated adrenal catecholamine release. This sustained stress-evoked release has been shown to depend on splanchnic release of a peptide transmitter, pituitary adenylate cyclase-activating peptide (PACAP). PACAP stimulates catecholamine release through a PKC-dependent pathway that is mechanistically independent of cholinergic excitation. Moreover, it has also been reported that shorter term phospho-regulation of existing gap junction channels acts to increase junctional conductance. In this study, we test if PACAP-mediated excitation upregulates cell-cell electrical coupling to enhance chromaffin cell excitability. We utilize electrophysiological recordings conducted in adrenal tissue slices to measure the effects of PACAP stimulation on cell coupling. We report that PACAP excitation increases electrical coupling and the spread of electrical excitation between adrenal chromaffin cells. Thus PACAP acts not only as a secretagogue but also evokes an electrical remodeling of the medulla, presumably to adapt to the organism's needs during acute sympathetic stress.

APA, Harvard, Vancouver, ISO, and other styles

21

Wang, Bing. "The Study on Dual Excitation Synchronous Permanent Magnets Synchronous Machines for Electrical Vehicle." Advanced Materials Research 490-495 (March 2012): 797–801. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.797.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

22

Franklin, Benjamin, and Sasilatha Sasilatha. "Power Supply for Excitation Mechanism of Motor in Electrical Appliance." Indonesian Journal of Electrical Engineering and Computer Science 9, no. 3 (March 1, 2018): 609. http://dx.doi.org/10.11591/ijeecs.v9.i3.pp609-612.

Full text

Abstract:

<p>In this paper, we propose another sort of brushless excitation system. Fueling the engine energizing twisting by remote power transmission (WPT) in light of attractively coupled reverberation can be a proficient approach to stay away from mechanical association of the rotor and the outer terminal, and accomplish brushless excitation advantageously and financially in a novel strategy. The constituent parts of this excitation instrument and the way they cooperate are presented. We additionally plan distinctive sorts of resonators for various excitation requests. The electromagnetic condition of this instrument is contemplated and some corroborative investigations are done, the outcomes uncover the viability.</p>

APA, Harvard, Vancouver, ISO, and other styles

23

Wang, Yu, Zhi Quan Deng, and Xiao Lin Wang. "A Novel 12/10 Electrical Excitation Flux-Switching Machine." Advanced Materials Research 383-390 (November 2011): 7306–11. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.7306.

Full text

Abstract:

A three phase, electrical excitation flux-switching (EEFS) brushless ac machine is proposed, its electromagnetic performance, viz., the phase flux-linkage and back-EMF waveforms, the torque density, the electromagnetic torque, and the torque-current characteristic, are evaluated based on finite element analysis. An EEFS machine exhibits sinusoidal flux-linkage and back-EMF waveforms. Compared with a hybrid excitation flux-switching (HEFS) machine, when de-excitation at fault is needed, the torque density of EEFS machine is ~20% larger than that of a HEFS machine with the same armature and field current copper loss.

APA, Harvard, Vancouver, ISO, and other styles

24

Liu, Haiping, and Dongmei Zhu. "Dynamics of a three-parameter electromagnetic vibration energy harvester considering electromechanical coupling." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 7 (December 11, 2019): 1323–39. http://dx.doi.org/10.1177/0954406219893386.

Full text

Abstract:

