Homopolar motor technology development

Thome, R.J.; Creedon, W. P.; Reed, Matthew P.; Bowles, E.E.; Schaubel, K.M.

doi:10.1109/pess.2002.1043229

Cited by 21 publications

(6 citation statements)

References 2 publications

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“…Likewise, dc homopolar machines were also attempted worldwide, beginning with significant development work by Appleton in England [11] in the late 1960s. Similar efforts continued in the United States [12] until the first decade of the 21st century. These machines were mostly handicapped by insurmountable problems associated with brushes needed for current transfer back and forth to the rotor.…”

Section: Kalsi Green Power Systemsmentioning

confidence: 90%

High power density superconducting rotating machines—development status and technology roadmap

Haran

Kalsi

Arndt

et al. 2017

Supercond. Sci. Technol.

341

155

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Superconducting technology applications in electric machines have long been pursued due to their significant advantages of higher efficiency and power density over conventional technology. However, in spite of many successful technology demonstrations, commercial adoption has been slow, presumably because the threshold for value versus cost and technology risk has not yet been crossed. One likely path for disruptive superconducting technology in commercial products could be in applications where its advantages become key enablers for systems which are not practical with conventional technology. To help systems engineers assess the viability of such future solutions, we present a technology roadmap for superconducting machines. The timeline considered was ten years to attain a Technology Readiness Level of 6+, with systems demonstrated in a relevant environment. Future projections, by definition, are based on the judgment of specialists, and can be subjective. Attempts have been made to obtain input from a broad set of organizations for an inclusive opinion. This document was generated

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Section: Kalsi Green Power Systemsmentioning

confidence: 90%

High power density superconducting rotating machines—development status and technology roadmap

Haran

Kalsi

Arndt

et al. 2017

Supercond. Sci. Technol.

341

155

View full text Add to dashboard Cite

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“…In this regard, two subscale superconducting propulsion motors have been built [13][14][15]. One motor is a prototype 5 MW, 4.2 kV, 230 rpm, six-pole, 11.5 Hz synchronous type using hightemperature superconductor (HTS) coils in the rotor [14].…”

Section: Superconducting Motors and Generatorsmentioning

confidence: 99%

“…The stator employs liquid-cooled coils made from Litz wire. Another one is a 3.7 MW, 500 rpm DC homopolar type with stationary NbTi LTS coils that operates at 4.7 K [15]. Size and weight reductions of >50% in the world's first highest HTS-AC ship propulsion motor rated at 36.5 MW, 120 rmp [16] saves close to $1 million annually on fuel [17].…”

Section: Superconducting Motors and Generatorsmentioning

confidence: 99%

High power density technologies for large generators and motors for marine applications with focus on electrical insulation challenges

Ghassemi

2020

High Voltage

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High power density generators and motors are envisaged in modern all-electric ships where electrical power for both propulsion and service loads is provided through a common electrical platform known as an integrated power system. Three recent high-power density technologies for generators and motors proposed for marine applications are reviewed, and the author focuses on their electrical insulation challenges. These technologies are high-frequency (high-speed) generators (200-400 Hz), superconducting generators, and novel insulation materials and systems. For high-speed generators, high loss in magnetic materials may shorten its insulation life. Thus, these generators should be designed to be cooled by water instead of air. For superconducting generators, the most significant concern is the integrity of the insulation system over the large thermal excursion whenever the system is cycled between room temperature and operating temperature. In novel insulation materials and systems section: (i) using mica paper tapes containing boron nitride filler in the binding resin of the glass backing insulation, developed by Toshiba and Von Roll, resulted in a 15% increase in the MVA of generators for the same slot dimensions and operating temperatures, (ii) GE developed an enhanced polyethylene glycol terephthalate-mica tape having superior voltageendurance characteristics, (iii) Isovolta has introduced a mica paper tape using a flat glass fibre backing material, called Powerfab, rather than the more common woven structure, leading to a 15% reduced mica tape, and (iv) adding novel nanocomposites as fillers to ground wall insulation, introduced by Siemens, is a promising technique towards more high power density designs. Furthermore, accelerated aging of insulation systems especially those in electrical rotating machines exposed to voltage pluses with high slew rates up to hundreds of kV/μs and high-repetition rates ranging from hundreds of kHz to MHz is discussed. These voltage pulses are generated by wide bandgap-based converters envisaged in the medium voltage DC architecture for future U.S. naval ships.

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“…Estimates of magnetic shear stress in excess of 300 kPa have been made, and superconducting motors have been built and tested to as high as 36.5 MW [8]. Figure 20 shows a cartoon drawing of a superconducting motor sized for propulsion of a combatant ship [9]. The flip side of this is that the field windings of these machines must be cooled to cryogenic temperatures.…”

Section: Superconducting Synchronous Machinesmentioning

confidence: 99%

Motors for Ship Propulsion

2015

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Abstract-Electric propulsion of ships has experienced steady expansion for several decades. Since the early 20 th century, icebreakers have employed the flexibility and easy control of DC motors to provide for ship operations that split ice with back and forth motion of the ship. More recently, cruise ships have employed diesel-electric propulsion systems to take advantage of the flexibility of diesel, as opposed to steam engines, and because the electric plant can also be used for hotel loads. Research vessels, ferries, tankers, and special purpose vessels have also taken advantage of increased flexibility and fuel efficiency with electric propulsion. Today, the US Navy is building an 'all electric' destroyer to be named 'Zumwalt', that employs two induction motors for propulsion. There are several different classes of motors that might be considered for use in ship propulsion, ranging from DC (commutator) motors through conventional induction and synchronous motors to permanent magnet synchronous machines, doubly fed machines and superconducting AC and Acyclic Homopolar machines. This review paper describes features of some of the major classes of motor that might be used in ship propulsion.

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Homopolar motor technology development

Cited by 21 publications

References 2 publications

High power density superconducting rotating machines—development status and technology roadmap

High power density superconducting rotating machines—development status and technology roadmap

High power density technologies for large generators and motors for marine applications with focus on electrical insulation challenges

Motors for Ship Propulsion

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