Review of Segmented Stator and Rotor Designs for AC Electric Machines

Aggarwal, Anmol; Strangas, Elias G.; Karlis, Athanasios

doi:10.1109/icem49940.2020.9270678

Cited by 16 publications

(2 citation statements)

References 32 publications

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“…Therefore, we need energy storage devices to store and supply energy whenever it is required. As a result, researchers are currently concentrating on developing innovative and sustainable energy storage devices like batteries, fuel cells, and supercapacitors (SCs). − SCs are identified as a bridge between conventional capacitors and secondary ion batteries offering several advantages over batteries, fuel cells, and conventional capacitors, including high power performance, wide operating temperature, extended cycle life, quick charging–discharging, and high efficiency. − Although, a lot of work is being done to develop innovative materials for SC electrode design, the energy density of SCs remains to be improved. Generally, carbon-based materials are used in commercial applications due to their low cost and high durability, nevertheless, their limited energy density restricts their potential as efficient energy storage solutions. , Transition metal hydroxides/oxides have emerged as viable substitutes, as they provide more energy density and areal capacitance than carbon-based materials.…”

Section: Introductionmentioning

confidence: 99%

Design of High-Performance Symmetric Supercapacitor Based on WSe₂ Nanoflakes for Energy Storage Applications

Tomar,

Issar,

Choudhary

et al. 2024

Energy Fuels

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Recently, transition metal dichalcogenides (TMDCs) have emerged as promising candidates as electrode materials for energy storage applications due to their remarkable physio-chemical properties. In the present work, a highly pure and crystalline tungsten diselenide (WSe 2 ) thin-film-based supercapacitive electrode has been successfully synthesized on a graphite substrate by using the DC magnetron sputtering method. Comprehensive characterization techniques including X-ray diffraction (XRD), Raman spectroscopy, Field emission-scanning electron microscopy (FE-SEM), and X-ray photoelectron spectroscopy (XPS) were employed to confirm the phase, elemental bonding, surface morphology, and chemical composition of the fabricated thin-film electrode, respectively. The sputtered WSe 2 thin-film electrode demonstrates an impressive increase in areal capacitance of almost 7.7 times when compared to the bare graphite substrate, with a measurement of 149.75 mF cm −2 . The electrode demonstrated excellent cyclic stability, retaining 86.15% of its capacitance even after 2000 cycles, showing the long-term usability and high potential of WSe 2 as an electrode. The capacitive performance of this symmetric supercapacitor device was carried out by using WSe 2 as a cathode as well as the anode with the 1 M Na 2 SO 4 electrolyte. Standing out in terms of electrochemical performance, the present symmetric supercapacitor executed a higher areal energy density and power density of 5.54 mWh cm −2 and 1197 mW cm −2 , respectively. This WSe 2 @graphite thin-film-based supercapacitive electrode with its superior electrochemical performance is believed to pave the way for the development of reliable and effective energy storage systems.

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Section: Introductionmentioning

confidence: 99%

Design of High-Performance Symmetric Supercapacitor Based on WSe₂ Nanoflakes for Energy Storage Applications

Tomar,

Issar,

Choudhary

et al. 2024

Energy Fuels

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“…With the introduction of the stator segmentation, many advantages can be achieved, such as better cooling, which is achieved with axial segmentation, reduced weight of the machine by removing some sections of the stator, simplified winding process by allowing better automatization techniques, ability to use different materials (e.g. oriented steel) and increased slot copper fill factor (Aggarwal et al , 2020; Kolb and Hameyer, 2020; Rens et al , 2016; Yuan et al , 2014; Balluff et al , 2018; Shen et al , 2016; Camilleri and Mcculloch, 2021). By increasing the slot copper fill factor, the power density and efficiency can be increased due to the higher magneto-motive force (MMF).…”

Section: Introductionmentioning

confidence: 99%

Influence of stator segmentation on iron losses in PMSMs for traction applications