The paper concerns the dynamic responses and vibration energy harvesting characteristics in an electromagnetic vibration energy harvester comprising three-parameter mechanical vibration subsystem. For completeness and comparison, a two-parameter vibration energy harvester is also presented. The analytical expressions of the amplitude-frequency and phase-frequency responses of the inertial mass and the current in the electrical circuit are respectively derived by applying dimensionless method to the studied two- and three-parameter dynamic systems. Considering the effects of different types of ambient excitation, a single-frequency harmonic load and a periodic load are introduced into the analytical expressions on the dynamic performance of the vibration energy harvester. First of all, the influences of the designing parameters from the mechanical vibration subsystem and the electrical circuit subsystem on the vibration energy harvester are investigated. For evaluating the effects due to introducing the three-parameter mechanical vibration component, comparisons are made between two- and three-parameter vibration energy harvesters to convert the ambient excitations into electrical energy. And then, the expressions of the dimensionless average power which delivered into an electrical load under a single-frequency harmonic excitation or a periodic excitation are derived. The calculating results show that the energy conversion efficiency is enhanced significantly by changing the mechanical damping efficiency and the stiffness ratio for the three-parameter mechanical component of the energy harvester. At the same time, the average power of the three-parameter vibration energy harvester, which delivered into the electrical load, is also improved. However, the influences of the electrical circuit component on the ambient energy harvesting can be omitted when keeping the designing parameters of the mechanical part constant.

APA, Harvard, Vancouver, ISO, and other styles

25

IL’YASOV, Roman I., Dmitriy S. DEZHIN, and Irina N. DEZHINA. "A Superconducting Inductor Electrical Machine with Combined Excitation." Elektrichestvo 7, no. 7 (2019): 46–52. http://dx.doi.org/10.24160/0013-5380-2019-7-46-52.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Rattay, F. "Analysis of the electrical excitation of CNS neurons." IEEE Transactions on Biomedical Engineering 45, no. 6 (June 1998): 766–72. http://dx.doi.org/10.1109/10.678611.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Chatterjee, Monita, and Robert V. Shannon. "Forward masked excitation patterns in multielectrode electrical stimulation." Journal of the Acoustical Society of America 103, no. 5 (May 1998): 2565–72. http://dx.doi.org/10.1121/1.422777.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Shirane, Kotaro, Takayuki Tokimoto, Kozou Shinagawa, and Yoshiko Yamaguchi. "Ferroelectric diffused electrical bilayer model for membrane excitation." Ferroelectrics 141, no. 1 (March 1993): 297–305. http://dx.doi.org/10.1080/00150199308223457.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Zi Qiang Zhu, Zhong Ze Wu, David James Evans, and Wen Qiang Chu. "Novel Electrical Machines Having Separate PM Excitation Stator." IEEE Transactions on Magnetics 51, no. 4 (April 2015): 1–9. http://dx.doi.org/10.1109/tmag.2014.2358199.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Burton, M. J., J. M. Miller, and P. R. Kileny. "Middle-Latency Responses: I. Electrical and Acoustic Excitation." Archives of Otolaryngology - Head and Neck Surgery 115, no. 1 (January 1, 1989): 59–62. http://dx.doi.org/10.1001/archotol.1989.01860250061027.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Tierney, Heather L, Ashleigh E Baber, April D Jewell, Erin V Iski, Matthew B Boucher, and E. Charles H Sykes. "Mode-Selective Electrical Excitation of a Molecular Rotor." Chemistry - A European Journal 15, no. 38 (September 28, 2009): 9678–80. http://dx.doi.org/10.1002/chem.200902025.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Schiefer, M. A., and W. M. Grill. "Sites of Neuronal Excitation by Epiretinal Electrical Stimulation." IEEE Transactions on Neural Systems and Rehabilitation Engineering 14, no. 1 (March 2006): 5–13. http://dx.doi.org/10.1109/tnsre.2006.870488.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Ghosh, A. K., T. K. Munshi, and H. S. Chakravorty. "Electrical response of piezoelectric materials under mechanical excitation." Journal of Applied Physics 86, no. 10 (November 15, 1999): 5753–56. http://dx.doi.org/10.1063/1.371589.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Dehghani, Hamid, Nirmal Soni, Ryan Halter, Alex Hartov, and Keith D. Paulsen. "Excitation patterns in three-dimensional electrical impedance tomography." Physiological Measurement 26, no. 2 (March 30, 2005): S185—S197. http://dx.doi.org/10.1088/0967-3334/26/2/018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Gaudet, Rachelle, Benoit Roux, and Daniel L. MinorJr. "Insights into the molecular foundations of electrical excitation." Journal of Molecular Biology 427, no. 1 (January 2015): 1–2. http://dx.doi.org/10.1016/j.jmb.2014.12.006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Hussain, Sajid, and David Lowther. "The prediction of iron losses under PWM excitation using the classical Preisach model." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 35, no. 6 (November 7, 2016): 1996–2006. http://dx.doi.org/10.1108/compel-03-2016-0126.

