Articoli di riviste: "Wound salient pole rotor synchronous machine"

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Delirani, Zohreh, Akbar Rahideh e Mohammad Mardaneh. "Analytical calculations of electromagnetic quantities for wound rotor salient-pole synchronous machines". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 40, n. 3 (15 febbraio 2021): 325–57. http://dx.doi.org/10.1108/compel-03-2020-0115.

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Purpose This paper aims to present an analytical electromagnetic model for wound rotor synchronous machines with a salient-pole rotor structure based on the two-dimensional subdomain technique. Design/methodology/approach The machine is divided into five active sub-regions: stator slots, stator slot openings, air gap, rotor slots and rotor slot openings. For each sub-region, the governing partial differential equations are derived and solved analytically. Findings The magnetic flux density distributions in all active sub-regions are analytically computed and other quantities such as back-emf, inductances, electromagnetic torque and unbalanced magnetic forces are also analytically calculated. The results of the analytical model are compared to those obtained from the finite element analysis to show the accuracy of the proposed model. Originality/value The two-dimensional analytical model of a wound rotor salient-pole synchronous machine using the sub-domain technique is the main contribution of the research.

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Zhu, Z. Q., Y. J. Zhou e J. T. Chen. "Electromagnetic Performance of Nonoverlapping Stator Wound Field Synchronous Machine With Salient Pole Rotor". IEEE Transactions on Magnetics 51, n. 11 (novembre 2015): 1–4. http://dx.doi.org/10.1109/tmag.2015.2442211.

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Bash, Michelle L., e Steven D. Pekarek. "Modeling of Salient-Pole Wound-Rotor Synchronous Machines for Population-Based Design". IEEE Transactions on Energy Conversion 26, n. 2 (giugno 2011): 381–92. http://dx.doi.org/10.1109/tec.2011.2105874.

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Chai, Wenping, e Byung-il Kwon. "Design and analysis of a hybrid-excited wound field synchronous machine with high reluctance torque utilization". International Journal of Applied Electromagnetics and Mechanics 64, n. 1-4 (10 dicembre 2020): 931–39. http://dx.doi.org/10.3233/jae-209407.

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The paper proposes a hybrid-excited wound field synchronous machine (HE-WFSM), which can achieve high reluctance torque utilization. The key of the proposed HE-WFSM is that two permanent magnets (PMs) assist each rotor pole in forming an additional magnetic flux circle. It is opposite to the magnetic flux circle along the q-axis in the WFSM. The reduction of the q-axis flux can help to improve the saliency ratio and reluctance torque. Additionally, the asymmetrical flux linkage achieves a closest current phase angle between the maximum field torque and the maximum reluctance torque. To highlight the advantages of the proposed HE-WRSM, a general WFSM was adopted as the basic machine and analyzed under the same operating conditions. All performances of the basic machine and proposed HE-WFSM were predicted using finite element analysis (FEA) in Jmag-Designer. Finally, it was confirmed that the proposed HE-WRSM can achieve high reluctance torque utilization.

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Prakht, Vladimir, Vladimir Dmitrievskii, Vadim Kazakbaev e Alecksey Anuchin. "Comparative Study of Electrically Excited Conventional and Homopolar Synchronous Motors for the Traction Drive of a Mining Dump Truck Operating in a Wide Speed Range in Field-Weakening Region". Mathematics 10, n. 18 (16 settembre 2022): 3364. http://dx.doi.org/10.3390/math10183364.

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A synchronous homopolar motor (SHM) has a salient pole passive rotor, an excitation winding located on the stator, and no permanent magnets, which ensures high reliability and makes this type of motor a good alternative to motors traditionally used in traction drives. However, there is no comparison between SHMs and conventional brushed synchronous machines for traction applications in the literature. In this paper, the performances of a wound rotor synchronous machine (WRSM) and SHM are theoretically compared at the operating points of a 370 kW dump mining truck drive traction curve that has a 10:1 constant power range in the field weakening region. The nine-phase motors under comparison have the same outer diameter of the stator lamination. Before comparison, both motor designs are optimized using the Nelder–Mead method to minimize the semiconductor inverter rated current and the operating cycle power loss. The main advantages of the WRSM, which was designed, are reduction in stator length, smaller losses, and smaller inverter. The reduction in the total stator length was by 1.23 times taking into account the winding end parts as well. Losses were reduced by 1.21 times for the same radius of the stator lamination. Finally, the cost of power modules of the inverter was decreased by 1.4 times. SHM is more reliable since its rotor does not have an excitation winding and a diode rectifier, as in a WRSM with a brushless exciter. In addition, SHM provides lower consumption of copper, which reduces the total mass and cost of active materials. This article also introduces a new term, “inverter utilization factor”, which can be useful, more informative than motor power factor, when comparing traction drives with different types of motors.

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Vaskovsky, Yu M., e K. M. Tatarinov. "EXTERNAL DAMPHER SYSTEM OF THE SALIENT POLE SYNCHRONOUS MACHINE". Tekhnichna Elektrodynamika 2022, n. 6 (27 ottobre 2022): 19–25. http://dx.doi.org/10.15407/techned2022.06.019.

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A comparative analysis of the characteristics of the salient pole synchronous machine for two variants of the rotor damping system design was performed by mathematical modeling methods. In the first embodiment, a traditional (internal) damping rotor system is used, which is made of electrically conductive rods immersed in the surface of the poles. In the second em-bodiment, the external damping system of the rotor is made in the form of conductive sheets fixed to the surface of the poles. It is noted that the external damping system of the rotor provides better asynchronous characteristics and is characterized by more uniform heating, which reduces the thermomechanical loads of structural elements. This design increases the reliability of the machine not only in the event of short-term asynchronous modes of operation, but also in the event of uneven air gap between the stator and rotor, which usually occurs during long operation of high-pole synchronous machines, such as hydro generators. References 10, figures 6.

