Design of a linear synchronous motor with high temperature superconductor materials in the armature and in the field excitation system

Pina, João Murta; Neves, Mário Ventim; McCulloch, Malcolm; Rodrigues, António

doi:10.1088/1742-6596/43/1/196

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…4, for instant t = 0 s. The MMF's corresponding to each phase current, fA, fB and fc are also plotted, where the total MMF is the sum of these. The total MMF of each topology may be decomposed as a series of travelling waves according to fmm (x, t) = L (an cost ct+ n x) + bn cost n x) (4) where is also clear that only space harmonics exists. The terms in an correspond to travelling waves with negative direction in x, while the ones in bn have positive direction.…”

Section: A Armature Topologiesmentioning

confidence: 99%

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Case Study in the Design of HTS Machines: an All Superconducting Linear Synchronous Motor

Pina

Neves

Rodrigues

2007

2007 International Conference on Power Engineering, Energy and Electrical Drives

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The electric and magnetic properties of high temperature superconductors and the possibility to cool them by cheap liquid nitrogen makes them attractive in power applications. An all superconducting linear synchronous motor is presented in this paper in order to quantify the benefits and disadvantages of such applications. The term "all superconducting" is related with the absence of copper conductors and iron parts. Certain characteristics of the superconducting materials impose severe restrictions when used, e.g., as armature windings. A numerical method for deriving the thrust and lift forces developed in such a motor, driven by a typical current inverter, is presented.

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Section: A Armature Topologiesmentioning

confidence: 99%

“…In linear motors the use of diamagnetism and pinning properties of the materials may allow a stable levitation, minimising mechanical losses. However, some other properties (e.g., cooling requirements) often turns applications unattractive [4] and even unfeasible.…”

Section: Introductionmentioning

confidence: 99%

Case Study in the Design of HTS Machines: an All Superconducting Linear Synchronous Motor

Pina

Neves

Rodrigues

2007

2007 International Conference on Power Engineering, Energy and Electrical Drives

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“…The researchers in Portugal developed a fully HTS linear synchronous motor. The primary coils are developed by using first generation HTS wires; whereas the secondary is composed of two single-domain YBCO bulks [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Status and research progress of the linear rail transit system in China

Zhang

et al. 2016

Transportation systems and technology

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Abstract:The linear rail transit system (LRTS) has the advantages such as high performance, low construction cost, easy maintenance, friendly with the environment, the researchers all over the world therefore has focused their interests on the LRTS. Despite its late start, China is marking a rapid progress on the study of the linear rail transit system. The LRTS in China can be divided into two types: maglev train system and the linear metro system. This article will revolve around the two aspects above to address the develop status and the newly research progress of the LRST in China. Meanwhile, the article also presents the research progress of the high-temperature superconducting (HTS) linear motors used for LRTS.

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“…HTS tapes mechanical limitations, turns motors' constructions more complex than conventional motors. In [4] - [10] several topologies of HTS motors are presented.…”

Section: Introductionmentioning

confidence: 99%

A Fractional Power Disk Shaped Motor with Superconducting Armature

Luis

Inácio

Pina

et al. 2011

Technological Innovation for Sustainability

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A disk-shaped, double stator, induction motor with High Temperature Superconducting (HTS) field coils is proposed in this paper. Copper, typically used in windings of classic machines, limits current density allowed in field coils due to Joule effect losses. Also iron, which is used in magnetic circuits, limits the magnetic flux density obtained in the air gap due to saturation. The application of HTS field coils and iron removal effect in fractional power disk shaped or axial flux motors is analyzed by comparison of two different stator topologies. Twelve HTS field coils made of Bi-2223 (Bi 2 Sr 2 Ca 2 Cu 3 O 1 0) first generation tape, wrapped around a racetrack-shaped nylon core, are assembled. A simple topology was chosen, consisting of six filed coils per semi-stator arranged in the same plane with 60 º displacement. This topology is analyzed theoretically, based on a linear induction motor approach and simulated using a commercial finite elements program, based on the same approach. In order to study the effect of magnetic saturation two stators were built. In the first, the field coils are assembled in steel plates. In the second, the same coils are assembled on nylon plates. The rotor is composed of an aluminum disk assembled on a stainless steel shaft. The HTS coils were cooled by liquid nitrogen (77 K). Simulations, experimental and theoretical results are consistent, showing high space harmonic distortion for the chosen topologies. It is shown that for this type of low power motors operating at this temperature, as iron saturation is not achieved, ferromagnetic materials removal is not a good option. Besides, flux leakage is to high, degrading developed torque.

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Design of a linear synchronous motor with high temperature superconductor materials in the armature and in the field excitation system

Cited by 6 publications

References 5 publications

Case Study in the Design of HTS Machines: an All Superconducting Linear Synchronous Motor

Case Study in the Design of HTS Machines: an All Superconducting Linear Synchronous Motor

Status and research progress of the linear rail transit system in China

A Fractional Power Disk Shaped Motor with Superconducting Armature

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