Full text

Abstract:

Purpose The losses incurred in ferromagnetic materials under PWM excitations must be predicted accurately to optimize the design of modern electrical machines. The purpose of this paper is to employ mathematical hysteresis models (i.e. classical Preisach model) to predict iron losses in electrical steels under PWM excitation without compromising the computational complexity of the model. Design/methodology/approach In this paper, a novel approach based on the dynamic inverse Preisach model is proposed to model the iron losses. The PWM magnetic flux density waveform is decomposed into its harmonic component using Fourier series and a weighted Everett function is computed based on these harmonic components. The Preisach model is applied for the given flux waveform and results are validated against the measurements. Findings The paper predicts the total iron loss by computing a weighted Everett function based on the harmonics present in PWM waveform. Moreover, it formulates the possibility of utilizing the classical Preisach model to predict iron losses under PWM excitation. Research limitations/implications The approach is still limited in terms of its application at high frequencies. This work may eventually lead toward the accurate prediction of iron loss under PWM excitation in electromagnetic machine design. Practical implications The paper provides a simple approach applying the Preisach model for the prediction of iron losses under PWM excitation. The proposed approach does not require additional experimental data beyond B-H loops measured under sinusoidal excitation. Originality/value A novel approach is presented to incorporate the frequency dependence into a static inverse Preisach model. The approach extends the ability of the static Preisach model to compute total iron loss under PWM excitation using a weighted Everett function.

APA, Harvard, Vancouver, ISO, and other styles

37

Miyahara, Hideaki, and Kyyoul Yun. "Two-Dimensional AC Magnetic Properties of Electrical Steel Sheet with Two-Dimensional DC-Biased Magnetization." Materials Science Forum 1034 (June 15, 2021): 141–49. http://dx.doi.org/10.4028/www.scientific.net/msf.1034.141.

Full text

Abstract:

To estimate the magnetic properties with two-dimensional AC-magnetization with two-dimensional DC-biased magnetization, three different grades of non-oriented electrical steel sheets with two-dimensional DC-biased magnetization were prepared. As a result, in the high grade specimen, the difference in the magnetic properties depending on the excitation direction (AC excitation direction is parallel to DC excitation direction) was larger than in the low grade specimen, and the magnetic properties were the best when the excitation direction was the rolling direction. Non-oriented electrical steel sheets have small magnetic anisotropy. High grade non-oriented electrical steel sheets have a large magnetic anisotropy to compare with low grade non-oriented electrical steel sheets. It is thought that magnetic anisotropy increased in the high grade non-oriented electrical steel sheets because the B-H loops under DC-biased magnetization were minor loops. In addition, the increase rate of the H widths and the increase rate of the iron losses depending on the excitation direction were relatively consistent. Since the iron loss is proportional to the area of the B-H loop, it is considered that the iron loss increased at the same rate as the H width of the B-H loop.

APA, Harvard, Vancouver, ISO, and other styles

38

Kusák, Ivo, Miroslav Lunak, Maria Mikova, and Pavel Rovnaník. "Influence of Carbon Admixtures to the Electrical Conductivity of Slag Mortars." Solid State Phenomena 258 (December 2016): 465–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.465.