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Hussain, Asif, Shahid Atiq e Byung-il Kwon. "Consequent-Pole Hybrid Brushless Wound-Rotor Synchronous Machine". IEEE Transactions on Magnetics 54, n. 11 (novembre 2018): 1–5. http://dx.doi.org/10.1109/tmag.2018.2837690.

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Nezli, Lazhari, e Mohand Mahmoudi. "Vector Control with Optimal Torque of a Salient-Pole Double Star Synchronous Machine Supplied by Three-Level Inverters". Journal of Electrical Engineering 61, n. 5 (1 settembre 2010): 257–63. http://dx.doi.org/10.2478/v10187-010-0037-0.

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Vector Control with Optimal Torque of a Salient-Pole Double Star Synchronous Machine Supplied by Three-Level InvertersThis work relates to the study of the vector control of the salient-pole double star synchronous machine drive (DSSM) fed by three-level inverters which are controlled by PWM hysteresis strategy. Indeed, it is a question of carrying out a decoupling between rotor flux and electromagnetic torque, by introducing a vector control with an optimal torque working and by imposing constant flux regime. Furthermore, to ensure a decoupled dynamic behavior of the machine as in the case of a DC machine, a regulation of the rotor current has been introduced through a chopper operating at 5 kHz chopping frequency, feeding the excitation circuit. The obtained results are very satisfactory and reveal the effectiveness of the proposed approach.

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Gozdowiak, Adam. "Faulty Synchronization of Salient Pole Synchronous Hydro Generator". Energies 13, n. 20 (20 ottobre 2020): 5491. http://dx.doi.org/10.3390/en13205491.

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This article presents the simulation results of hydro generator faulty synchronization during connection to the grid for various voltage phase shift changes in a full range (−180°; 180°). A field-circuit model of salient pole synchronous hydro generator was used to perform the calculation results. It was verified using the measured no-load and three-phase short-circuit characteristics. This model allowed observing the physical phenomena existing in the investigated machine, especially in the rotor which was hardly accessible for measurement. The presented analysis shows the influence of faulty synchronization on the power system stability and the construction components which are the most vulnerable to damage. From a mechanical point of view, the most dangerous case was for the voltage phase shift equal to −120°, and this case was analyzed in detail. Great emphasis was placed on the following physical quantities: electromagnetic torque, stator current, stator voltage, rotor current, current in rotor bars, and active and reactive power. The physical quantities existing during faulty synchronization were compared with a three-phase sudden short-circuit state. From this comparison, we selected the values of physical quantities that should be taken into account during design of new hydro generators to withstand the greatest possible threats during long-term work.

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Vaskovsky, Yu M., e O. A. Geraskin. "INFLUENCE OF REGIME AND OPERATIONAL FACTORS ON THE DAMPER SYSTEM OF THE SALI-ENT-POLE SYNCHRONOUS MACHINE ROTOR". Tekhnichna Elektrodynamika 2021, n. 2 (23 febbraio 2021): 47–57. http://dx.doi.org/10.15407/techned2021.02.047.

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The physical processes in the damping system of the salient-pole synchronous machine rotor, which cause the gradual destruction of its structure, have been studied. In particular, the distributions of currents, temperatures and thermomechanical stresses in the damping system rods during its operation in asynchronous and asymmetric modes of operation, as well as in case of rotor eccentricity. A field mathematical model has been developed that takes into account the combined action of three physical fields of different nature: electromagnetic, temperaturic, and thermomechanical stress fields, and allows estimating heating and thermomechanical loads in the damping system of the rotor of the salient-pole synchronous machine. According to the results of the analysis, the heating and thermomechanical loads of the structural elements were determined and recommendations for its structural improvement were given. References 9, figures 9, tables 1.

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Vaskovskiy, Yuriy, Alexandr Geraskin e Konstantin Tatarinov. "Research of dampher system damage physical processes of synchronous machines rotor". Bulletin of NTU "KhPI". Series: Problems of Electrical Machines and Apparatus Perfection. The Theory and Practice, n. 2 (6) (9 dicembre 2021): 19–24. http://dx.doi.org/10.20998/2079-3944.2021.2.04.

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The physical processes in the damper system of the rotor with the appearance of a static eccentricity of the rotor for two types of salient-pole synchronous machines - a capsule hydrogenator SGK 538/160-70M with a capacity of 22 MW and a synchronous generator with a capacity of 500 kW were investigated by means of mathematical modeling. A field mathematical model has been developed that takes into account the combined action of three physical fields of different nature: electromagnetic, temperature and field of thermomechanical stresses, and makes it possible to evaluate the heating and three-dimensional distribution of thermomechanical stresses in the structural elements of the rotor damper system of a salient-pole synchronous machine. These physical processes cause gradual destruction of the structure of the rotor damper system. It is proved that the primary cause of degradation and damage of the damping system of the rotor of an open-pole synchronous machine is the uneven distribution of induced currents in the rods at the poles of the rotor, which occurs when the machine works asynchronously or with the appearance of rotor static eccentricity. The largest induced currents and heat occur in the rods located at the edges of the pole pieces, while the central rods at the pole are heated significantly less. This asymmetric heating of the damping system of the rotor leads to significant thermomechanical stresses in the elements of the damping system of the rotor, which significantly depend on the magnitude of the eccentricity and slippery of the rotor in asynchronous mode. The magnitude of the total thermomechanical stresses in the rods is influenced not only by axially directed forces but also by transverse forces in the end short-circuiting elements. At considerable slippery and eccentricities there are inadmissibly big breaking forces which break cores and face short-circuiting elements of a damping system of a rotor. According to the results of the analysis, the heating and thermomechanical stresses of the structural elements were determined and recommendations for its structural improvement were given.

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Bukhari, Syed Sabir Hussain, Ali Asghar Memon, Sadjad Madanzadeh, Ghulam Jawad Sirewal, Jesús Doval-Gandoy e Jong-Suk Ro. "Novel Single Inverter-Controlled Brushless Wound Field Synchronous Machine Topology". Mathematics 9, n. 15 (23 luglio 2021): 1739. http://dx.doi.org/10.3390/math9151739.

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This paper proposes a novel brushless excitation topology for a three-phase synchronous machine based on a customary current-controlled voltage source inverter (VSI). The inverter employs a simple hysteresis-controller-based current control scheme that enables it to inject a three-phase armature current to the stator winding which contains a dc offset. This dc offset generates an additional air gap magneto-motive force (MMF). On the rotor side, an additional harmonic winding is mounted to harness the harmonic power from the air gap flux. Since a third harmonic flux is generated in this type of topology, the machine structure is also modified to accommodate the third harmonic rotor winding to have a voltage induced as the rotor rotates at synchronous speed. Specifically, four-pole armature and field winding patterns are used, whereas the harmonic winding is configured for a twelve-pole pattern. A diode rectifier is also mounted on the rotor between the harmonic and field windings. Therefore, the generated voltage on the harmonic winding feeds the current to the field winding for excitation. A 2D-finite element analysis (FEA) in JMAG-Designer was carried out for performance evaluation and verification of the topology. The simulation results are consistent with the proposed theory. The topology could reduce the cost and stator winding volume compared to a conventional brushless machine, with good potential for various applications.

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Humza, Muhammad, Tanveer Yazdan, Qasim Ali e Han-Wook Cho. "Brushless Operation of Wound-Rotor Synchronous Machine Based on Sub-Harmonic Excitation Technique Using Multi-Pole Stator Windings". Mathematics 11, n. 5 (23 febbraio 2023): 1117. http://dx.doi.org/10.3390/math11051117.

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This paper presents a topology for the brushless operation of a wound-rotor synchronous machine based on the subharmonic excitation technique by using two sets of multi-pole windings on the armature as well as on the rotor. The armature windings consist of a four-pole three-phase main winding and a two-pole single-phase additional winding, responsible for the generation of fundamental and subharmonic components of magnetomotive force (MMF), respectively. The rotor contains four-pole field winding and two-pole excitation winding. From the generated air gap MMF, the additional winding is responsible for induction in excitation winding, which feeds DC to the field winding through a rotating rectifier without the need of brushes. Then, the interaction of the magnetic field from the main and the field windings produces torque. The proposed topology is analyzed using 2D finite element analysis (FEM). From the analysis, the generation of the subharmonic component of MMF is verified, which helps in achieving the brushless operation of the wound-rotor synchronous machine. Furthermore, the performance of the proposed brushless multi-pole topology is compared with the existing dual three-phase winding multi-pole topology in terms of current due to induction, output torque, torque ripples, and efficiency.

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Sirewal, Ghulam Jawad, e Syed Sabir Hussain Bukhari. "Cost-Effective Scheme for a Brushless Wound Rotor Synchronous Machine". World Electric Vehicle Journal 12, n. 4 (16 ottobre 2021): 194. http://dx.doi.org/10.3390/wevj12040194.

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This paper proposes a new scheme for a brushless wound rotor synchronous machine (WRSM) by generating an additional, two-pole component of magneto-motive force (MMF) with a series-connected additional three-phase winding with the armature three-phase winding. Unlike existing brushless excitation schemes, which use the inverter to inject harmonic currents in the stator windings, the proposed scheme uses series-connected additional winding on the stator with the armature winding in a two-pole configuration. Consequently, as the current flows in the armature winding, it creates a fundamental rotating air gap flux to interact with the field flux. At the same time, additional rotating flux is created from the additional three-phase winding, which cannot synchronize with the field winding. This additional flux can cause the induction of a voltage in a winding with exactly the same number of poles. For this purpose, a harmonic winding is installed in the rotor along with the field winding connected through a diode bridge rectifier, in order to feed the direct current (DC) to the field winding for rotor excitation without an input current from the brush-slip-ring assembly. The 2D finite-element analysis (FEA) was performed to validate the brushless operation of the proposed machine system.

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Shams Ghahfarokhi, Payam, Andrejs Podgornovs, Ants Kallaste, Antonio J. Marques Cardoso, Anouar Belahcen, Toomas Vaimann, Oleg Kudrjavtsev, Bilal Asad e Muhammad Naveed Iqbal. "Steady-State Thermal Modeling of Salient Pole Synchronous Generator". Energies 15, n. 24 (13 dicembre 2022): 9460. http://dx.doi.org/10.3390/en15249460.

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This paper presents a practical thermal model of a synchronous generator for high-power applications. This model couples the lumped parameter thermal network and coolant network together to utilize the impact of the coolant’s temperature rising over the machine. Furthermore, the advanced multi-planes technique provides a more precise and higher resolution temperature distribution of various machine sections. Therefore, the machines are divided into five planes; three belong to the active part, and two are added to model the machine’s drive and non-drive end-regions. Furthermore, the paper pays special attention to describing the challenges and providing solutions to them during the heat transfer modeling and analysis. Finally, the analytical model is verified using experimental results on a synchronous generator with a salient pole rotor and an open self-ventilation (OSV) cooling system by comparing the analytical and experimental results. As a result, good correspondence between the estimated and measurement results is achieved.

