HTS Dual-Stator Spoke-Type Linear Vernier Machine for Leakage Flux Reduction

Baloch, Noman; Khaliq, Salman; Kwon, Byung-il

doi:10.1109/tmag.2017.2699641

Cited by 30 publications

(14 citation statements)

References 13 publications

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“…To reduce the leakage flux in stator tooth, a design with hightemperature superconductor (yttrium barium copper oxide) bulks inserted between modulation poles is reported [98][99][100][101]. The inherent magnetic shielding effect of HTS materials results in a significant power factor improvement from 0.4 to 0.6 in a doublestator spoke-type linear PMVM for wave energy extraction.…”

Section: High-temperature Superconductor (Hts)mentioning

confidence: 99%

Permanent magnet vernier machine: a review

El-Refaie

2019

IET Electric Power Applications

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Permanent magnet vernier machines (PMVMs) gained a lot of interest over the past couple of decades. This is mainly due to their high torque density enabled by the magnetic gearing effect. This study will provide a thorough review of recent advances in PMVMs. This review will cover the principle of operation and nature of magnetic gearing in PMVMs, and a better understanding of novel PMVM topologies using different winding configuration as well as different modulation poles and rotor structures. Detailed discussions on the choice of gear ratio, slot-pole combinations, design optimisation and role of advanced materials in PMVMs will be presented. This will provide an update on the current state-of-the art as well as future areas of research. Furthermore, the power factor issue, fault tolerance as well as cost reduction will be discussed highlighting the gap between the current state-of-the art and what is needed in practical applications.

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Section: High-temperature Superconductor (Hts)mentioning

confidence: 99%

Permanent magnet vernier machine: a review

El-Refaie

2019

IET Electric Power Applications

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“…For this class of machine, high inductance and corresponding low operating power factor is inherent, and for a generator this means they can only be used when connected to an over-rated converter. For VPM machines, by ignoring the resistance of the stator winding the power factor can be improved by either increasing the flux linkage or minimising the inductance as stated in [1, 8,12,28], which can be verified by (4).…”

Section: Power Factormentioning

confidence: 99%

“…An unfortunate downside of this is that the coil driven flux sees a low reluctance, giving characteristically high inductance and a naturally low operating power factor [8][9][10]. In the last two decades a lot of research has been carried out on the VPM machines in order to improve their electromagnetic and electrical performances including torque density, efficiency and power factor [8,9,11,12]. Since both PMs and windings are placed on the stator, the linear version is attractive in long stroke applications.…”

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confidence: 99%

Design and Analysis of a Flux-Concentrated Linear Vernier Hybrid Machine With Consequent Poles

Almoraya

Baker

Smith

et al. 2019

IEEE Trans. on Ind. Applicat.

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 Abstract --In low speed applications, variable reluctance permanent magnet machines are often proposed due to their efficient use of magnet material and high torque density. This becomes even more important in large linear applications, where the translator is longer than the stator. Often, however, very low power factors are experienced by this class of machine. This paper proposes a V-shape flux concentrated version of a consequent pole linear Vernier hybrid permanent magnet machine and compares it to a surface mounted magnet variant. Using finite element analysis validated by two laboratory prototypes, it is shown that the flux concentrated version increases the airgap flux density, which potentially leads to an improvement in the force density and efficiency, or can be used to increase the operating power factor.Index Terms--consequent pole, V-shape, Vernier machine, power factor, linear machine, leakage flux.

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“…They may still prove favourable for long stroke machines with an over length translator [6]. Vernier Hybrid Machines (VHMs) have both the PMs and the coils mounted in the stator and have been developed for low-speed high torque directdrive applications, either in rotary [7][8][9] or linear versions [10,11]. Initially, they were also called Flux Reversal Machines due to the nature of their electromagnetic flux production [12,13].…”

Section: Introductionmentioning

confidence: 99%