Full text

Abstract:

Applied research tries to offer new materials from the slag mortars. Basic research tries to explore these engineered materials from the perspective of all the possible test methods. Modern vector analyzer R&S ZNC with a coaxial probe DAK-12 from Speag company was used to determine permittivity and dielectric loss factor of the beams and interesting spectrums of electric resistance were measured for samples with varying content of carbon powder. Carbon contributes from the viewpoint of electrical properties, for example it improved antistatic properties of the floor. In addition to the vector analyzer – the simpler measuring unit was also used. In a frequency range of 40 Hz to 1 MHz values of electrical resistance and permittivity values of the beams with different content of graphite powder, labeled Cond 896 were determined. The higher content of graphite powder increases the electrical conductivity; building materials based on cement are becoming more measurable using electromagnetic measuring methods. The most striking change in the relative conductivity was observed at excitation frequency of the external electric field of 1 kHz. At high frequencies of electrical excitation field from 10 MHz to 3 GHz values of the real part of permittivity were determined by vector analyzer. These measurements are among the building materials used rarely and they open new possibilities of diagnostics.

APA, Harvard, Vancouver, ISO, and other styles

39

Geng, Huihui, Xueyi Zhang, Yufeng Zhang, Wenjing Hu, Yulong Lei, Xiaoming Xu, Aichuan Wang, Shanjian Wang, and Liwei Shi. "Development of Brushless Claw Pole Electrical Excitation and Combined Permanent Magnet Hybrid Excitation Generator for Vehicles." Energies 13, no. 18 (September 10, 2020): 4723. http://dx.doi.org/10.3390/en13184723.

Full text

Abstract:

Aiming at the problems of large excitation loss and low power generation efficiency of silicon rectifier generators and the unstable output voltage of permanent magnet (PM) generators, a hybrid excitation generator (HEG) with suspended brushless claw pole electrical excitation rotor (EER) and combined magnetic pole PM rotor is proposed in the present work. With only one fractional slot winding stator, the generator adopts PM field as the main magnetic field and electrical excitation field as the auxiliary magnetic field, which not only retains the advantages of high efficiency of PM generators but also effectively reduces excitation consumption. The main structure parameters and the design method were analyzed, and a simulation analysis of no-load magnetic field distribution and flux regulation ability was carried out using finite element software to verify the rationality of the hybrid excitation parallel magnetic circuit design. Moreover, the no-load, load, regulation, and voltage regulation characteristics of the designed generator were tested, and the results show that the designed generator has a wide range of voltage regulation, which can ensure stable output voltage under variable speed and load conditions.

APA, Harvard, Vancouver, ISO, and other styles

40

Smolik, Waldemar, Jacek Kryszyn, Tomasz Olszewski, and Roman Szabatin. "METHODS OF SMALL CAPACITANCE MEASUREMENT IN ELECTRICAL CAPACITANCE TOMOGRAPHY." Informatics Control Measurement in Economy and Environment Protection 7, no. 1 (March 30, 2017): 105–10. http://dx.doi.org/10.5604/01.3001.0010.4596.

Full text

Abstract:

The paper presents the main methods of small capacitance measurement used in electrical capacitance tomography: the AC method with a sine wave excitation and the charge-discharge method with square wave excitation. Construction of synchronous detector for both circuits was discussed. A modified "charge-discharge" method was presented.

APA, Harvard, Vancouver, ISO, and other styles

41

Deng, Zhangxian, and Marcelo J. Dapino. "Influence of electrical impedance and mechanical bistability on Galfenol-based unimorph harvesters." Journal of Intelligent Material Systems and Structures 28, no. 3 (October 1, 2016): 421–31. http://dx.doi.org/10.1177/1045389x16666176.

