Analysis of souble star motor drives for electrical propulsion

Terrien, F.; Benkhoris, Mohamed Fouad

doi:10.1049/cp:19990996

Cited by 13 publications

(5 citation statements)

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“…The improvements due to double layer windings can be enhanced by applying the concept of a double star configuration [2,14,15]. The double star concept involves the use of two sets of 3 windings fed by two separate converters.…”

Section: B Winding Configurationsmentioning

confidence: 99%

Torque density improvements for high performance machines

Galea

Hamiti

Gerada

2013

2013 International Electric Machines &Amp; Drives Conference

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Φ Abstract -In this paper, the main aim is to propose and investigate possible methods for extending and improving the torque density capabilities of high performance, electrical machines. This is achieved by combining performance enhancing strategies such as the use of an outer rotor, the use of cobalt iron laminations and the adoption of high performance winding arrangements into a structured methodology that details the potential improvements step by step. A main point of interest of this paper is the permanent magnet demagnetisation analysis, resulting in the adoption of an optimum arrangement of a five stage, full-Halbach array. The above is presented in terms of an electrical machine used as an in-wheel motor in an aircraft traction application. Index Terms --Aerospace, Halbach arrays, high torque density, permanent magnets, synchronous machines I. INTRODUCTIONLECTRICAL machines for mobile applications such as the rail, aerospace and automotive industries have strong requirements for power and torque density. On top of this, reliability, cost-effectiveness, efficiency and availability are generally, additional, desirable requirements. This paper will look at methodologies for maximising torque density for a given application. The application considered is that of an in-wheel motor for aircraft traction. The machine is an outer rotor, permanent magnet (PM) machine which will be directly coupled to the aircraft wheel. A feasibility study and an electro-magnetic study of an electrical machine for such an application was presented in a previous paper [1].Considering the high torque density, fault tolerance and reliability requirements associated with such an application, the initial investigations indicate a 36-slot/42-pole, PM synchronous machine (PMSM) with an outer rotor as the most promising technology. In [1], measures to enhance the torque capability of the machine were identified, including measures to improve the winding factor K w , measures to obtain the best possible air-gap flux density B g (i.e. improve the fundamental component B g1 and minimise air-gap, spatial harmonics) and efforts to decrease the copper loss.In the first part of this paper, these torque improving measures are investigated and comparisons in terms of a set of quantifiable, quality indicating (QI) parameters are given. The second part of the paper builds on the methodologies presented in [1] in order to meet the application performance requirements. Design considerations for torque ripple T rip minimisations are presented while PM demagnetisation issues are also addressed.

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Section: B Winding Configurationsmentioning

confidence: 99%

Torque density improvements for high performance machines

Galea

Hamiti

Gerada

2013

2013 International Electric Machines &Amp; Drives Conference

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“…Dual 3-phase or 6-phase machines, which are also called double star or split-wound machines, with either 30 or 60 degree phase shift between the winding sets are one of the prominent studies [3], [6]. All of the motor types above have similar advantages of multi-phase machines clarified before and can be supplied by two separate 3-phase converters with reduced ratings.…”

Section: Introductionmentioning

confidence: 99%

A Novel Dual Three-Phase Permanent Magnet Synchronous Motor With Asymmetric Stator Winding

Demir¹,

Aydın

2016

IEEE Trans. Magn.

104

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Although three-phase PM motors are dominant in industry, multi-phase PM synchronous motors present higher torque-to-weight ratios, better efficiency and low torque ripple compared to 3-phase conventional PM motors. These features make fault tolerant multiphase PM motors become attractive for safety-critical applications. In this study, a novel PM multi-phase motor design with dual three-phase asymmetric stator winding is proposed. The winding structure of the proposed motor is unconventional due to selected slot-pole combinations. Therefore, an asymmetric winding is needed. Detailed finite element analyses of the proposed motor and performance comparison between conventional integer-slot (72-slot/12-pole motor) with symmetric winding and unconventional fractional-slot (78-slot/12-pole motor) PM motors with asymmetric windings is performed to see the benefits of the proposed motor. It was shown that the novel unconventional multi-phase PM motor has excellent torque quality and slightly higher torque density levels.Index Terms-Dual three-phase motor, multiphase PM motor, asymmetric stator winding, permanent magnet machine, synchronous motor, unbalanced winding.

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“…As far as six-phase synchronous motors are concerned, general modelling is available in the literature [4][5][6][7][8]. Analysis of a six-phase synchronous alternator with its two three-phase stator windings displaced by an arbitrary angle was carried out by Fuchs and Rosenberg [4], where an orthogonal transformation of the phase variables into a new set of (d − q) variables was employed.…”

Section: Introductionmentioning

confidence: 99%

“…In their companion paper [6], formulation of the relationships of mutual leakage inductances with winding displacement angle and pitch was carried out, applicable for different winding configurations of six-phase and proposed a scheme of a single machine uninterruptible power supply using a six-phase synchronous machine. Along with the presentation of modelling and simulation of a high power drives using a double star synchronous motor, the effect of winding displacement angle on torque ripple and harmonic effect was highlighted by Terrien and Benkhoris [7]. Authors in ref.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of an asymmetrical six-phase synchronous motor

Iqbal¹,

Singh²,

Pant³

2016

Turk J Elec Eng & Comp Sci

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This paper deals the stability analysis of a six-phase synchronous motor using eigenvalue criteria from its linearized model, so that the small displacement stability during steady-state condition can be accessed. Eigenvalue provides a simple but effective means for the stability analysis of a motor. An association between eigenvalues and motor parameters has been established, followed by the formulation of transfer functions and plotting the root locus of system, employing the dq0 approach in the MATLAB environment.

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Analysis of souble star motor drives for electrical propulsion

Cited by 13 publications

References 0 publications

Torque density improvements for high performance machines

Torque density improvements for high performance machines

A Novel Dual Three-Phase Permanent Magnet Synchronous Motor With Asymmetric Stator Winding

Stability analysis of an asymmetrical six-phase synchronous motor

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