Comparison of Concentrated and Distributed Winding in an IPMSM for Vehicle Traction

Choe, You Young; Oh, Se Young; Ham, Sung Won; Jang, Ik Sang; Cho, Su Yeon; Lee, Ju; Ko, Kwang Wook

doi:10.1016/j.egypro.2011.12.1103

Cited by 16 publications

(14 citation statements)

References 2 publications

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“…In addition, winding topology influences the loss and heat generation in the electric machine, which is often a big challenge for external rotor type machines [6]. Overlapped distributed windings are the most common stator winding for conventional PMSMs, but such a winding arrangement results in long end‐windings and winding overlap [7]. Thus, when the axial length and end of motors are restricted, toroidal‐winding stator is very useful.…”

Section: Introductionmentioning

confidence: 99%

Design and characteristic analysis of a six‐phase direct‐drive permanent magnet synchronous motor with 60° phase‐belt toroidal winding configuration for electric vehicle

Wei

Zeng

et al. 2020

IET Electric Power Applications

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The six‐phase direct‐drive permanent magnet synchronous motor (DDPMSM) has a good prospect in electric vehicles, ship propulsion, aerospace and other fields due to the advantages of low voltage, high power, low speed and high torque. In this study, a six‐phase DDPMSM is proposed with 60° phase‐belt toroidal winding configuration (60°‐TW). Different from traditional overlapping windings, each coil of 60°‐TW is wound onto the stator yoke in the same direction. The topology of the proposed motor is introduced, and its operation principle is analysed by describing the variation of the magnetic field produced by the six‐phase 60°‐TW versus time. Meanwhile, based on the same power grade and effective volume, the six‐phase PMSM and dual‐three phase PMSM with different winding arrangements are designed. The magnetic field distribution, back‐EMF, cogging torque, torque and loss characteristics are explored in detail. The results show that the proposed six‐phase DDPMSM with 60°‐TW has the characteristics of low speed and high torque in comparison to the traditional six‐phase PMSM and dual‐three phase PMSM, which is expected for direct‐drive systems.

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Section: Introductionmentioning

confidence: 99%

Design and characteristic analysis of a six‐phase direct‐drive permanent magnet synchronous motor with 60° phase‐belt toroidal winding configuration for electric vehicle

Wei

Zeng

et al. 2020

IET Electric Power Applications

View full text Add to dashboard Cite

show abstract

“…In the meantime, in addition to the coercivity enhancement, a huge effort has gone into developing more effective motor cooling techniques, such as adapting distributed stator winding rather than concentrated winding and adapting air cooling or liquid cooling of the stator [19][20][21][22][23][24][25][26][27]. These cooling techniques have been increasingly put into practice in the EV and HEV traction motor.…”

Section: Introductionmentioning

confidence: 99%

Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity

Kwon

Kang

2019

Rare Met.

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Nd-Fe-B-type magnet is exclusively used as a rotor magnet in the traction motor of hybrid electric vehicle (HEV) and electric vehicle (EV), but its overly high operating temperature is a lingering problem attached to the magnet. The major cause of the high operating temperature is eddy current, which is readily generated in the highly conductive metallic magnet under alternating magnetic field from stator ripple. In this article, temperature rise in the Nd-Fe-B-type magnet with varying electrical resistivity under alternating magnetic field is discussed with the intention of highlighting the importance of enhancing the electrical resistivity for reducing the operating temperature of the Nd-Fe-B-type rotor magnet. Temperature rise in the Nd-Fe-B-type magnet (dielectric salt-added die-upset magnet) with high electrical resistivity is noticeably lower compared to the magnet (commercial sintered rotor magnet) with lower electrical resistivity, substantiating the theory that enhancing the electrical resistivity in the rotor magnet is fairly effective for suppressing the over-rise of its operating temperature during operation. Die-upset process is revealed to be particularly pertinent for the fabrication of highly dense salt-added magnet with high electrical resistivity.

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“…Comparisons between distributed and concentrated windings show that such a structure increases the iron losses and provides a high level of magnetic field harmonics in the air-gap. This phenomenon is still not acceptable for the machines that use permanent magnets mounted on the surface of the rotor [5]. Recent studies, combined with measurements provide important information about losses in the magnets and invite designers to handle such losses in order to prevent any increase in the magnets' temperature [12].…”

Section: Advantages and Drawbacksmentioning

confidence: 99%

“…One manufacturer, Fuji Electric, has initiated studies and experiments on a high-power generator that uses FSCW [2]. Comparisons between concentrated and distributed windings, show a lack of efficiency in machines using concentrated windings [3][4][5]. This machines provide between 1% and 5% less in efficiency and lower power factor.…”

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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Comparison of Concentrated and Distributed Winding in an IPMSM for Vehicle Traction

Cited by 16 publications

References 2 publications

Design and characteristic analysis of a six‐phase direct‐drive permanent magnet synchronous motor with 60° phase‐belt toroidal winding configuration for electric vehicle

Design and characteristic analysis of a six‐phase direct‐drive permanent magnet synchronous motor with 60° phase‐belt toroidal winding configuration for electric vehicle

Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

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