Full text

Abstract:

A study on iron-gallium (Galfenol) unimorph harvesters is presented which is focused on extending the power density and frequency bandwidth of these devices. A thickness ratio of 2 (ratio of substrate to Galfenol thickness) has been shown to achieve maximum power density under base excitation, but the effect of electrical load capacitance on performance has not been investigated. This article experimentally analyzes the influence of capacitive electrical loads and extends the excitation type to tip impulse. For resistive-capacitive electrical loads, the maximum energy conversion efficiency achieved under impulsive excitation is 5.93%, while the maximum output power and output power density observed for a 139.5 Hz, 3 [Formula: see text] amplitude sinusoidal base excitation is 0.45 W and 6.88 [Formula: see text], respectively, which are 8% higher than those measured under purely resistive loads. A finite element model for Galfenol unimorph harvesters, which incorporates magnetic, mechanical, and electrical dynamics, is developed and validated using impulsive responses. A buckled unimorph beam is experimentally investigated. The proposed bistable system is shown to extend the harvester’s frequency bandwidth.

APA, Harvard, Vancouver, ISO, and other styles

42

García-García, Amanda, Ricardo Vergaz, José Francisco Algorri, Xabier Quintana, and José Manuel Otón. "Electrical response of liquid crystal cells doped with multi-walled carbon nanotubes." Beilstein Journal of Nanotechnology 6 (February 6, 2015): 396–403. http://dx.doi.org/10.3762/bjnano.6.39.

Full text

Abstract:

The inclusion of nanoparticles modifies a number of fundamental properties of many materials. Doping of nanoparticles in self-organized materials such as liquid crystals may be of interest for the reciprocal interaction between the matrix and the nanoparticles. Elongated nanoparticles and nanotubes can be aligned and reoriented by the liquid crystal, inducing noticeable changes in their optical and electrical properties. In this work, cells of liquid crystal doped with high aspect ratio multi-walled carbon nanotubes have been prepared, and their characteristic impedance has been studied at different frequencies and excitation voltages. The results demonstrate alterations in the anisotropic conductivity of the samples with the applied electric field, which can be followed by monitoring the impedance evolution with the excitation voltage. Results are consistent with a possible electric contact between the coated substrates of the LC cell caused by the reorientation of the nanotubes. The reversibility of the doped system upon removal of the electric field is quite low.

APA, Harvard, Vancouver, ISO, and other styles

43

Li, Zhe, and Ling Zheng. "Integrated design of active suspension parameters for solving negative vibration effects of switched reluctance-in-wheel motor electrical vehicles based on multi-objective particle swarm optimization." Journal of Vibration and Control 25, no. 3 (August 12, 2018): 639–54. http://dx.doi.org/10.1177/1077546318791023.

Full text

Abstract:

As for the elastic layout of the direct-driven electric wheel system, the electromechanical coupling between the electromagnetic excitation of in-wheel driving motor and the weak damping system gives rise to negative vibration issues, which further deteriorate the dynamic performance of the electric vehicle. This paper presents a multi-objective optimization method for active suspension system to solve these issues by developing an integrated in-wheel motor electrical vehicles model. The unbalanced electromagnetic excitation from in-wheel driving motor is investigated by means of analytical and finite element methods. The Pareto solution set of optimal parameters are generated by the multi-objective particle swarm optimization method, and a comparison in vehicle dynamic performances is made to verify the targeted optimization method. The simulation results indicate that the optimized active suspension system attenuates the sensitivity of the vehicle system to electromagnetic excitation with a satisfactory balancing between vehicle ride comfort and stability as well as active suspension utilization.

APA, Harvard, Vancouver, ISO, and other styles

44

Manoj, K., V. Narayanamurthy, and S. Korla. "Performance of a Cantilever Energy Harvester under Harmonic and Random Excitations." Defence Science Journal 71, no. 2 (March 10, 2021): 231–40. http://dx.doi.org/10.14429/dsj.71.15772.

