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  • 1. Buyukdegirmenci, V. T.
    et al.
    Magill, M. P.
    Nategh, Shafigh
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Krein, P. T.
    Development of closed-form solutions for fast thermal modeling of rotating electric machinery2013In: Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013, IEEE , 2013, p. 832-838Conference paper (Refereed)
    Abstract [en]

    Accurate knowledge of winding temperature is critical for the control, protection, and real-time monitoring of high-performance electric machines. Lumped parameter and finite element analyses can be used to model thermal stress, but both have drawbacks in applications where fast estimates of local temperature distributions are necessary. To overcome this, a closed-form solution for the steady-state stator temperature distribution over one slot pitch in a radial air gap electric machine is presented. Machine symmetry and material thermal properties are used to create a representative layer model in which a solution to Laplace's equation is developed. In addition to lumped parameter and three-dimensional (3D) finite element models, the method is verified through experimental results. Analytical model winding temperature predictions are within about 2.5% of finite element model predictions. Estimates of stator slot, tooth, and end-winding temperatures are within 7% of experimental measurements. The results are shown to have value for parametric machine design and protection.

  • 2. Buyukdegirmenci, V. T.
    et al.
    Nategh, Shafigh
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Magill, M. P.
    Krein, P. T.
    A fast and flexible analytical approach for thermal modeling of a linear stator structure2013In: Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013, IEEE , 2013, p. 793-800Conference paper (Refereed)
    Abstract [en]

    A closed-form analytical solution for temperature distribution in a rectangular slot structure is presented. The methodology models windings, lamination and slot insulation as three distinct regions and formulates a boundary value problem for each region. The solutions follow Poisson's and Laplace's equations. The closed-form nature of the solution allows it to be used for electric machine design and protection. The model is compared with a lumped parameter model, and verified using three-dimensional finite element analysis (FEA) and experimental measurements on a linear induction machine. Slot temperature predictions using the proposed model are within 3.2% of FEA. Model temperature estimates in the slot, lamination, and end winding are all within 6.7% of experimental measurements. This temperature estimation accuracy suggests that the proposed approach is suitable for applications where fast and flexible thermal modeling is necessary.

  • 3.
    Huang, Z.
    et al.
    Lund University.
    Nategh, Shafigh
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Lassila, V.
    Alakula, M.
    Lund University.
    Yuan, J.
    Direct Oil Cooling of Traction Motors in Hybrid Drives2012In: 2012 IEEE International Electric Vehicle Conference, IEVC 2012, IEEE , 2012, p. 6183163-Conference paper (Refereed)
    Abstract [en]

    This paper presents comparisons of utilizing direct oil cooling approaches and conventional indirect cooling approaches for electrical motors which are mounted in HEVs or ZEVs. Both finite volume Computational Fluid Dynamic (CFD) model by FLUENT and finite element electromagnetic model by JMAG are applied to make the simulation accurate and comprehensive. Average temperature over the stator back, pressure drop between inlet and outlet and average heat transfer coefficient over the cooling duct are evaluated under identical flow rate, velocity and pressure drop for different cooling approaches. In addition, the influences on torque and power performances by the cooling ducts made in the housing or stator back are evaluated by JMAG model. The directly cooled motors show lower temperature rises at the stator back since the direct contact between coolant and stator back can avoid the unnecessary thermal contact resistances between the stator back and housing, meanwhile make the coolant more close to the heat sources, and thus improve the cooling efficiency.

  • 4.
    Krings, Andreas
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Nategh, Shafigh
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Stening, Alexander
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Grop, Henrik
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Measurement and Modeling of Iron Losses in Electrical Machines (Invited Paper)2012In: Proceedings of the 5th International Conference Magnetism and Metallurgy WMM'12, Gent, Belgium: Gent University , 2012, p. 101-119Conference paper (Other academic)
    Abstract [en]

    This paper gives an overview of nowadays used simulation models and measurement methods in order to determine iron losses in electrical machinery. The paper provides machine designers and system engineers with an overview of suitable iron loss models applicable for the machine design process and simulations. Furthermore, possible methods for iron loss measurements in electrical machines are presented from ongoing research projects. Besides standard electrical power measurements, iron losses are determined by thermal and magnetic property measurements, taking into account different IEC and IEEE standards.The goal is to emphasize the different possibilities of iron loss measurement methods and possible application areas for electrical machinery.

  • 5.
    Krings, Andreas
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Nategh, Shafigh
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Influence of the Welding Process on the Magnetic Properties of a Slot-less Permanent Magnet Synchronous Machine Stator Core2012In: Proceedings of the 2012 XXth International Conference on Electrical Machines, IEEE conference proceedings, 2012, p. 1331-1336Conference paper (Refereed)
    Abstract [en]

    In this paper, the influence of the welding processduring the manufacturing of small, slot-less permanent magnetsynchronous machines (PMSMs) is studied. The focus lies onthe change of the magnetic properties and the iron losses inthin, high quality Si-alloyed electrical steel sheets (NO 20). It isshown that the welding process changes the magnetic materialproperties significantly and increases the specific iron losses.Experimental results are provided for magnetic flux densitiesup to 1.3 T and frequencies in the range of 0.1Hz to 200Hz.

  • 6.
    Krings, Andreas
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Nategh, Shafigh
    SmartMotor AS, Rolls-Royce Group, Norway .
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Influence of the Welding Process on the Performance of Slotless PM Motors With SiFe and NiFe Stator Laminations2014In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 50, no 1, p. 296-306Article in journal (Refereed)
    Abstract [en]

    The influence of the welding process during the manufacturing of small slotless permanent-magnet synchronous machines (PMSMs) is studied in this paper. The focus lies on the change of the magnetic properties in high-quality silicon-iron (SiFe) and nickel-iron (NiFe) electrical steel sheets with thicknesses of 0.1 and 0.2 mm. It is shown that the welding process changes the magnetic material properties significantly and increases the specific iron losses. Experimental results are provided for magnetic flux densities up to 1.5 T and frequencies from quasi-static to 200 Hz. The obtained measurement data is afterward used in finite-element method (FEM) simulations to investigate the influence of the magnetic property changes on the motor performance, particularly with regard to stator core losses.

  • 7.
    Krings, Andreas
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Nategh, Shafigh
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Soulard, Juliette
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Local Iron Loss Identification by Thermal Measurements on an Outer-Rotor Permanent Magnet Synchronous Machine2012In: Proceedings of the 15th International Conference on Electrical Machines and Systems (ICEMS 2012), Sapporo: Institution of Electrical Engineers of Japan (IEEJ), 2012, p. 6401970-Conference paper (Refereed)
    Abstract [en]

    This paper presents the experimental determination of iron losses in an outer-rotor permanent magnet synchronous machine (PMSM) by using an inverse thermal model (ITM) in connection with transient thermal measurements. First, the theory and assumptions lying behind the method are presented. Afterwards, 3D finite element method (FEM) based simulations are used to determine the flux density distribution and iron losses in the magnetic steel parts of the investigated machine. Thermal measurements are conducted to determine local iron losses in the stator tooth tips using the ITM. Finally, measurement and FEM simulation results are compared.

  • 8. Moghadasian, P.
    et al.
    Nategh, Shafigh
    Shahid Chamran Univ, Dept Elect Engn.
    Kianinezhad, R.
    Seifossadat, S. Gh.
    A Direct Torque Control (DTC) Method for Dual Three Phase Induction Motor Using Fuzzy Inference System2008In: 2008 INTERNATIONAL SYMPOSIUM ON POWER ELECTRONICS, ELECTRICAL DRIVES, AUTOMATION AND MOTION, VOLS 1-3, 2008, p. 1082-1086Conference paper (Refereed)
    Abstract [en]

    In this work a Fuzzy Inference System is employed for the control of a PWM based Direct Torque Control (DTC), driving a dual three phase induction machine (DTPIM). DTPIM has two, three phase windings spatially phase shifted by gamma (=60 degrees in this research) electrical degrees. The proposed control scheme uses a Fuzzy Inference System to modulate the phase of stator voltage vector applied to the DTPIM. The simulation results show that the system performances are satisfactory using the proposed method.

  • 9.
    Nategh, Shafigh
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Thermal Analysis and Management of High-Performance Electrical Machines2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis deals with thermal management aspects of electric machinery used in high-performance  applications  with  particular  focus put  on electric machines designed for hybrid electric vehicle applications.

    In the first part of this thesis,  new thermal models of liquid (water and oil) cooled electric machines are proposed.  The proposed thermal models are based on a combination of lumped parameter (LP)  and numerical methods. As  a first  case study,  a permanent-magnet  assisted  synchronous reluctance machine (PMaSRM) equipped with a housing water jacket is considered.  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 impregna- tion layers.  Additionally, an analysis, using results from a proposed simplified thermal finite element (FE)  model representing only a single slot of the sta- tor 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 are determined. The approach is attractive due to its simplicity  and the fact  that it closely models the actual temperature distribution for common slot geometries.  An oil-cooled induction machine where the oil is in direct contact with the stator laminations  is also considered.  Here, a multi-segment structure is proposed that  divides  the  stator,  winding and cooling  system  into  a number  of an- gular  segments.   Thereby,  the  circumferential  temperature  variation  due to the  nonuniform distribution  of the  coolant  in the  cooling  channels  can be predicted.

    In the  second part  of this  thesis,  the  thermal  impact  of using  different winding impregnation  and steel  lamination  materials  is  studied.   Conven- tional varnish, epoxy and a silicone based thermally conductive impregnation material are investigated and the resulting temperature distributions in three small induction machines are compared. The thermal impact of using different steel lamination materials is investigated by simulations using the developed thermal  model  of the water  cooled  PMaSRM. The  differences  in alloy con- tents and steel lamination thickness are studied separately and a comparison between the produced iron losses and the resulting hot-spot temperatures is presented.

    Finally, FE-based approaches  for  estimating  the  induced  magnet  eddycurrent losses in the rotor of the considered PMaSRM are reviewed and compared in the  form  of a case  study  based on simulations.   A  simplified three-dimensional  FE model  and an analytical  model,  both  combined  with time-domain 2D FE analysis, are shown to predict the induced eddy current losses with a relatively good accuracy compared to a complete 3D FE based model.  Hence, the two simplified approaches are promising which motivates a possible future experimental verification.

  • 10.
    Nategh, Shafigh
    et al.
    Shahid Chamran University, Department of Electrical Engineering.
    Ghasemi, A.
    Kianinezhad, R.
    Seifossadat, S. Gh.
    Saneie, M.
    An Improved Fuzzy Model Based Sensorless Control for Six-Phase Induction Machines2008In: 2008 3rd IEEE Conference on Industrial Electronics and Applications, ICIEA 2008, 2008, p. 1469-1474Conference paper (Refereed)
    Abstract [en]

    The presented paper proposes a new scheme for the speed sensorless control of six phase induction motor. This method is based on the current estimation, in which the controlled stator voltage is applied to the induction motor so that the difference between stator currents of the mathematical model and motor can be forced to decay to zero. To make a better dynamic response and reduce the transient time, conventional PI controller has improved using non-linear scale controller. Also fuzzy logic controller has been used to obtain synchronous speed and eliminate steady-state speed error. The performance of the proposed algorithm is verified through simulation. 

  • 11.
    Nategh, Shafigh
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Huang, Zhe
    Krings, Andreas
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Thermal Modeling of Directly Cooled Electric Machines Using Lumped Parameter and Limited CFD Analysis2013In: IEEE transactions on energy conversion, ISSN 0885-8969, E-ISSN 1558-0059, Vol. 28, no 4, p. 979-990Article in journal (Refereed)
    Abstract [en]

    This paper presents a practical approach to model thermal effects in directly cooled electric machines. The main focus is put on modeling the heat transfer in the stator winding and to the cooling system, which are the two critical parts of the studied machines from a thermal point of view. A multisegment structure is proposed that divides the stator, winding, and cooling system into a number of angular segments. Thereby, the circumferential temperature variation due to the nonuniform distribution of the coolant in the cooling channels can be predicted. Additionally, partial computational fluid dynamics (CFD) simulations are carried out to model the coolant flow in the cooling channels and also on the outer surface of the end winding bodies. The CFD simulation results are used as input to the analytical models describing the convective heat transfer to the coolant. The modeling approach is attractive due to its simplicity since CFD simulations of the complete machine are avoided. The proposed thermal model is evaluated experimentally on two directly cooled induction machines where the stator winding is impregnated using varnish and epoxy, respectively. A good correspondence between the predicted and measured temperatures under different cooling conditions and loss levels is obtained.

