Linear motors with transverse flux

Laithwaite, E.R.; Eastham, J.F.; Bolton, H.R.; Fellows, T.G.

doi:10.1049/piee.1971.0328

Cited by 53 publications

(20 citation statements)

References 4 publications

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“…Because of this difference, the path of magnetic flux in the secondary is relatively short in TFLIM [5]. The pole piece of the primary of TFLIM has a relatively large area, and less influenced by magnetic saturation due to skin effect in the secondary.…”

Section: B the Difference Of Transverse Flux Type And Conventional Typementioning

confidence: 99%

Improvement of Transverse Flux Linear Induction Motors Performances With Third Order Harmonics Current Injection

Nozaki

Baba

Shutoh

et al. 2004

IEEE Trans. Appl. Supercond.

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A noncontacting steel plate conveyance system using the transverse flux linear induction motor (TFLIM) is studied. The steel plate makes up the secondary of TFLIM. A combined control principle of levitation and propulsion for TFLIM is proposed. The output capacity of the power converter for control is limited by its maximum current, but the performance of TFLIM depends on its fundamental component. Then a third harmonic current injection scheme is considered for the drive system, in order to increase the fundamental component, keeping the value of the maximum current invariant.TFLIM characteristics are calculated both for the levitation and propulsion forces acting on the secondary steel plate, on the basis of a three-dimensional electromagnetic field analysing program (J-MAG Studio). In comparison with a sinusoidal current excitation, the propulsion and levitation force of TFLIM increases by 33% and 37%, respectively, when the harmonic current injection level is optimized. Thus, the harmonic current injection scheme is shown to be an effective and practical mean to realize a steel plate conveyance system. Index Terms-Combined lift and propulsion, linear induction motor, third order harmonic current injection, transverse flux machine.

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Section: B the Difference Of Transverse Flux Type And Conventional Typementioning

confidence: 99%

Improvement of Transverse Flux Linear Induction Motors Performances With Third Order Harmonics Current Injection

Nozaki

Baba

Shutoh

et al. 2004

IEEE Trans. Appl. Supercond.

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“…More recently, however, due to developments in linear induction motors, particularly of the transverse flux type (Laithwaite et al 1971, Eastham andLaithwaite 1973) it has been claimed that such machines might be used for combined levitation and propulsion of high-speed vehicles (Eastham and Laithwaite 1974). On the basis of a great deal of experimental work on relatively small models it is suggested that due to scaling laws for electromagnetic machines (Laithwaite 1973b) combined levitation and propulsion schemes, employing linear induction motors for vehicles weighing in excess of 50 tons, may have performances comparable to that of the superconducting magnet schemes.…”

Section: Levitation Using Induced Eddy Currentsmentioning

confidence: 99%

Electromagnetic suspension and levitation

Jayawant

1982

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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The phenomenon of levitation has attracted attention from philosophers and scientists in the past. The recent advances, notably in power electronics and magnetic materials, have focused this attention within the last decade on the application of electromagnetic suspension and levitation techniques to advanced ground transportation. Regardless of the fact that there is, in effect, a separate technology involved for each electromagnetic method, the whole subject is given a blanket title of 'maglev'. There is also a very wide range of industrial applications to which magnetic suspension techniques could be profitably applied, particularly in the area of high-speed bearings to reduce noise and to eliminate friction, and yet only high-speed ground transportation has caught the imagination of the media. This review deals with the physics and engineering aspects of the four principal contenders for advanced ground transportation systems and describes the most up-to-date developments in Germany, Japan, USA and the UK in this field. This article also describes some of the very recent challenging developments in the application of electromagnetic suspension and levitation techniques to contactless bearings. A fairly comprehensive bibliography is given to enable the more interested reader to pursue the topic further in any one of the technologies dealt with in this review.

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“…This type of relationship arises because a transverse-flux HLSM is being compared with a longitudinal-flux SLIM. If the SLIM were designed as a transverse-flux machine [5] the ratio of HLSM to SLIM track weights would be a constant divided by the SLIM excitation frequency. The HLSM frequency would not be a factor because the HLSM track is sized by the dc field flux.…”

Section: Kw and 3735 Kw Designsmentioning

confidence: 99%

Design Studies for Single-Sided Linear Electric Motors: Homopolar Synchronous and Induction

Nondahl

1980

Electric Machines & Power Systems

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Designs are made for longitudinal-flux, single-sided linear induction machines (SLIMs) and transverse-dc-flux homopolar linear synchronous machines (HLSMs). All machines have passive reaction rails. The machines are designed to provide tractive effort for conventional rail vehicles requiring output powers from 200 to 3735 kWand top speeds ranging from 112 to 400 km/hr. Magnetic levitation is not a design consideration for these vehicles. All designs are optimized to achieve minimum track weight and are made according to specified magnetic and thermal criteria. Under these assumptions, some of the HLSM advantages are: a higher power factor, much greater restoring forces for track misalignments, and less track heating. Some of the SLIM advantages are: no need to synchronize vehicle speed and excitation frequency precisely, a lower copper weight, simpler machine construction, and a more easily anchored track structure. When the required output power and available frequency are low the HLSM track is generally lighter than the SLIM track; the SLIM track is generally lighter for high powers and frequencies.

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Linear motors with transverse flux

Cited by 53 publications

References 4 publications

Improvement of Transverse Flux Linear Induction Motors Performances With Third Order Harmonics Current Injection

Improvement of Transverse Flux Linear Induction Motors Performances With Third Order Harmonics Current Injection

Electromagnetic suspension and levitation

Design Studies for Single-Sided Linear Electric Motors: Homopolar Synchronous and Induction

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