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Journal articles on the topic 'Homopolar generators'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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1

McNab, I. R. "Homopolar generators for electric guns." IEEE Transactions on Magnetics 33, no. 1 (1997): 461–67. http://dx.doi.org/10.1109/20.560056.

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2

Perkins, D., K. Nalty, and W. Walls. "Self excitation of iron core homopolar generators." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1653–57. http://dx.doi.org/10.1109/tmag.1986.1064671.

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3

Bostick, W. H. "The Hubble expansion as ascribed to mutual magnetic induction between neighboring galaxies." Laser and Particle Beams 6, no. 3 (August 1988): 405–8. http://dx.doi.org/10.1017/s0263034600005346.

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A 32-year-old hypothesis of the formation of barred-spiral galaxies (Bostick 1957, 1958, 1986; Laurence, 1956) which become coherent-self-exciting homopolar generators has recently gained confirmative support from 3-D, particle-in-cell computer simulations (Nielsen et al. 1979; Buneman et al. 1980; Peratt et al. 1980, 1984, 1986). Such galaxies should be able to convert an appreciable fraction, f, of the energy from their gravitationally-collapsing plasmas to coherently-increasing magnetic energy via their coherent, self-exciting, homopolar-generator action. The following simple calculation shows that the resulting mutually-induced magnetic repulsions (Len's law) between neighboring galaxies is greater than the gravitational attractive forces between the galaxies. The observed expansion of the Universe can be thus simply accounted for without recourse to the ‘Big Bang’ hypothesis, with its unaccounted-for mysteries.
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4

Engel, Thomas G., and Evan A. Kontras. "Modeling and Analysis of Homopolar Motors and Generators." IEEE Transactions on Plasma Science 43, no. 5 (May 2015): 1381–86. http://dx.doi.org/10.1109/tps.2015.2405531.

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5

Kalsi, Swarn, Kent Hamilton, Robert Buckley, and Rodney Badcock. "Superconducting AC Homopolar Machines for High-Speed Applications." Energies 12, no. 1 (December 28, 2018): 86. http://dx.doi.org/10.3390/en12010086.

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This paper presents a novel high-speed alternating current (AC) homopolar motor/generator design using stationary ReBCO excitation windings. Compact, lightweight, high-efficiency motors and generators are sought for a multitude of applications. AC homopolar synchronous machines are an ideal choice for such applications as these machines enable very high rotational frequencies. These machines include both AC armature winding and direct current (DC) excitation winding within the stationary part of the machine. The stationary excitation winding magnetizes a solid steel rotor, enabling operating speeds limited only by the mechanical stress limit of the rotor steel. The operating speeds are many multiples of conventional power 50/60 Hz machines. Significant cooling requirements limit machines of this type utilizing copper excitation windings to only a few kilowatts. However, megawatt ratings become possible when superconductor coils are used. This paper describes the design and analysis of an AC homopolar machine in the context of developing a 500 kW flywheel system to be used for energy recovery and storage in commuter rail subway systems. Different approaches are discussed for an AC armature employing conventional copper coils. Challenges of building and cooling both armature and field coils are discussed and preferred approaches are suggested. Calculations of the machine performance are then made.
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6

Makel, D. "Thermal design and development of actively cooled brushes for compact homopolar generators." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1603–8. http://dx.doi.org/10.1109/tmag.1986.1064691.

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7

Dmitrievskii, Vladimir, Vladimir Prakht, Alecksey Anuchin, and Vadim Kazakbaev. "Design Optimization of a Traction Synchronous Homopolar Motor." Mathematics 9, no. 12 (June 11, 2021): 1352. http://dx.doi.org/10.3390/math9121352.