Full text

Abstract:

The technique of harvesting the energy from base structural vibration through a piezoelectric transducer attached at an appropriate location on the vibrating structure is gaining popularity in recent years. Although the amount of energy harvested depends on the type and magnitude of base excitation, the energy harvest under random excitation as compared to equivalent harmonic excitations is not yet well understood and is investigated in this paper through a cantilever energy harvester. Initially, the energy harvested under harmonic excitations is numerically simulated and experimentally validated under increasing base accelerations with different load resistances. Subsequently, the performance of this energy harvester is experimentally studied under random excitations. The results demonstrate that the harvested energy (a) reaches maximum value when the base excitation matches the natural frequency of the harvester, (b) increases with the increase in base accelerations irrespective of the type of excitation, and (c) increases by 2-14 times under random excitations as compared to equivalent harmonic excitations i.e. under same energy input. It is recommended that the energy harvester be used in aerospace structures where random vibration amplitude is higher, to harvest more energy.

APA, Harvard, Vancouver, ISO, and other styles

45

Zuščak, Jozef, Vladimír Kujan, and František Janíček. "Simulations and measurements on a self-excited induction generator." Journal of Electrical Engineering 69, no. 5 (September 1, 2018): 359–65. http://dx.doi.org/10.2478/jee-2018-0052.

Full text

Abstract:

Abstract Paper deals with the use of an induction machine in the role of a generator. Such an operational mode is called a self-excited induction generator SEIG. It does not require an external power source to create the excitation field, as is the case with traditional synchronous generators. Therefore, it is widely used in power plants with renewable energy as a primary source (wind, water, etc). However, in terms of possible regulation and control of the electrical properties, the excitation process is extremely important. A mathematical model and simulation in Matlab are introduced. The excitation process was experimentally investigated in the laboratory of electric drives and the results are correlated with the expectations.

APA, Harvard, Vancouver, ISO, and other styles

46

Chouaba, Seif Eddine, and Abdallah Barakat. "Advanced Brushless Excitation System with Dynamic De-Excitation Capability." International Review of Electrical Engineering (IREE) 14, no. 2 (April 30, 2019): 97. http://dx.doi.org/10.15866/iree.v14i2.16367.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Lapeikaite, Indre, Vilmantas Pupkis, Vladas Neniskis, Osvaldas Ruksenas, and Vilma Kisnieriene. "Glutamate and NMDA affect cell excitability and action potential dynamics of single cell of macrophyte Nitellopsis obtusa." Functional Plant Biology 47, no. 12 (2020): 1032. http://dx.doi.org/10.1071/fp20074.

Full text

Abstract:

The effect of glutamate and N-methyl-d-aspartate (NMDA) on electrical signalling – action potentials (AP) and excitation current transients – was studied in intact macrophyte Nitellopsis obtusa (Characeaen) internodal cell. Intracellular glass electrode recordings of single cell in current clamp and two-electrode voltage clamp modes indicate that glutamate (Glu, 0.1–1.0 mM) and NMDA (0.01–1.0 mM) increase electrically induced AP amplitude by hyperpolarising excitation threshold potential (Eth) and prolong AP fast repolarisation phase. Amplitude of Cl– current transient, as well as its activation and inactivation durations were also increased. Both Glu and NMDA act in a dose-dependent manner. The effect of NMDA exceeds that of Glu. Ionotropic glutamate receptor inhibitors AP-5 (NMDA-type receptors) and DNQX (AMPA/Kainate-type) have no effect on Nitellopsis cell electrical signalling per se, yet robustly inhibit excitatory effect of NMDA. This study reinforces NMDA as an active component in glutamatergic signalling at least in some plants and stresses the elaborate fine-tuning of electrical signalling.

APA, Harvard, Vancouver, ISO, and other styles

48

Oka, Mohachiro, Masato Enokizono, Yuji Mori, and Kazumasa Yamazaki. "Building Factor Evaluation of the Stator Core Made of Ultrathin Electrical Steel Sheet for the High-Speed Motor." Materials Science Forum 915 (March 2018): 9–15. http://dx.doi.org/10.4028/www.scientific.net/msf.915.9.