  • 12.
    Nategh, Shafigh
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Huang, Zhe
    Lunds tekniska högskola.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Krings, Andreas
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Thermal Modeling of Directry Cooled Electric Machenes Using Lumped Parameter and Limited CFD AnalysisArticle in journal (Other academic)
  • 13.
    Nategh, Shafigh
    et al.
    Hormozgan Univ, Bandar Abbas, Iran .
    Kianinezhad, Reza
    Seifossadat, Seyed Ghodratollah
    Pishahang, A.
    Arjomand, A.
    A New Robust Model Based Sensorless Control for Six-Phase Induction Machines2009Conference paper (Refereed)
    Abstract [en]

    This paper proposes a new scheme for robust sensorless vector control of six phase induction motor. The method is based on the model current estimation, in which the controlled stator voltage is applied to the six phase induction motor so that the difference between stator currents of the mathematical model and the motor can be forced to decay to zero. To make a better dynamic response and to reduce the steady state error, conventional PI controller is replaced by a non-linear scale controller. Also, fuzzy logic controller has been used to estimate synchronous speed accurately. An effective online parameter estimation is used to identify both stator and rotor resistances for preventing uncertaiting due to parameter variations. The performance of the method is verified through simulation.

  • 14.
    Nategh, Shafigh
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Krings, Andreas
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Huang, Zhe
    Lunds tekniska högskola.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Lindenmo, Magnus
    Evaluation of stator and rotor lamination materials for thermal management of a PMaSRM2012In: Proceedings of the 20th International Conference on Electrical Machines, ICEM 2012, 2012, p. 1309-1314Conference paper (Refereed)
    Abstract [en]

    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%).

  • 15.
    Nategh, Shafigh
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Krings, Andreas
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Evaluation of Impregnation Materials for Thermal Management of Liquid-Cooled Electric Machines2014In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 61, no 11, p. 5956-5965Article in journal (Refereed)
    Abstract [en]

    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.

  • 16.
    Nategh, Shafigh
    et al.
    Shahid Chamran University, Department of Electrical Engineering.
    Moghadasian, P.
    Kianinezhad, R.
    Seifossadat, S. Gh.
    A New Sensorless Field-Oriented Control For Six-Phase Induction Machines2008In: SPEEDAM 2008: International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2008, p. 273-277Conference paper (Refereed)
    Abstract [en]

    In this paper, a new sensorless vector control technique for Six-Phase InductionMachines (SPIM) is presented. The machine has two three phase stator windings spatially shifted by 30 electrical degrees. The classical vector control of SPIM is employed. The proposed sensorless method does not require flux and speed estimators, it uses only difference between stator currents of the mathematical model and motor, then forces them to decay to zero. The proposed method, comparing to some traditional techniques, is simpler and does not need high computation time. The simulation results show that the closed-loop system performances are satisfactory using the proposed method. 

  • 17.
    Nategh, Shafigh
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Thermal analysis of permanent-magnet synchronous reluctance machines2011In: 14th European Conference on Power Electronics and Applications, 2011Conference paper (Refereed)
    Abstract [en]

    This paper presents a thermal analysis of permanent-magnet synchronous reluctance machines (PM-SRM). Particular focus is put on the rotor and two lumped parameter (LP) thermal models of the rotor are implemented and evaluated. The results of the two LP thermal models are compared to thermal simulations using the finite element method (FEM). Induced eddy current losses in the permanent magnets are computed using three-dimensional (3D) FEM computations whereas the losses in the electrical steel are obtained using a 2D FEM model. Based on type of cooling system, two cases are evaluated and the agreement between the two LP thermal simulations and the thermal FEM simulation is generally good but particular differences are highlighted. In the first case, the water cooling system manages to effectively handle the dominating copper losses which results in only a minor temperature difference between the shaft and the inner part of the stator teeth. In the second case, it is assumed that there is a significant temperature difference between the rotor shaft and the stator.

  • 18.
    Nategh, Shafigh
    et al.
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Wallmark, Oskar
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Leksell, Mats
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Zhao, Shuang
    KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
    Thermal Analysis of a PMaSRM Using Partial FEA and Lumped Parameter Modeling2012In: IEEE transactions on energy conversion, ISSN 0885-8969, E-ISSN 1558-0059, Vol. 27, no 2, p. 477-488Article in journal (Refereed)
    Abstract [en]

    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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