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Synchronous homopolar motors (SHMs) have been attracting the attention of researchers for many decades. They are used in a variety of equipment such as aircraft and train generators, welding inverters, and as traction motors. Various mathematical models of SHMs have been proposed to deal with their complicated magnetic circuit. However, mathematical techniques for optimizing SHMs have not yet been proposed. This paper discusses various aspects of the optimal design of traction SHMs, applying the one-criterion unconstrained Nelder–Mead method. The considered motor is intended for use in a mining dump truck with a carrying capacity of 90 tons. The objective function for the SHM optimization was designed to reduce/improve the following main characteristics: total motor power loss, maximum winding current, and torque ripple. One of the difficulties in optimizing SHMs is the three-dimensional structure of their magnetic core, which usually requires the use of a three-dimensional finite element model. However, in this study, an original two-dimensional finite element model of a SHM was used; it allowed the drastic reduction in the computational burden, enabling objective optimization. As a result of optimization, the total losses in the motor decreased by up to 1.16 times and the torque ripple decreased by up to 1.34 times; the maximum armature winding current in the motor mode decreased by 8%.
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8

Dmitrievskii, Vladimir, Vladimir Prakht, and Vadim Kazakbaev. "Design Optimization of a Synchronous Homopolar Motor with Ferrite Magnets for Subway Train." Mathematics 11, no. 3 (January 22, 2023): 589. http://dx.doi.org/10.3390/math11030589.

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Brushless synchronous homopolar machines (SHM) have long been used as highly reliable motors and generators with an excitation winding on the stator. However, a significant disadvantage that limits their use in traction applications is the reduced specific torque due to the incomplete use of the rotor surface. One possible way to improve the torque density of SHMs is to add inexpensive ferrite magnets in the rotor slots. This paper presents the results of optimizing the performances of an SHM with ferrite magnets for a subway train, considering the timing diagram of train movement. A comparison of its characteristics with an SHM without permanent magnets is also presented. When using the SHM with ferrite magnets, a significant reduction in the dimensions and weight of the motor, as well as power loss, is shown.
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9

Appleton, A. D. "Superconducting Marine Propulsion Power." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 206, no. 2 (May 1992): 73–82. http://dx.doi.org/10.1243/pime_proc_1992_206_014_02.

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Over the last 25 years a large amount of research and development has been undertaken on the application of superconductors to marine propulsion systems and a number of superconducting homopolar motors and generators were constructed between the mid 1960s and the early 1980s. The paper reviews this work and shows that the technology had almost reached the point where industrial exploitation could have commenced. The reason why these machines did not reach the market place is discussed together with the impact which the recently discovered higher temperature superconductors may have upon future developments. Reference is made to a new ship which has been constructed in Japan and which derives its thrust directly from electrical energy using superconducting magnets in an engine based upon magnetohydrodynamics (MHD). With the exception of the MHD ship and the programme in the United States all of the work on d.c. machines described in this paper has been carried out by or under the direction of the author.
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10

Wu, A. Y., and K. S. Sun. "Formulation and implementation of the current filament method for the analysis of current diffusion and heating in conductors in railguns and homopolar generators." IEEE Transactions on Magnetics 25, no. 1 (1989): 610–15. http://dx.doi.org/10.1109/20.22610.

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11

Guo, Ning, Ruixiao Meng, Junguo Gao, Mingpeng He, Yue Zhang, Lizhi He, and Haitao Hu. "Properties and Simulating Research of Epoxy Resin/Micron-SiC/Nano-SiO2 Composite." Energies 15, no. 13 (July 1, 2022): 4821. http://dx.doi.org/10.3390/en15134821.

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The dielectric behavior of insulations is a key factor affecting the development of anti-corona materials for generators. Epoxy resin (EP), as the matrix, is blended with inorganic fillers of micron SiC and nano SiO2 to investigate the effect of micro and nano doping on the conductivity and breakdown mechanism of the composites. Using experimental and simulation analysis, it is found that the effect of nano-SiO2 doping concentration on the conductivity is related to the dispersion of SiC particles. The lower concentration of SiO2 could decrease the conductivity of the composites. The conductivity increases with raising the nano-SiO2 doping concentration to a critical value. Meanwhile, the breakdown field strength of the composites decreases with the rising content of SiC in constant SiO2 and increases with more SiO2 when mixed with invariable SiC. When an equivalent electric field is applied to the samples, the electric field at the interface of micron particles is much stronger than the average field of the dielectric, close to the critical electric field of the tunneling effect. The density of the homopolar space charge bound to the surface of the stator bar elevates as the concentration of filled nanoparticles increases, by which a more effective Coulomb potential shield can be built to inhibit the further injection of carriers from the electrode to the interior of the anti-corona layer, thus reducing the space charge accumulation in the anti-corona layer as well as increasing the breakdown field strength of the dielectric.
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12

Gully, J. H., D. J. Hildenbrand, and W. F. Weldon. "Balcones homopolar generator power supply." IEEE Transactions on Magnetics 25, no. 1 (1989): 210–18. http://dx.doi.org/10.1109/20.22536.

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13

Price, J., J. Gully, and M. Driga. "The high voltage homopolar generator." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1690–94. http://dx.doi.org/10.1109/tmag.1986.1064694.

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14

Walls, W., Wm Weldon, M. Driga, S. Manifold, H. Woodson, and J. Gully. "Improved energy density homopolar generator." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1793–98. http://dx.doi.org/10.1109/tmag.1986.1064734.

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15

McKee, B., and I. McNab. "A 10-MJ compact homopolar generator." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1619–22. http://dx.doi.org/10.1109/tmag.1986.1064674.

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16

Eagleton, R. D. "Two laboratory experiments involving the homopolar generator." American Journal of Physics 55, no. 7 (July 1987): 621–23. http://dx.doi.org/10.1119/1.15076.

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17

Zengel, Keith. "The handheld and hand-powered homopolar generator." Physics Teacher 56, no. 1 (January 2018): 61. http://dx.doi.org/10.1119/1.5018701.

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18

Baker, N., B. McKee, and I. McNab. "Design of a 40 megawatt homopolar generator." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1386–88. http://dx.doi.org/10.1109/tmag.1986.1064641.

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19

Headifen, G. R., J. A. Pappas, J. M. Weldon, J. C. Wright, J. H. Price, J. H. Gully, and G. Brunson. "Preliminary design of a 1 gigajoule homopolar generator." IEEE Transactions on Magnetics 29, no. 1 (January 1993): 980–85. http://dx.doi.org/10.1109/20.195712.

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20

Fuger, Rene, Arkadiy Matsekh, John Kells, D. B. T. Sercombe, and Ante Guina. "A superconducting homopolar motor and generator—new approaches." Superconductor Science and Technology 29, no. 3 (January 21, 2016): 034001. http://dx.doi.org/10.1088/0953-2048/29/3/034001.

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21

Tajmar, M. "Homopolar artificial gravity generator based on frame-dragging." Acta Astronautica 66, no. 9-10 (May 2010): 1297–301. http://dx.doi.org/10.1016/j.actaastro.2009.10.022.

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22

Johnson, E., and W. Chen. "Superconducting field coil for high-voltage homopolar generator." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1558–60. http://dx.doi.org/10.1109/tmag.1986.1064738.

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23

Hazelton, D. W., M. T. Gardner, J. A. Rice, M. S. Walker, C. M. Trautwein, P. Haldar, D. U. Gubser, M. Superczynski, and D. Waltman. "HTS coils for the Navy's superconducting homopolar motor/generator." IEEE Transactions on Appiled Superconductivity 7, no. 2 (June 1997): 664–67. http://dx.doi.org/10.1109/77.614591.

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24

Chyba, Christopher F., Kevin P. Hand, and Paul J. Thomas. "Energy conservation and Poynting's theorem in the homopolar generator." American Journal of Physics 83, no. 1 (January 2015): 72–75. http://dx.doi.org/10.1119/1.4895389.

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25

Barmada, S., A. Musolino, M. Raugi, and R. Rizzo. "Analysis of a homopolar disk generator via equivalent network." IEEE Transactions on Magnetics 39, no. 1 (January 2003): 125–28. http://dx.doi.org/10.1109/tmag.2002.805870.

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26

ITOH, Yasuyuki. "High Pressure Gas Driven Liquid Metal MHD Homopolar Generator." Journal of Nuclear Science and Technology 25, no. 1 (January 1988): 1–7. http://dx.doi.org/10.1080/18811248.1988.9733550.

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27

YAMAGUCHI, Mitsugi. "Applied Superconductivity Technologies Succeeding to the 21st Century. Homopolar generator." TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 36, no. 8 (2001): 461–69. http://dx.doi.org/10.2221/jcsj.36.461.

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28

Mitcham, A. J., D. H. Prothero, and J. C. Brooks. "The self-excited homopolar generator. I. Theory and electrical design." IEEE Transactions on Magnetics 25, no. 1 (1989): 362–68. http://dx.doi.org/10.1109/20.22565.

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29

Mitcham, A. J., D. H. Prothero, and I. Forster. "The self-excited homopolar generator. II. Mechanical and thermal design." IEEE Transactions on Magnetics 25, no. 1 (1989): 369–75. http://dx.doi.org/10.1109/20.22566.

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30

GHOROGHCHIAN, J., and J. BOCKRIS. "Use of a homopolar generator in hydrogen production from water." International Journal of Hydrogen Energy 10, no. 2 (1985): 101–12. http://dx.doi.org/10.1016/0360-3199(85)90042-4.

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31

Wenqi Ge, Shaoqong Tang, Luguang Yan, Changlian Yi, and Jie Qin. "Development and test of a 300 kW superconducting homopolar generator." IEEE Transactions on Magnetics 32, no. 4 (July 1996): 2280–83. http://dx.doi.org/10.1109/20.508621.

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32

Ohst, D., and D. Pavlik. "A series wound air core homopolar generator: SWAC for tactical armor applications." IEEE Transactions on Magnetics 25, no. 1 (1989): 387–92. http://dx.doi.org/10.1109/20.22569.

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33

Walls, W. "High-Speed High-Current Copper Finger Brushes for Pulsed Homopolar Generator Service." IEEE Transactions on Components, Hybrids, and Manufacturing Technology 9, no. 1 (March 1986): 117–23. http://dx.doi.org/10.1109/tchmt.1986.1136614.

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34

Jeong, Jae-Sik, Dong-kyun An, Jung-Pyo Hong, Hae-Joong Kim, and Young-Sik Jo. "Design of a 10-MW-Class HTS Homopolar Generator for Wind Turbines." IEEE Transactions on Applied Superconductivity 27, no. 4 (June 2017): 1–4. http://dx.doi.org/10.1109/tasc.2017.2669140.

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35

Zowarka, R., B. Rech, and K. Nalty. "Testing of a homopolar generator, energy storage inductor, opening-switch railgun system." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1826–32. http://dx.doi.org/10.1109/tmag.1986.1064706.

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36

Coradeschi, T. J. "Recommissioning and characterization of the Ardec 30 megajoule homopolar generator (for pulsed power)." IEEE Transactions on Magnetics 27, no. 1 (January 1991): 359–64. http://dx.doi.org/10.1109/20.101057.

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37

Hwang, Young Jin, Jae Young Jang, and Haeryong Jeon. "Overhang Effect Analysis of a Homopolar HTS Synchronous Generator Using 3D Finite Element Method." IEEE Transactions on Applied Superconductivity 30, no. 4 (June 2020): 1–5. http://dx.doi.org/10.1109/tasc.2020.2971437.

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38

Amirat, Yassine, Vincent Choqueuse, and Mohamed Benbouzid. "EEMD-based wind turbine bearing failure detection using the generator stator current homopolar component." Mechanical Systems and Signal Processing 41, no. 1-2 (December 2013): 667–78. http://dx.doi.org/10.1016/j.ymssp.2013.06.012.

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39

Price, J., and J. Kitzmiller. "Design of a homopolar generator for 400 m/s slip ring velocity brush testing." IEEE Transactions on Magnetics 22, no. 6 (November 1986): 1684–89. http://dx.doi.org/10.1109/tmag.1986.1064679.

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40

Tsao, P., M. Senesky, and S. R. Sanders. "An integrated flywheel energy storage system with homopolar inductor motor/generator and high-frequency drive." IEEE Transactions on Industry Applications 39, no. 6 (November 2003): 1710–25. http://dx.doi.org/10.1109/tia.2003.818992.

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41

Persad, C., D. R. Peterson, and R. C. Zowarka. "Composite solid armature consolidation by pulse power processing: a novel homopolar generator application in EML technology." IEEE Transactions on Magnetics 25, no. 1 (1989): 429–32. http://dx.doi.org/10.1109/20.22576.

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42

Weldon, W. F., and T. A. Aanstoos. "Single residency sintering and consolidation of powder metal alloys, intermetallics, and composites by pulsed homopolar generator discharge." Journal of Mechanical Working Technology 20 (September 1989): 353–63. http://dx.doi.org/10.1016/0378-3804(89)90044-2.

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43

Azzerboni, B., E. Cardelli, and A. Tellini. "Analysis of the magnetic field distribution in an homopolar generator as a pulse power source of electromagnetic launchers." IEEE Transactions on Magnetics 24, no. 1 (1988): 495–99. http://dx.doi.org/10.1109/20.43965.

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44

Jibin, Zou, and Fu Xinghe. "Influence of the Axial-Length Ratio of Permanent Magnet to Homopolar Induction on the Performance of Hybrid Excitation Synchronous Generator." IEEE Transactions on Plasma Science 39, no. 1 (January 2011): 368–73. http://dx.doi.org/10.1109/tps.2010.2063714.

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45

McKee, B., R. D. Vecchio, W. Condit, H. Riemersma, and L. Kilgore. "Experimental and analytical study of an Iron bar carrying axial flux and current with implications for Iron core homopolar generator design." IEEE Transactions on Magnetics 21, no. 5 (September 1985): 2123–31. http://dx.doi.org/10.1109/tmag.1985.1064017.

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46

Nelsen, E. M., J. Frankel, and L. M. Jenkins. "Non-genic inheritance of cellular handedness." Development 105, no. 3 (March 1, 1989): 447–56. http://dx.doi.org/10.1242/dev.105.3.447.

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Ciliates exhibit an asymmetry in arrangement of surface structures around the cell which could be termed handedness. If the usual order of placement of structures defines a ‘right-handed’ (RH) cell, then a cell with this order reversed would be ‘left-handed’ (LH). Such LH forms appear to be produced in Tetrahymena thermophila through aberrant reorganization of homopolar doublets back to the singlet condition. Four clones of LH forms were selected and subjected to genetic analysis to test whether this drastic phenotypic alteration resulted from a nuclear genetic change. The results of this analysis indicate that the change in handedness is not due to a genetic change in either the micronucleus or macronucleus. The LH form can, under certain circumstances, revert to the RH form, but typically it propagates itself across both vegetative and sexual generations with similar fidelity. While this analysis does not formally rule out certain possibilities of nuclear genic control involving regulatory elements transmitted through the cytoplasm, when the circumstances of origin and propagation of the LH condition are taken into account direct cortical perpetuation seems far more likely. Here we outline a conceptual framework centred on the idea of longitudinally propagated positional information; the positive evidence supporting this idea as well as further application of the idea itself are presented in the accompanying paper.
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47

Khatri, Rasish, Lawrence A. Hawkins, Massimiliano Ortiz Neri, Francesco Cangioli, and Davide Biliotti. "Design and Prototype Test Data for a 300 kW Active Magnetic Bearings-Supported Turbine Generator for Natural Gas Pressure Letdown." Journal of Engineering for Gas Turbines and Power 142, no. 1 (November 27, 2019). http://dx.doi.org/10.1115/1.4045277.