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Garner, Karen S., Maarten J. Kamper e Andrew T. Loubser. "Performance Evaluation of Harmonic Reduced Non-Overlap Winding Wound Rotor Synchronous Machine". Energies 14, n. 22 (10 novembre 2021): 7501. http://dx.doi.org/10.3390/en14227501.

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The analysis and performance evaluation of a harmonic reduction strategy of a non-overlap winding wound rotor synchronous machine is conducted in this paper. The harmonic reduction strategy utilizes phase-shifts between coil currents to reduce sub- and higher-order harmonics. The design is performed on a 3 MW wound rotor synchronous machine with a 16/18 pole/slot combination. The application results in a lowered torque ripple and an increased efficiency of the designed machine. The manufacturing and testing of a 3 kW prototype to ascertain the effectiveness of the design is also presented. The practical measurements correlate successfully with the theoretical results.

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Lopac, Nikola, Neven Bulic e Niksa Vrkic. "Sliding Mode Observer-Based Load Angle Estimation for Salient-Pole Wound Rotor Synchronous Generators". Energies 12, n. 9 (27 aprile 2019): 1609. http://dx.doi.org/10.3390/en12091609.

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Synchronous generator load angle is a fundamental quantity for power system stability assessment, with possible real-time applications in protection and excitation control systems. Commonly used methods of load angle determination require additional measuring equipment, while existing research on load angle estimation for wound rotor synchronous generator has been limited to the estimator based on the generator’s phasor diagram and estimators based on artificial neural networks. In this paper, a load angle estimator for salient-pole wound rotor synchronous generator, based on a simple sliding mode observer (SMO) which utilizes field current, stator voltages, and stator currents measurements, is proposed. The conventional SMO structure is improved with use of hyperbolic tangent sigmoid functions, implementation of the second order low-pass filters accompanied with corresponding phase delay compensation, and introduction of an adaptive observer gain proportional to the measured field current value. Several case studies conducted on a generator connected to a power system suggest that the proposed estimator provides an adequate accuracy during active and reactive power disturbances during stable generator operation, outperforming the classical phasor diagram-based estimator by reducing mean squared error by up to 14.10%, mean absolute error by up to 41.55%, and maximum absolute error by up to 8.81%.

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Vikharev, D. Yu, e N. A. Rodin. "Model of implicit pole electric machine based on mathematical formulation of magnetic field in air gap". Vestnik IGEU, n. 6 (28 dicembre 2021): 27–37. http://dx.doi.org/10.17588/2072-2672.2021.6.027-037.

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When modeling transient processes in electric power systems, the issue of designing reliable models of electrical machines is of great interest. The most difficult task is to design the models of synchronous and asynchronous machines. The purpose of the project is to develop mathematical models of synchronous and asynchronous machines based on a generalized model of an implicit-pole machine that considers the change of rotor speed, geometric shapes, and the type of rotor and stator windings. Methods of mathematical modeling of electromagnetic fields in the air gap based on Maxwell equations and methods of the theory of electrical circuits are applied. A system of nonlinear differential equations is considered as a mathematical model of a generalized implicit-pole machine. The key assumption made is the high magnetic permeability of the stator and rotor cores. Technical data of real electric machines have been used for verification. Mathematical models of an implicit pole synchronous machine and an asynchronous machine with a phase rotor have been developed. These models can be used to analyze transient processes in the aggregate without dividing them into electromagnetic and electromechanical ones. The novelty of the models is the fact of non-sinusoidal distribution of the magnetic field in the air gap, various types of multiphase AC windings and rejecting the principle of constant rotation frequency at the time step of the simulation. The proposed mathematical models can be used to solve design problems, to analyze the modes of electric power systems, the operation of relay protection and automation of electric power facilities, and emergency automation. In the future, the equations that consider the influence of the damper circuits and the peculiarities of the windings will be added to the developed mathematical models. The purpose of further research is to develop models of salient-pole synchronous machines and asynchronous machines with a squirrel-cage rotor.

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Khlifi, M. A. "Explaining the d-q Magnetic Couplings Theoretically in Saturated Smooth Air-Gap AC Machines". Engineering, Technology & Applied Science Research 9, n. 1 (16 febbraio 2019): 3739–43. http://dx.doi.org/10.48084/etasr.2327.

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The current paper discusses the theoretically detailed physical analysis of the effects of main flux saturation in smooth air gap AC machines. For that purpose, three sections are presented. The first one deals for presenting equivalence saturation-air gap. The second presents the equivalence of inductances between saturation induction machines and a dismounted salient pole synchronous machine. The method analyzes the leakage inductances that properly represent the corresponding leakage fluxes. The third section treats the physical interpretation of the cross-saturation. It is possible to show that the equations and physical picture in a saturated smooth-air-gap machine are similar to the equations and physical picture in a non-saturated salient-pole machine, where mutual coupling exists between the direct and quadrature axes and the self-inductances are also different on the non-salient part of the machine due to the variation of the reluctance with the rotor angle.

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Bukhari, Syed Sabir Hussain, Fareed Hussain Mangi, Irfan Sami, Qasim Ali e Jong-Suk Ro. "High-Harmonic Injection-Based Brushless Wound Field Synchronous Machine Topology". Mathematics 9, n. 15 (22 luglio 2021): 1721. http://dx.doi.org/10.3390/math9151721.

