New flexible harmonic cost effective concentrated winding topology

Moros, Oleg; Gerling, Dieter

doi:10.1109/iecon.2015.7392137

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…It is not only one winding factor, associated to the fundamental harmonic, which must be of high value as it is classically the case with integral-slot winding. In the paper, the chosen winding (Fig 3) presents significant winding factors for the four first harmonics (one to four) and is also easy to manufacture with short-end winding since it is tooth concentrated [9]. With a slot number per pole and per phase (spp) equal to 0.5 as for numerous machines for automotive, this winding has been used in a synchronous machine which has the ability to develop the same torque either with the first or with the third harmonic current thanks also to a special design of the rotor [10].…”

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confidence: 99%

Effect of Rotor Bar Number on Performance of Five-Phase Induction Machine for Traction

Mekahlia

Semail

Scuiller

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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The paper investigates the effect of the bar number on the performances of a five-phase squirrel-cage induction machine with fractional-slot tooth concentrated winding. With a same stator, five different rotor bar numbers are chosen and the rotor magnetic circuits are designed using an analytical approach. Then, a finite-element analysis is done under two different supply conditions: fundamental currents and third harmonic currents. Finally regarding the used winding specificities the possibility of second harmonic current supply is evaluated. The results are presented in a comparative way in order to determine the impact of rotor bar number on torque quality for the different supply modes.

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mentioning

confidence: 99%

Effect of Rotor Bar Number on Performance of Five-Phase Induction Machine for Traction

Mekahlia

Semail

Scuiller

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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“…From this figure, at the slip s = 0.6 or less causes negative torque, which makes motoring difficult. In the case of concentrated winding IM, the above measures can be taken by adopting a special winding pitch [25], [26]. On the other hand, in this study, the research will be conducted by adopting a method that combines the shortening of the armature circumference length with toroidally wound.…”

Section: A Stator Structurementioning

confidence: 99%

Experience of Toroidally Wound Double Rotor Axial-Gap Induction Machine With Soft Magnetic Composites

Aoyama¹,

Tsuya²,

Hirata³

et al. 2021

IEEE Open J. Ind. Applicat.

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In this paper, a double axial gap type induction motor having a toroidal winding stator structure is proposed for the purpose of improving the torque density and efficiency of the induction machine. It consists of an axial type squirrel-cage induction rotor, and a toroidal winding stator structure suitable for armature copper loss reduction, miniaturization and a double axial gap structure. After explaining the reasons for selecting the single stator and double rotor structures, the structural design of the prototype and the experimental setup will be reported. The slip-vs.-torque characteristics are measured to clarify the drive characteristics, and the features of the proposed motor used soft magnetic composites are discussed by the equivalent circuit method. As a result, it was experimentally clarified that the double axial gap type induction motor with soft magnetic composites has a high slip torque characteristic and the reduction of the excitation current is an important issue for improving the performance.

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“…The first one is based on the winding layout. Some researchers are working on asynchronous machines which are using FSCW [7], the magnetic field harmonics in this machine are not acceptable and any progress in this domain will be a benefit for both synchronous and asynchronous machines. The second one focuses on the magnets.…”

Section: Main Characteristicsmentioning

confidence: 99%

“…In the last section, it appears that it is possible to design a generator in which efficiency is as high as conventional machines. However, this study does not take into account the asynchronous machines that are now in interest of some laboratories [7,8]; it remains on permanent magnet machines which have a greater degree of realization and a well-identified market (wind generator, electric generation for ships, etc. ).…”

Section: Introductionmentioning

confidence: 99%

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

Barre¹,

Napame

2016

Machines

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Abstract:In electric power generation, customers want generators with high efficiency. Nowadays, modern turbo-generators have efficiencies greater than 98%. Although this amount should not be obtained for all kind of machines, efficiency will remain one of the main parameters for customer choice. Efficiency is also linked to the life of the machine: the higher the efficiency is, the longer the machine's lifetime. During the past decade, new forms of energy production have appeared and generators have been developed to fit well into this market. For example, wind generators evolved towards permanent magnet generators having high polarity and running at low speed. Nevertheless, their structure is not fixed. An industrial company has built a prototype of such a generator which uses fractional-slot concentrated-windings (FSCW). This kind of winding is not the structure used by default in such electrical machines. Another field of interest is in autonomous generators which can be used on boats. Even if everyone has in mind large merchant ships, we must not forget smaller ships, such as fishing boats and short-range cruise ships, which spend the most of their time near the coast. This kind of ship does nothave large areas for installing the electric generation or the electric propulsion. It is the reason why, in this article, we focus on the efficiency of machines using fractional-slot concentrated-windings. In many publications which compare performances between distributed and concentrated windings, the result is almost the same. The efficiency of FSCW is not as high as the efficiency associated to the machines which are using distributed windings. Design methods have to be redrawn to integrate, as soon as possible, the loss mitigation in order to provide the best efficiency in power conversion. The following discussion, step by step, introduces the loss mitigation in every part of a machine using FSCW. To close the discussion, a design is produced and it appears that efficiency can be enhanced with suitable design methods.

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New flexible harmonic cost effective concentrated winding topology

Cited by 7 publications

References 8 publications

Effect of Rotor Bar Number on Performance of Five-Phase Induction Machine for Traction

Effect of Rotor Bar Number on Performance of Five-Phase Induction Machine for Traction

Experience of Toroidally Wound Double Rotor Axial-Gap Induction Machine With Soft Magnetic Composites

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

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