An investigation of slot-pole combinations for interior permanent magnet synchronous machines with different magnet topologies

Castano, Sandra M.; Jiang, James Weisheng; Bilgin, Berker; Sathyan, Anand; Dadkhah, Hossein; Emadi, Ali

doi:10.1109/iemdc.2017.8002414

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…These topologies can be divided into two main categories: surface magnet (SPM) rotor and interior magnet rotor (IPM). In comparison with other topologies, the SPM rotor configuration is widely adopted as an efficient solution, due to its simple structure, and ease of manufacture; the absence of magnetic salience and reduced tooth effect minimizes torque oscillation and makes control much easier [32,33]. In the case of the IPM rotor, the magnets are inserted in the rotor, which makes them intrinsically well protected mechanically and magnetically [32,33].…”

Section: Pm Configurationsmentioning

confidence: 99%

Design Optimisation Approach of an Outer Rotor Multiphase PM Actuator for Multirotor Aerial Vehicle Applications

Chahba,

Krebs,

Morel

et al. 2024

Aerospace

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The electric urban air mobility sector has gained significant attraction in public debates, particularly with the proliferation of announcements demonstrating new aerial vehicles and the infrastructure that goes with them. In this context, the development of new methodologies for the design and sizing of actuation systems, ensuring high performances of these aerial vehicles, remains an important task in this process. This will allow for better integration within this transport sector. In this paper, a robust design optimisation approach of multiphase fault-tolerant (FT) outer rotor (OR) permanent magnets (PM) for multirotor aerial vehicle applications is proposed. In order to show the effectiveness and the robustness of the proposed design methodology, the number of stator winding phases, with a fractional slot concentrated winding (FSCW) configuration, as well as the PM configuration are considered as variables. Thus, four cases for the number of phases are considered, namely 3, 5, 6 and 7 phases, where for each number of phases case, the PM takes 3 configurations, namely surface PM, interior V-shape PM and interior spoke PM. First, a pre-sizing step is carried out, consisting of selecting the optimal combinations slot/pole, designing the multiphase FSCW layout, and estimating the electric motor (EM) geometry using analytical computations to obtain a preliminary validation of the design specifications. Second, constrained multiobjective optimisation is considered in order to optimise the EM performances, such as motor efficiency and weight, under constraints where the FEMM/Matlab based Finite Element Analysis (FEA) tool is used to perform this optimisation. Finally, results analysis and performance comparisons of different EM configurations are carried out in order to assess the design parameters, such as phases number, PM position, and harmonic currents in the EM design and consequently to select the best configuration for the considered application.

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Section: Pm Configurationsmentioning

confidence: 99%

Design Optimisation Approach of an Outer Rotor Multiphase PM Actuator for Multirotor Aerial Vehicle Applications

Chahba,

Krebs,

Morel

et al. 2024

Aerospace

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show abstract

“…Bu durum seri üretimde maliyetin yüksek olması, sıcaklıkla beraber performansın düşmesi sorunlarını ortaya çıkarmaktadır. Bu tip motorlarda sabit güç-hız aralığı rotor yapısına bağlı olup rotorun optimizasyonu sabit güç hız aralığını iyileştirebilmektedir [5][6][7][8]. Tasarım süreci boyunca rotorda bulunan mıknatısların boyutları ve konumu üzerine yapılacak optimizasyon çalışmaları ile sürekli mıknatıs miktarının gerekli performansı sağlayacak şekilde minimuma indirilmesi hedeflenmiştir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Elektrikli araçlar için mıknatıs oranı ve moment titreşimi azaltılmış yüksek verimli sürekli mıknatıslı senkron motor tasarım süreci ve gerçeklenmesi

Araz

Yılmaz

2019

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Design and production procedure of an interior permanent magnet synchronous motor for EVs  Design of high efficiency and power density PMSM with reduced permanent magnet-mass and cost  Novel design approaches to reduce torque ripple and cogging torque In the near future, the reduction in petroleum and emission restrictions, especially with the development of batteries, electric motors and power electronics technologies, will inevitably lead to further influence of EVs. Figure A. IPM traction motor design and implementation process, experimental and FEA results Purpose: The aim is to design and implement internal permanent magnet synchronous motor with high efficiency and power density which is the main part of the drive system of electric vehicles Theory and Methods: The main parameters of the electric motor were determined by following the flowchart which is covering the design process. Analytical and numerical (FEA) analyzes were carried out and analysis deepened under various operating conditions. The effect of space harmonics, radial forces and cogging torque are reduced due to the unbalanced winding structure created by using the single slot number (57-slot/8-pole). Throughout the design process, optimizations on the structure, size and position of the permanent magnets have resulted in minimizing the magnet amount to provide the required performance and torque-speed characteristic. Thermal and structural strength analyzes of the motor were made. Results: As a result of detailed analytical, numerical analysis and optimizations, the IPM motor was produced and experiments have been made under different operating conditions in the test-setup. The optimized motor was mounted on the EV. The performance and road tests on the EV were successfully carried out. IPM traction motor design and implementation process, experimental and FEA results are shown in Figure A. Conclusion: In this study, considering the criteria of low torque ripples, high efficiency and power density requirements in the wide torque-speed region, the design of 57/8 unbalanced winding IPM motor with reduced permanent magnet ratio for electric vehicles were successfully realized.

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“…The main shortcomings of the studies conducted on the effect of slot/pole combinations is that they rely on simplistic assumptions, such as a constant yoke thickness, and the use of analytical approches and/or 2D models for machines with 3D flux paths [3], [11]- [14], which results in comparing topologies that are not truly optimal designs for their pole count. On the other hand, this paper systematically investigates the optimal design and pole count selection of a surface mounted AFPM machine.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Efficiency and Cost Limits of Fractional hp Axial Flux PM Machine Designs

Taran

Rallabandi

Heins³

et al. 2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

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Optimizing the design of electric machines is a vital step in ensuring the economical use of active materials. The three-dimensional flux paths in axial flux PM (AFPM) machines necessitate the use of computationally expensive 3D electromagnetic analysis. Furthermore, a large number of design evaluations is required to find the optimum, causing the total computation time to be excessively long. In view of this, a two-level surrogate assisted algorithm capable of handling such expensive optimization problems is introduced, which substantially reduces the number of FEA evaluations. The proposed algorithm is employed to optimally design an AFPM machine within a specified envelope, identifying the limits of cost and efficiency. Optimized designs with different rotor polarities are systematically compared in order to form the basis for a set of generalized design rules.

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An investigation of slot-pole combinations for interior permanent magnet synchronous machines with different magnet topologies

Cited by 9 publications

References 14 publications

Design Optimisation Approach of an Outer Rotor Multiphase PM Actuator for Multirotor Aerial Vehicle Applications

Design Optimisation Approach of an Outer Rotor Multiphase PM Actuator for Multirotor Aerial Vehicle Applications

Elektrikli araçlar için mıknatıs oranı ve moment titreşimi azaltılmış yüksek verimli sürekli mıknatıslı senkron motor tasarım süreci ve gerçeklenmesi

Exploring the Efficiency and Cost Limits of Fractional hp Axial Flux PM Machine Designs

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