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This paper discusses the design and analysis of a high-harmonic injection-based field excitation scheme for the brushless operation of wound field synchronous machines (WFSMs) in order to achieve a higher efficiency. The proposed scheme involves two inverters. One of these inverters provides the three-phase fundamental-harmonic current to the armature winding, whereas the second inverter injects the single-phase high-harmonic i.e., 6th harmonic current in this case, to the neutral-point of the Y-connected armature winding. The injection of the high-harmonic current in the armature winding develops the high-harmonic magnetomotive force (MMF) in the air gap of the machine beside the fundamental. The high-harmonic MMF induces the harmonic current in the excitation winding of the rotor, whereas the fundamental MMF develops the main armature field. The harmonic current is rectified to inject the direct current (DC) into the main rotor field winding. The main armature and rotor fields, when interacting with each other, produce torque. Finite element analysis (FEA) is carried out in order to develop a 4-pole 24-slot machine and investigate it using a 6th harmonic current injection for the rotor field excitation to both attain a brushless operation and analyze its electromagnetic performance. Later on, the performance of the proposed topology is compared with the typical brushless WFSM topology employing the 3rd harmonic current injection-based field excitation scheme.

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Mbadiwe, Enwelum I., Erwan Sulaiman, Zarafi Md Ahmad e M. F. Omar. "Permanent magnet flux switching motor technology as a solution for high torque clean electric vehicle drive". International Journal of Power Electronics and Drive Systems (IJPEDS) 10, n. 2 (1 giugno 2019): 575. http://dx.doi.org/10.11591/ijpeds.v10.i2.pp575-584.

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<span lang="EN-US">A breakthrough in this century has been the development of electric vehicle which is propelled by electric motor powered by electricity. Already, many electric motors have been used for electric vehicle application but performances are low. In this paper, a permanent magnet motor technology using unconventional segmented rotor for high torque application is presented. Unlike conventional motors, this design, flux switching motor (FSM) is an advance form of synchronous machine with double rotating frequency. It accommodates both armature winding and flux source on the stator while the rotor is a simple passive laminated sheet steel. Conventionally, rotor of the maiden FSM and many emerging designs have focused on the salient pole, this design employs segmented rotor. Segmented rotor has advantages of short flux path more than salient rotor pole resulting in high flux linkage. Geometric topology of the proposed motor is introduced. It consists of 24Stator-14Pole using PM flux source with alternate stator tooth armature winding. The 2D-FEA model utilized JMAG Tool Solver to design and analyze motor’s performance in terms of torque with average torque output of 470Nm. The suitability of segmented outer-rotor FS motor as a high torque machine, using permanent magnet technology is a reliable candidate for electric vehicle.</span>

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Masoud, M. I., J. E. Fletcher e B. W. Williams. "Decoupled Control of Rotor Torque and Rotor Electric Power Delivered in a Salient-Pole, Synchronous Machine". IEEE Transactions on Energy Conversion 20, n. 1 (marzo 2005): 45–52. http://dx.doi.org/10.1109/tec.2004.841515.

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Bukhari, Syed Sabir Hussain, Qasim Ali, Jesús Doval-Gandoy e Jong-Suk Ro. "High-Efficient Brushless Wound Rotor Synchronous Machine Topology Based on Sub-Harmonic Field-Excitation Technique". Energies 14, n. 15 (22 luglio 2021): 4427. http://dx.doi.org/10.3390/en14154427.

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This paper presents a new high-efficient three-phase brushless wound rotor synchronous machine (BL-WRSM) based on a sub-harmonic field excitation technique. In the proposed machine topology, the stator is equipped with two different three-phase windings: (1) main armature winding, and (2) additional armature winding. The main armature winding is based on a 4-pole winding configuration, whereas the additional armature winding is based on a 2-pole winding configuration. Both windings are supplied current from two different inverters, i.e., inverter-1, inverter-2, and simultaneously. Inverter-1 provides the regular input current to the main armature winding, whereas inverter-2 provides a three-phase current of low magnitude to the 2-pole additional armature winding. This generates an additional sub-harmonic component of MMF in the airgap beside the fundamental MMF. On the other side, the rotor is equipped with (1) harmonic, and (2) field windings. These windings are electrically coupled via a rectifier. The fundamental component of MMF produces the main rotating magnetic field, whereas the sub-harmonic MMF gets induced in the harmonic winding to produce harmonic current. This current is rectified to give DC to the rotor field winding to attain brushless operation. To authenticate the operation and analyze its performance, the proposed BL-WRSM topology is supported using 2-D finite element analysis (FEA) in JMAG-Designer. Later on, the performance of the proposed brushless topology is compared with the customary BL-WRSM topology to verify its high efficiency, high output torque, low torque ripple, and low unbalanced radial force on the rotor.

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Rafin, S. M. Sajjad Hossain, Qasim Ali e Thomas A. Lipo. "A Novel Sub-Harmonic Synchronous Machine Using Three-Layer Winding Topology". World Electric Vehicle Journal 13, n. 1 (4 gennaio 2022): 16. http://dx.doi.org/10.3390/wevj13010016.