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Abstract A 300 kW integrated and fully sealed turboexpander-generator for natural gas pressure letdown (PLD) was developed by Baker Hughes, a GE company (BHGE), in conjunction with Calnetix Technologies. This paper describes the design and analysis of the generator, magnetic bearings, and touchdown bearings, with a focus on the dynamic performance and key characteristics of the machine. The permanent magnet (PM) synchronous generator is supported by PM-biased, homopolar magnetic bearings and has a maximum continuous operating speed (MCOS) of 31.5 krpm. A touchdown bearing system is implemented using rolling element bearings with soft mount supports. Also described is a thrust load balancing scheme that uses the thrust bearing coil current for reference. A time transient simulation showing the effect of process conditions on the AMB dynamics is shown. Preliminary data from the prototype mechanical run test are shown, including transfer functions measured using the magnetic bearings, Campbell diagram, and touchdown bearing drop test results.
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48

Persad, C., S. Raghunathan, B. H. Lee, D. L. Bourell, Z. Eliezer, and H. L. Marcus. "High-Energy High-Rate Processing of High-Temperature Metal-Matrix Composites." MRS Proceedings 120 (1988). http://dx.doi.org/10.1557/proc-120-23.

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AbstractAdvances in kinetic energy storage devices have opened up a new approach to powder processing of High Temperature Composites. The processing consists of internal heating of a customized powder blend by a fast electrical discharge of a homopolar generator. The high-energy high-rate “lMJ in 1s” pulse permits rapid heating of a conducting powder in a cold wall die. This short time at temperature approach offers the opportunity to control phase transformations and the degree of microstructural coarsening not readily possible using standard powder processing approaches. This paper will describe the consolidation results of two high temperature composite materials, (W-Ni-Fe)/B4C and (Ti3Al+Nb)/SiC. The focus of this study was the identification of the reaction products formed at the matrix/reinforcement interface as a function of input energy and applied stress. Input energies beyond a threshold value for each system were required to produce detectable reaction products. In the (W-Ni-Fe)/B4C system, the reaction products formed at 4000 kJ/kg input energy under 420 MPa applied stress were a series of complex carbides and borides including W2C, FeWB, Fe3C, Fe6W6C and Ni4B3. The intermetallic Fe7W6was also observed. In the (Ti3Al+Nb)/SiC system, the reaction products observed at 3400 kJ/kg and 210 MPa were TiC and TiSi2.
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49

Persad, C., B. H. Lee, C. J. Hou, Z. Eliezer, and H. L. Marcus. "Microstructure/Processing Relationships in High-Energy High-Rate Consolidated Powder Composites of Nb-Stabilized Ti3Al + TiAl." MRS Proceedings 133 (1988). http://dx.doi.org/10.1557/proc-133-717.

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ABSTRACTA new approach to powder processing is employed in forming titanium aluminide composites. The processing consists of internal heating of a customized powder blend by a fast electrical discharge of a homopolar generator. The high-energy high-rate “1MJ in 1s” pulse permits rapid heating of an electrically conducting powder mixture in a cold wall die. This short time at temperature approach offers the opportunity to control phase transformations and the degree of microstructural coarsening not readily possible with standard powder processing approaches. This paper describes the consolidation results of titanium aluminide-based powder composite materials. The focus of this study was the definition of microstructure/processing relationships for each of the composite constituents, first as monoliths and then in composite forms. Non-equilibrium phases present in rapidly solidified TiAl powders are transformed to metastable intermediates en route to the equilibrium gamma phase. The initial single phase beta in Nb-stabilized Ti3Al is transformed to alpha two with an intermediate beta two phase. In composite blends of TiAl powders mixed with Nb-stabilized Ti3Al powders a 10 μm thick interfacial layer is formed on the dispersed TiAl. Limited control of post-pulse heat extraction prevents full retention of the rapidly solidified powder microstructures.
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50

Golea, Daniela Georgiana. "Improvements in modern weapons systems: the use of dielectric materials for the development of advanced models of electric weapons powered by brushless homopolar generator." SSRN Electronic Journal, 2021. http://dx.doi.org/10.2139/ssrn.3894975.

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