Garmut

Petrun

2022

COMPEL

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Purpose This paper presents a comparative study of different stator-segmentation topologies of a permanent magnet synchronous machine (PMSM) used in traction drives and their effect on iron losses. Using stator segmentation allows one to achieve more significant copper fill factors, resulting in increased power densities and efficiencies. The segmentation of the stators creates additional air gaps and changes the soft magnetic material’s material properties due to the cut edge effect. The aim of this paper is to present an in-depth analysis of the influence of stator segmentation on iron losses. The main goal was to compare various segmentation methods under equal excitation conditions in terms of their influence on iron loss. Design/methodology/approach A transient finite element method analysis combined with an extended iron-loss model was used to evaluate discussed effects on the stator’s iron losses. The workflow to obtain a homogenized airgap length accounting for cut edge effects was established. Findings The paper concludes that the segmentation in most cases slightly decreases the iron losses in the stator because of the overall reduced magnetic flux density B due to the additional air gaps in the magnetic circuit. An increase of the individual components, as well as total power loss, was observed in the Pole Chain segmentation design. In general, segmentation did not change the total iron losses significantly. However, different segmentation methods resulted in the different distortion of the magnetic field and, consequently, in different iron loss compositions. The analysed segmentation methods exhibited different iron loss behaviour with respect to the operation points of the machine. The final finding is that analysed stator segmentations had a negligible influence on the total iron loss. Therefore, applying segmentation is an adequate measure to improve PMSMs as it enables, e.g. increase of the winding fill factor or simplifying the assembly processes, etc. Originality/value The influence of stator segmentation on iron losses was analysed. An in-depth evaluation was performed to determine how the discussed changes influence the individual iron loss components. A workflow was developed to achieve a computationally cheap homogenized model.

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WSe₂ Nanoflakes on Graphite Sheets for Flexible Symmetric Supercapacitors

Tomar,

Choudhary,

Malik

et al. 2024

ACS Appl. Nano Mater.

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In this study, we have investigated the electrochemical performances of a flexible symmetric supercapacitor (FSS) device based on WSe 2 nanoflakes thin film electrodes. The nanoflakes thin film electrodes were fabricated using environmentally friendly and costeffective DC magnetron sputtering. The as-prepared FSS device was tested in four different aqueous electrolytes containing group 1 alkali metal cations (HCl, LiCl, NaCl, and KCl), using several techniques, including cyclic voltammetry, galvanostatic charge/discharge, and impedance spectroscopy. The obtained results revealed that the FSS devices based on WSe 2 with nanoflake-type morphology in various electrolytes exhibit distinctive double-layer characteristics. The device tested in HCl electrolyte demonstrated the highest electrochemical performance, including an impressive areal capacitance of 88 mF cm −2 with corresponding energy and power density of 27.5 μWh cm −2 and 3000 μW cm −2 , respectively, at a constant current density of 4 mA cm −2 , along with a solution resistance of 0.5 Ω, within an operating voltage range of 1.5 V. The cationic mobility (Li + < Na + < K + < H + ) affects ionic conductivity, efficient ion/charge transition, as well as relaxation time and is found to be directly correlated with capacitance value. On the other hand, the order of the long-term cycle stability (LiCl < NaCl < HCl < KCl) is caused by the intricate interactions between ion size, charge density, mechanical stresses, and chemical interactions with the electrode material during the charging and discharging cycles. Furthermore, the use of 1 M HCl as an electrolyte yields superior capacitance performance (88 mF cm −2 ) and high cycling stability (75.36% capacitance retention after 5000 cycles) at 4 mA cm −2 . As a result, the electrolyte cations exert a significant impact on the electrochemical performance of the FSS.

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Review of Segmented Stator and Rotor Designs for AC Electric Machines

Cited by 16 publications

References 32 publications

Design of High-Performance Symmetric Supercapacitor Based on WSe₂ Nanoflakes for Energy Storage Applications

Design of High-Performance Symmetric Supercapacitor Based on WSe₂ Nanoflakes for Energy Storage Applications

Influence of stator segmentation on iron losses in PMSMs for traction applications

WSe₂ Nanoflakes on Graphite Sheets for Flexible Symmetric Supercapacitors

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Review of Segmented Stator and Rotor Designs for AC Electric Machines

Cited by 16 publications

References 32 publications

Design of High-Performance Symmetric Supercapacitor Based on WSe2 Nanoflakes for Energy Storage Applications

Design of High-Performance Symmetric Supercapacitor Based on WSe2 Nanoflakes for Energy Storage Applications

Influence of stator segmentation on iron losses in PMSMs for traction applications

WSe2 Nanoflakes on Graphite Sheets for Flexible Symmetric Supercapacitors

Contact Info

Product

Resources

About

Design of High-Performance Symmetric Supercapacitor Based on WSe₂ Nanoflakes for Energy Storage Applications

Design of High-Performance Symmetric Supercapacitor Based on WSe₂ Nanoflakes for Energy Storage Applications

WSe₂ Nanoflakes on Graphite Sheets for Flexible Symmetric Supercapacitors