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This paper proposes a novel brushless synchronous machine topology that utilizes stator sub-harmonic magnetomotive force (MMF) for desirable brushless operation. The sub-harmonic MMF component that is used in this novel topology is one fourth of the fundamental MMF component, whereas, in previous practices, it was half. To achieve the brushless operation, the novel machine uses a unique stator winding configuration of two sets of balanced 3-phase winding wound in 3 layers. For the rotor, additional winding is placed to induce the sub-harmonic component to achieve the brushless excitation. Unlike its predecessors, it utilizes maximum allowable space in the stator to house conductors in all of its slots. To implement the topology, 8-pole, 48-slot sub-harmonic brushless synchronous machine model has been designed. A 2-D finite element analysis (FEA) is used to simulate and validate the performance of the novel machine as a motor. The proposed topology shows better average torque than the existing sub-harmonic wound rotor brushless synchronous machine topologies.

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Burakov, Andrej, e Antero Arkkio. "Low-order parametric force model for a salient-pole synchronous machine with eccentric rotor". Electrical Engineering 89, n. 2 (24 febbraio 2006): 127–36. http://dx.doi.org/10.1007/s00202-006-0327-5.

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Yan, Ying, Syed Sabir Hussain Bukhari e Jong-Suk Ro. "Novel Hybrid Consequent-Pole Brushless Wound Rotor Synchronous Machine for Improving Torque Characteristics". IEEE Access 10 (2022): 35953–64. http://dx.doi.org/10.1109/access.2022.3163824.

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27

KHAN, Faisal, Erwan SULAIMAN e Md Zarafi AHMAD. "A novel wound field flux switching machine with salient pole rotor and nonoverlapping windings". TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES 25 (2017): 950–64. http://dx.doi.org/10.3906/elk-1507-80.

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28

Smirnov, Alexander, Andrey Dar’enkov e Evgeny Kryukov. "Arranging coil winding circuits of synchronous permanent-magnet machines on rotor". International Journal of Power Electronics and Drive Systems (IJPEDS) 14, n. 4 (1 dicembre 2023): 1976. http://dx.doi.org/10.11591/ijpeds.v14.i4.pp1976-1982.

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<span lang="EN-US">Methodology of constructing coil winding electrical circuits for salient-pole stator of electrical permanent-magnet machines on the rotor is proposed, which is based on the required number of pole pairs (synchronous speed) and the number of phases. The methodology algorithm is based on determining the value of the number of stator teeth as the closest to the number of rotor poles number value, multiple of phase number, which provides a sufficient level of pitch coefficient and winding coefficient. The algorithm was tested by several examples of constructing synchronous machines winding circuits, known from electrical engineering theory and practice, including mass-produced ones. In all the examples, if the proposed methodology guidelines were formally and strictly followed, the correct circuit designs came out as a result. For high power motor pilot design, one and the same machine design variants were compared, having thirty six slots on stator, three-phase and nine-phase windings, synthesized according to the proposed algorithm for thirty two-pole rotor. Engine torque calculation with both circuit options performed by finite elements method showed the nine-phase winding developed torque advantage by 20%, due to less discretion of MMF slot distribution.</span>

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29

Felicetti, Roberto, Curt Johan David Abrahamsson e Urban Lundin. "The influence of eddy currents on the excitation winding impedance of solid and laminated salient pole synchronous machines". Electrical Engineering 102, n. 4 (1 luglio 2020): 2553–66. http://dx.doi.org/10.1007/s00202-020-01053-z.

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Abstract This work investigates the establishment of steady-state eddy currents in solid and laminated salient poles and rotor rim of synchronous machines due to a periodic excitation voltage. It shows that the presence of eddy currents in the rotor magnetic circuit has the double effect of increasing the excitation winding AC-resistance and decreasing its magnetizing AC-inductance. According to that a simple analytical model is presented in here which allows a rapid rough estimation of the excitation winding AC-resistance when little information is available about the machine geometry and its electric/magnetic materials properties. The model is then verified by reproducing in frequency the excitation winding AC-resistance and the related power loss measured in two synchronous generators. Finally, the limits of reliability and applicability of the model are discussed. The model has implications for periodic field winding current control and voltage regulation in synchronous machines.

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30

Banach, Henryk. "A Measurement Method of Determining the Power Supply Parameters for the Optimal Operation of a Synchronous Motor". Measurement Science Review 22, n. 1 (21 gennaio 2022): 11–16. http://dx.doi.org/10.2478/msr-2022-0002.

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Abstract The article presents a measurement method for determining the power supply parameters for the optimal operation of a synchronous motor, i.e. operation with minimal losses in the entire load range. The measurement strategy is based on the search for the minimum sum of the power supplied to the excitation circuit and the stator circuit for the assumed load torque values. The process of searching for the minimum sum of power can be significantly shortened and simplified by using a network parameter meter. The research confirmed the usefulness of the proposed method for determining the optimal operation parameters of a synchronous motor. The tested motor was a machine with a cylindrical rotor, but the developed method will also be applicable to synchronous machines with salient pole rotors.

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31

Jain, Amit Kumar, e V. T. Ranganathan. "Modeling and Field Oriented Control of Salient Pole Wound Field Synchronous Machine in Stator Flux Coordinates". IEEE Transactions on Industrial Electronics 58, n. 3 (marzo 2011): 960–70. http://dx.doi.org/10.1109/tie.2010.2048295.

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32

Valavi, Mostafa, Kari Gjerde Jorstad e Arne Nysveen. "Electromagnetic Analysis and Electrical Signature-Based Detection of Rotor Inter-Turn Faults in Salient-Pole Synchronous Machine". IEEE Transactions on Magnetics 54, n. 9 (settembre 2018): 1–9. http://dx.doi.org/10.1109/tmag.2018.2854670.

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33

Corley, M. J., e R. D. Lorenz. "Rotor position and velocity estimation for a salient-pole permanent magnet synchronous machine at standstill and high speeds". IEEE Transactions on Industry Applications 34, n. 4 (1998): 784–89. http://dx.doi.org/10.1109/28.703973.

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34

Chen, Wei, Jien Ma, Guichu Wu e Youtong Fang. "Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design". IEEE Access 8 (2020): 118989–99. http://dx.doi.org/10.1109/access.2020.3005762.

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35

Son, Rak-Won, e Ju Lee. "Alternative Surface-Mounted Permanent Magnet Topology for Reducing Voltage and Torque Harmonics in Shaft Generators". Energies 16, n. 12 (12 giugno 2023): 4649. http://dx.doi.org/10.3390/en16124649.

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Traditional diesel generators on a merchant ship, composed of a wound rotor synchronous generator and a four-stroke diesel engine, supply electrical power for various loads. Recently, shaft generators for merchant ships have been increasingly replacing diesel generators to reduce CO2 emissions through fuel efficiency improvement. In particular, permanent magnet synchronous generators have replaced induction generators due to their high-efficiency characteristics at light loads. The surface-mounted permanent magnet rotor can be a suitable topology owing to the relatively short constant power range. This generator can also operate as a motor according to the propulsion mode, so minimizing the harmonics of the induced voltage with the torque pulsation being essential. This paper proposes an alternative surface permanent magnet topology. Three magnets comprise one pole, with one bread-loaf magnet and two rectangular magnets. It helps to simplify the magnetization and assembly of the rotor because of the flat bottom shape of the magnet. Due to the low remanence of two rectangular magnets at the pole edge, this rotor structure effectively makes the air-gap magnetic flux density sinusoidal with production costs reduced. The step-skew suppresses higher-order harmonics. The total harmonic distortion comparison of the two-dimensional finite element analysis and the no-load test result shows under 6% difference from the interior permanent magnet prototype machine. A comparison of harmonic characteristics with other rotors shows that the proposed modular pole has sufficient competitiveness compared to the tapered bread-loaf type. It can be applied as a substitute for the tapered bread-loaf magnet in direct-drive ship propulsion systems and is expected to shorten the manufacturing process and time.

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36

Khlifi, Mohamed Arbi, e Habib Rehaoulia. "General modeling of saturated AC machines for industrial drives". COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 35, n. 1 (4 gennaio 2016): 44–63. http://dx.doi.org/10.1108/compel-12-2014-0346.

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Purpose – When magnetic saturation in ac machines is evolved, the theory of main flux saturation in d-q axes remains the best. Because of its simplicity, it is the most used in either motoring or generating mode for synchronous or asynchronous machines. Although, it is considered as a global way of introducing the iron saturation, compared to other methods, today, its fidelity has no contest in predicting complex ac machine operations. For this purpose, the aims of this paper consists of modeling these machines whatever the state-space variables values are taking into account the magnetic saturation. Two unified procedures are proposed. The first one deals with a common approach to establishing a complete and detailed model synthesis in d-q axes. The second also presents a unified approach to introducing magnetic saturation of the iron core in the characteristic equations. The analysis takes the salient pole synchronous machine as a general case of study. Then the approaches are extended to undamped and smooth air gap synchronous machines as well as induction machines. The paper aims to discuss these issues. Design/methodology/approach – The present paper, which is a first part of a work under study dealing with a unified method to derive multiple models of saturated ac machines, is intended to the description of an alternative method and its application for induction and synchronous machines. It mainly consists of the following parts: first, after writing the stator and rotor space vector d-q equations, the number of possible models is immediately discussed. By considering the currents and fluxes as state-space variables, 14 models are obtained for AC induction machine (IM and SM). They are classified into three families, current (three), flux (three) and mixed models (eight). Second, in order to easily introduce the magnetic saturation in the 14 developed models, a method is presented. It consists of just elaborating the model with the winding currents as state variables, then deriving all the other models from it. Third, to emphasize the influence of the presence of magnetic saturation, in each model, each inductance along the d and q axes is written with a fundamental expression which exists with or without saturation and an additional one due purely to saturation. Hence the additional terms can be studied and quantified in an easy way or simply removed when linear case is assumed. Fourth, adopting such strategy to write the different coefficients of the models had led to the definition of common saturation factors. In turn, the definition of common saturation factors had allowed the definition of different groups of models within each family. Fifth, an alternative to evaluate the static and dynamic saturation coefficients is also proposed. It is shown that by proper fitting of the experimental magnetizing curve, all saturation coefficients can be written only in terms of which is simply the magnitudes ratio of the magnetizing flux and current. Sixth, although the theory of the main flux saturation is now admitted, an investigation was carried out on a self-excited induction generator and the build-up of voltage and current phases of a standalone alternator, to prove the equivalence between the all developed models. Findings – The number of models based on the state-space variables choice, of a saturated ac machine, is reviewed. A simple method consisting of elaborating just the winding currents model, with magnetic saturation and deriving all the other models from it, is presented. In this study special interest was particularly focussed on either novel models or existing models cited in the literature but cannot be obtained by other approaches. In all cases, if the differential equations of the machine are formulated in terms of a set of variables other than the winding currents, a noticeable reduction in the size of equations may be obtained and consequently less time computing. The approach seems to be able to derive any possible model whatever the state-space variables and the type of the ac machine and hence can be classified as a general approach. Practical implications – The experiments of synchronous and induction machine transients prove the validity of the method. Originality/value – By suitable choice of state-space characteristic vectors among the fluxes and the currents, a synthesis of AC machine models in d-q axes is established. To introduce magnetic saturation in each model, an approach-based uniquely on the elaboration of the winding currents model is exposed and applied. In addition, the analysis gives a detailed classification of all found models taking into account the state variables nature as well as the cross-coupling coefficient considered as a saturation factor. The study is completed with a simple alternative to evaluate all saturation factors by just calculating the static magnetizing inductance.

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37

COUSSEAU, Romain, Raphaël ROMARY, François BALAVOINE, Miftah IRHOUMAH e Remus PUSCA. "Comparative Study of Permanent Magnet Synchronous Machine vs Salient Pole Synchronous Machine in High Temperature Application". European Physical Journal Applied Physics, 26 aprile 2022. http://dx.doi.org/10.1051/epjap/2022210279.

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This paper presents the sizing and the comparison of two synchronous machines. The purpose is to design a high temperature dedicated machine with the same performance as a permanent magnet machine. A salient pole wound rotor is chosen with anodized aluminum tape as windings.

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38

Bukhari, Syed Sabir Hussain, e Jong-Suk Ro. "Sub-harmonic-based Cost-effective Brushless Wound Rotor Synchronous Machine Topology". Applied Computational Electromagnetics Society Journal (ACES), 18 settembre 2023. http://dx.doi.org/10.13052/2023.aces.j.380510.

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This paper proposes a sub-harmonic-based brushless wound rotor synchronous machine (WRSM) topology. The proposed topology involves two three-phase stator windings with a different number of turns. Both windings are linked in parallel and are provided with current from a single inverter. One of these windings is a four-pole winding while the second winding is a two-pole winding. This arrangement generates a magneto-motive force (MMF) in the air-gap of the machine comprising of two components: a regular fundamental MMF and a sub-harmonic MMF. The fundamental component produces the main stator field whereas the sub-harmonic component generates a sub-harmonic field that is utilized to produce a harmonic current in a two-pole rotor harmonic winding. The induced harmonic current is rectified to inject direct current (DC) to the field winding and produce a four-pole rotor magnetic field. The four-pole rotor magnetic field when magnetically interacts with the same number of the main stator field poles producing torque. Finite element analysis (FEA) is carried out to confirm the operation and achieve the electromagnetic behavior of theproposed topology.

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39

Mohamodhosen, Bilquis, Abdelmounaïm Tounzi e Frédéric Gillon. "Rotor head shape optimization in a salient pole synchronous machine". International Journal of Applied Electromagnetics and Mechanics, 27 ottobre 2020, 1–11. http://dx.doi.org/10.3233/jae-209501.

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The purpose of this paper is to optimize the topology of the rotor head in a Salient Pole Synchronous Generator to maximize the magnetic flux in the stator yoke and in the air gap. The generator is modelled using FE method, and the ON-OFF method is used to manage the optimization domain. Genetic Algorithm is used to find the optimal solution for the problem. The resulting topology and convergence graphs are also presented, and the results are discussed.

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40

Albino Padilla, I., D. Olguín Salinas e A. Román Messina. "Sensitivity Analysis of the Dynamic Behavior of a Salient-Pole Synchronous Machine Considering the Static Rotor Eccentricity Effect". Journal of Applied Research and Technology 10, n. 5 (1 ottobre 2012). http://dx.doi.org/10.22201/icat.16656423.2012.10.5.363.

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This paper presents the sensitivity analysis of the behavior of a synchronous machine using the winding functiontheory considering the effect of static air-gap eccentricity. The winding function theory as a method to calculate theinductances of synchronous machines from the geometry and the actual arranging of the windings is presented. Then,detailed numerical simulations are carried out to examine the impact of eccentricity on the steady state regimes. Theimportant role of static eccentricity and its links with various symmetrical and asymmetrical operating conditions arediscussed as well as its influence on the machine parameters and performance are investigated. Experimental andanalytical parameter results are presented for a 60 Hz, six-pole laboratory synchronous machine connected to aninfinite bus under various static eccentricity conditions.

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41

Jiang, Xin, Guishu Zhao, Wei Hua, Shuye Ding, Zhe Chang e Yao Dai. "A Novel Multi-Excitation-Tooth Nonoverlapping Stator Wound Field Synchronous Machine with Salient Rotor". IEEE Access, 2022, 1. http://dx.doi.org/10.1109/access.2022.3185731.

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42

Rafin, S. M. Sajjad Hossain, Qasim Ali, Sajid Khan e Thomas A. Lipo. "A novel two-layer winding topology for sub-harmonic synchronous machines". Electrical Engineering, 21 marzo 2022. http://dx.doi.org/10.1007/s00202-022-01531-6.

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AbstractWith optimized design and modern brushless operation, wound rotor synchronous machines are resurrecting as a strong contender in many applications presently dominated by permanent magnet machines. Considering the notion, this paper introduces a novel brushless synchronous machine topology that utilizes sub-harmonic magnetomotive force (MMF) of its stator winding for desirable brushless operation. It is significant to state that the sub-harmonic MMF component that is used in this novel topology is one-fourth of the fundamental MMF component, whereas, in previous practices, it was half. Moreover, the stator of the machine uses a new winding arrangement of two sets of balanced three-phase windings wound in two layers to produce the fundamental and the sub-harmonic MMF. To achieve the brushless excitation, the rotor utilizes an additional winding that is used to induce the electromotive force (EMF) by the sub-harmonic MMF component of the stator. This novel two-layer stator winding topology permits the utilization of maximum allowable space in the stator to house conductors in all of its 48 slots, which was not the case in previous papers. To validate the performance, and feasibility, an 8-pole 48-slot brushless wound rotor synchronous motor is designed, and a 2-D finite element analysis simulation is conducted, where the topology shows immense potential in terms of better torque performance.

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