| 1. |
- Alahakoon, Sanath, et al.
(författare)
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Emerging energy storage solutions for transportation - A review : An insight into road, rail, sea and air transportation applications
- 2015
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Ingår i: Electrical Systems for Aircraft, Railway and Ship Propulsion, ESARS. - : IEEE. - 9781479974009
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Konferensbidrag (refereegranskat)abstract
- Increasing usage of hybrid electric vehicles, plug-in electric vehicles and emerging new concepts in transportation such as electric highways have raised the significant role of energy storage solutions for transportation to its highest level. It is impossible to specify a single energy storage solution that can satisfactorily fulfill the varying performance demands of various applications in transportation. This paper will identify some of the most demanded performance requirements from some of the key applications in transportation and assess the suitability of emerging energy storage solutions against those.
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| 2. |
- Alahakoon, Sanath, et al.
(författare)
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Emerging Energy Storage Solutions for Transportation Electrification - A view
- 2019
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Ingår i: International Journal of Engineering and Technology Innovation. - : Taiwan Assoc Engineering & Technology Innovation. - 2223-5329 .- 2226-809X. ; 9:2, s. 75-90
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Forskningsöversikt (refereegranskat)abstract
- Energy storages have caught the attention of transportation community r the past several years. Rsecent developments in hybrid and plug-in ectric vehicles together with novel concepts in transportation such as ectric highways are the reasons for raising the role of energy orages in transportation to such a significant level. Performance mands for energy storage solutions vary significantly from one ansportation application to the other, making it difficult for the ientific community to converge to a single energy storage solution at caters all. This paper reviews the key performance demands of the jor transportation applications. It also investigates the aracteristics of emerging energy storage solutions and assess their itability for those reviewed transportation applications.
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| 5. |
- Nategh, Shafigh, et al.
(författare)
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Evaluation of Impregnation Materials for Thermal Management of Liquid-Cooled Electric Machines
- 2014
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Ingår i: IEEE Transactions on Industrial Electronics. - 0278-0046 .- 1557-9948. ; 61:11, s. 5956-5965
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the thermal impact of using different impregnation materials on high-performance liquid-cooled electric machines is studied. In this regard, varnish, Epoxylite, and a silicone-based thermally conductive material are considered. To study thermal effects of using different impregnation materials in theory, an advanced lumped-parameter thermal model of the studied electric machines is developed. In addition to the simulation studies, three identical induction machines using the aforementioned materials are manufactured and evaluated. Experimental tests are carried out at a wide range of current magnitudes and cooling conditions. A good agreement between the temperature measurements and corresponding simulation results is observed. It is demonstrated that using innovative thermally conductive materials in the stator slots and the end winding bodies of liquid-cooled electric machines results in a significant reduction in the winding hot spot temperature. Additionally, the influence of the critical parameters on the impregnation material performance, e. g., impregnation goodness and slot fill factor, is studied.
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| 6. |
- Nategh, Shafigh, et al.
(författare)
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Evaluation of stator and rotor lamination materials for thermal management of a PMaSRM
- 2012
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Ingår i: Proceedings of the 20th International Conference on Electrical Machines, ICEM 2012. - 9781467301428 ; , s. 1309-1314
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Konferensbidrag (refereegranskat)abstract
- In this paper, the thermal impact of using different steel laminations in the stator and the rotor of a permanentmagnet assisted synchronous reluctance machine designed for an automotive application is studied. In this regard, two main parameters of the steel lamination materials, thickness and amount of alloy content in weight percent, are studied. Frequency characteristics of the iron losses of the studied materials are used to estimate iron losses in the stator and rotor laminations. An accurate lumped parameter model including a housing water jacket cooling system is used to model thermal effects and estimate the temperature distribution in critical parts of the machine. The predicted temperature distributions in the machines show that using lamination materials with different amounts of alloy content leads to 2%-10% variation in the temperatures of rotor and winding. However, using materials with different thicknesses results in substantial temperature changes in critical parts of the machine (up to 75%).
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| 7. |
- Nategh, Shafigh, et al.
(författare)
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Thermal Analysis of a PMaSRM Using Partial FEA and Lumped Parameter Modeling
- 2012
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Ingår i: IEEE transactions on energy conversion. - 0885-8969 .- 1558-0059. ; 27:2, s. 477-488
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents an advanced lumped parameter (LP) thermal model for a permanent-magnet assisted synchronous reluctance machine (PMaSRM) developed for propulsion in a hybrid electric vehicle. Particular focus is put on the stator winding and a thermal model is proposed that divides the stator slot into a number of elliptical copper and impregnation layers. The model is enabled by the derivation of an approximate analytical expression for the thermal resistance of an elliptical cylinder with constant thickness. The approach is attractive due to its simplicity and the fact that it closely models the actual temperature distribution for common slot geometries. Additionally, an analysis, using results from a proposed simplified thermal finite element model representing only one slot of the stator and its corresponding end winding, is presented in which the number of layers and the proper connection between the parts of the LP thermal model representing the end winding and the active part of winding is determined. The presented thermal model is evaluated experimentally on a PMaSRM equipped with a water cooling jacket, and a good correspondence between the predicted and measured temperatures is obtained.
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| 8. |
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| 9. |
- Zhang, Hui, et al.
(författare)
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On fault tolerance for IPM-FSCW machines adopting a modular converter
- 2014
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Ingår i: 2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014. - 9781424412600 - 9781479951628 ; , s. 1633-1638
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Konferensbidrag (refereegranskat)abstract
- This paper investigates the fault-tolerant capability of a number of 30 kW permanent magnet (PM) machines with fractional-slot concentrated windings (FSCWs) when connected to two types of modular type converters recently proposed in the literature. Due to the strong PM rotor magnetization when using NdFeB-type magnets, the resulting short-circuit currents during a converter submodule short-circuit was found to be larger than the rated current which, potentially, may cause the machine to overheat. Reducing the PM rotor magnetization will reduce the short-circuit current but also affect the constant power speed range (CPSR). The results further highlight the importance of a tailored design specification when designing FSCW PM machines in automotive applications.
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| 10. |
- Zhao, An, et al.
(författare)
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FEM and CFD thermal modeling of an axial-flux induction machine with experimental validation
- 2024
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Ingår i: Case Studies in Thermal Engineering. - : Elsevier BV. - 2214-157X. ; 53
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Tidskriftsartikel (refereegranskat)abstract
- Axial-flux electrical machines are ideal candidates as in-wheel motors for electrical vehicles (EVs). Due to their characteristics of high power density and compact structure, thermal management is vital for them. Lowering the temperature of the stator windings can protect the insulation material from rapid degradation and reduce the extra copper losses by decreasing their electrical resistance. Contrary to the widely reported axial-flux permanent magnet synchronous machines, thermal modeling methods of axial-flux induction machines are rarely seen in previous literature. Hence, the present work aims at investigating their thermal response based on both the finite element method (FEM) and computational fluid dynamics (CFD) techniques. In addition, a test rig is built to validate the computed results of these two thermal models with the experimental measurement. The CFD conjugate heat transfer analysis is found to be more accurate than the FEM thermal analysis in predicting the temperature distribution of different components in the machine and the temperature rise of the airflow, with lower than 5 ∘C average errors deviating from the corresponding measured data at three rotation speeds. Additionally, the CFD simulation is able to capture the backflow occurring near the outlets of the casing that has been found during the experiments.
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