Full text

Abstract:

We are developing a low-loss stator core for high-speed and small-size motors using an ultrathin electrical steel sheet. This stator core for a high-speed motor was produced using a 0.08mm-thick ultrathin electrical steel sheet. Additionally, in order to evaluate the iron loss of the high-speed motor stator core, we constructed a high-speed building factor evaluation system. This evaluation system is composed of high-speed A/D converters, a D/A converter, and a high-speed power amplifier. TheB-Hcurve and the iron loss of the high-speed motor stator core (0.08mm_Core), which was made of the 0.08mm-thick ultrathin electrical steel sheet, were measured using the outer excitation method and the high-speed building factor evaluation system. The iron loss of the 0.08mm_Core was about 66% of the iron loss of the ordinary-speed motor stator core (the 0.35mm_Core) which was made of a 0.35mm-thick electrical steel sheet. Each iron loss in two kinds of cores was measured using the outer excitation method at the excitation frequency (fex) 1000Hz and the maximum excitation magnetic flux density (Bexmax) 1.0T. From experimental results, the iron loss of the 0.08mm_Core in the high frequency excitation was very small.

APA, Harvard, Vancouver, ISO, and other styles

49

Al-Badi, Abdullah, Adel Gastli, Hadj Bourdoucen, and Joseph Jervase. "Evolution of Axial-Field Electrical Machines." Sultan Qaboos University Journal for Science [SQUJS] 5 (December 1, 2000): 227. http://dx.doi.org/10.24200/squjs.vol5iss0pp227-245.

Full text

Abstract:

This paper is a review of axial-field electrical machines, which were at the origin of the invention of electrical machines such as the famous Faraday’s disk. The different configurations of the axial-field machines are presented along with their advantageous key steady state characteristics such as high efficiency and high power to weight ratio. The differences between axial-field machines and conventional radial-field machines are discussed. The disc-type axial-field electrical machines with permanent-magnet excitation seem to be among the best designs in terms of compactness, suitable shape, robustness, and electric characteristics. Axial-field machines are expected to be used in a large number of applications in the future owing to their special features and distinct advantages compared to conventional radial-field machines.

APA, Harvard, Vancouver, ISO, and other styles

50

Stewart, G., E. Rubin, and A. P. Thomas. "Inhibition by cocaine of excitation-contraction coupling in isolated cardiomyocytes." American Journal of Physiology-Heart and Circulatory Physiology 260, no. 1 (January 1, 1991): H50—H57. http://dx.doi.org/10.1152/ajpheart.1991.260.1.h50.

Full text

Abstract:

The effects of cocaine on the Ca2+ fluxes responsible for excitation-contraction coupling were studied in isolated ventricular rat heart cells loaded with the fluorescent Ca2+ indicator fura-2. Ca2+ transients in response to electrical field stimulation were followed using a fluorescence ratio method in which excitation light was alternated with 5-ms resolution. The cardiomyocytes maintained a basal cytosolic Ca2+ concentration of approximately 70 nM, which increased to a peak of 450 nM in response to each electrical stimulus. The addition of cocaine (10 microM) to cells stimulated at 0.4 Hz decreased the magnitude of the electrically induced Ca2+ transients by 30 +/- 4% within 5 s. This inhibitory effect of cocaine was dose dependent, with a 50% reduction in the Ca2+ transient occurring at 40 microM cocaine. The effects of cocaine were not associated with any permanent cell damage and could be reversed by washing the cells free of the drug. Cytosolic Ca2+ increases in response to K(+)-induced depolarization of the cardiomyocytes were much less sensitive to cocaine than the electrically induced Ca2+ transients. In this respect the effects of cocaine were similar to the actions of lidocaine and tetrodotoxin but distinct from the effects of nitrendipine and verapamil. Cocaine had no effect on the caffeine-releasable Ca2+ pool in cardiomyocytes. These data demonstrate that cocaine directly inhibits the Ca2(+)-dependent steps of excitation-contraction coupling in heart muscle cells. Sarcolemmal Na+ channels represent a possible locus for this action of cocaine.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Electrical excitation'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles