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Journal articles on the topic 'Externally excited synchronous machine'

Author: Grafiati

Published: 3 June 2025

Last updated: 13 July 2025

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1

Nguyen, Duc-Quang, Linh Dinh Hai, Dinh Bui Minh, and Vuong Dang Quoc. "Analysis of Electromagnetic Parameters of Hybrid Externally Excited Synchronous Motors for Electric Vehicle Applications." Engineering, Technology & Applied Science Research 13, no. 3 (2023): 10670–74. http://dx.doi.org/10.48084/etasr.5824.

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This paper presents two different approaches to improve the electromagnetic torque and output power of the hybrid Externally Excited Synchronous Motor (EESM) applied to Electric Vehicles (EVs). An analytical approach is first considered to define the main parameters of the proposed machine. Based on the obtained results from the analytical model, the hybrid EESM is designed with different rotor shapes and step-skewing magnet segments to reduce the total losses and improve torque ripple. Then, Finite Element Analysis (FEA) is applied to compute and simulate electromagnetic parameters, such as the magnetic flux density, mean torque, and output power. The development of these two approaches is validated on an actual EESM machine and the agreement with the theory is shown.

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2

Zuščak, Jozef, Vladimír Kujan, and František Janíček. "Simulations and measurements on a self-excited induction generator." Journal of Electrical Engineering 69, no. 5 (2018): 359–65. http://dx.doi.org/10.2478/jee-2018-0052.

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Abstract Paper deals with the use of an induction machine in the role of a generator. Such an operational mode is called a self-excited induction generator SEIG. It does not require an external power source to create the excitation field, as is the case with traditional synchronous generators. Therefore, it is widely used in power plants with renewable energy as a primary source (wind, water, etc). However, in terms of possible regulation and control of the electrical properties, the excitation process is extremely important. A mathematical model and simulation in Matlab are introduced. The excitation process was experimentally investigated in the laboratory of electric drives and the results are correlated with the expectations.

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3

Livio Šušnjić. "BRUSHLESS EXCITATION SYSTEM ELECTROMAGNETIC DESIGN AND ANALYSES." Journal of Energy - Energija 58, no. 5 (2022): 550–63. http://dx.doi.org/10.37798/2009585313.

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The brushless synchronous generator (SG) excitation system consists of a main exciter, a permanent magnet generator (PMG) of consequent rotor poles type, and an automatic voltage regulator (AVR). Both exciter machines have been properly designed and analysed. The machines performances are obtained by time stepping finite-element method (FEM) coupled with the external electrical circuit. An experimental machine is built and the measured results are given.

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Palka, Ryszard, Kamil Cierzniewski, Marcin Wardach, and Pawel Prajzendanc. "Research on Innovative Hybrid Excited Synchronous Machine." Energies 16, no. 18 (2023): 6600. http://dx.doi.org/10.3390/en16186600.

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This paper presents research on an unconventional electric machine. It is a hybrid excited machine which includes the features of three types of machines: the Permanent Magnet Synchronous Machine, the Synchronous Machine, and the Synchronous Reluctance Machine. Therefore, a broad literature review related to the above-mentioned types of machines was constructed. The well-known Permanent Magnet assisted Synchronous Reluctance Machine joins features of Permanent Magnet Synchronous Machine and Synchronous Reluctance Machine topologies. This paper shows the results of the innovative design of the Hybrid Excited Permanent Magnet assisted Synchronous Reluctance Machine, which additionally has advantages of the Synchronous Machine. In the article the basic methods of electromagnetic flux control and the designs using them are also presented. Finally, the results of simulation studies of the effect of the stator skew on the machine performance are described.

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5

YAMAMURA, Sakae. "SV theory of synchronous machine. Permanent-magnet-excited synchronous machine." Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences 74, no. 6 (1998): 122–25. http://dx.doi.org/10.2183/pjab.74.122.

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6

Wardach, Marcin, Pawel Prajzendanc, Ryszard Palka, et al. "Hybrid-Excited Permanent Magnet-Assisted Synchronous Reluctance Machine." Energies 15, no. 9 (2022): 2997. http://dx.doi.org/10.3390/en15092997.

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This paper presents the results of simulation tests of a unique hybrid-excited permanent magnet machine operating in in different working regimes. The common feature of analyzed machine is a presence of magnetic barriers in the rotor structure. Structurally, this machine combines the advantages of the PMa-SynRM machine (Permanent Magnet-assisted Synchronous Machine) and a wound synchronous machine. The paper presents, among other results, the voltage and torque characteristics as a function of the current in the stator and the additional DC control coil. Selected results of experimental studies are also shown.

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Cikač, Dominik, Nikola Turk, Neven Bulić, and Stefano Barbanti. "Flux Estimator for Salient Pole Synchronous Machines Driven by the Cycloconverter Based on Enhanced Current and Voltage Model of the Machine with Fuzzy Logic Transition." Machines 9, no. 11 (2021): 279. http://dx.doi.org/10.3390/machines9110279.

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Flux estimation is a key feature of the field-oriented control for the electrically excited synchronous machine which enables the high-performance, high-dynamic drive behavior. In this work, an electrically excited synchronous machine flux estimator based on a current and voltage model is proposed. In this case, the transition between the estimators is done with a fuzzy logic set of rules. The flux estimator based on the current model of the machine in this paper considers the saturation and cross-coupling effect in both axis and it is suitable for applications where a limited amount of the machine data is available. The flux estimator based on the voltage model is specially designed for the drives where high voltage and current ripple is present under normal operating conditions, e.g., like in cycloconverter applications. To exploit all the advantages of both models, a fuzzy logic transition is proposed based on multiple choices which manages the transition between the models based on a speed and torque reference. The proposed flux estimator is experimentally verified on a cycloconverter fed salient-pole electrically excited synchronous machine. The experimental results clearly show that the proposed flux estimator enables the accurate and stable operating conditions for different operating points of the cycloconverter-fed salient-pole electrically excited synchronous machine.

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8

Di Barba, Paolo, Maria Evelina Mognaschi, Michal Bonislawski, et al. "Hybrid excited synchronous machine with flux control possibility." International Journal of Applied Electromagnetics and Mechanics 52, no. 3-4 (2016): 1615–22. http://dx.doi.org/10.3233/jae-162190.

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9

Müller, Samuel, David Maier, and Nejila Parspour. "Inductive Electrically Excited Synchronous Machine for Electrical Vehicles—Design, Optimization and Measurement." Energies 16, no. 4 (2023): 1657. http://dx.doi.org/10.3390/en16041657.

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The demand for electric machines has been rising steadily for several years—mainly due to the move away from the combustion engine. Synchronous motors with rare earth permanent magnets are widely used due to their high power densities. These magnets are cost-intensive, cost-sensitive and often environmentally harmful. In addition to dispensing with permanent magnets, electrically excited synchronous machines offer the advantage of an adjustable excitation and, thus, a higher efficiency in the partial load range in field weakening operation. Field weakening operation is relevant for the application of vehicle traction drive. The challenge of this machine type is the need for an electrical power transfer system, usually achieved with slip rings. Slip rings wear out, generate dust and are limited in power density and maximum speed due to vibrations. This article addresses an electrically excited synchronous machine with a wireless power transfer onto the rotor. From the outset, the machine is designed with a wireless power transfer system for use in a medium-sized electric vehicle. As an example, the requirements are derived from the BMW’s i3. The wireless power transfer system is integrated into the hollow shaft of the rotor. Unused space is thus utilized. The overall system is optimized for high efficiency, especially for partial load at medium speed, with an operation point-depending optimization method. The results are compared with the reference permanent magnet excited machine. A prototype of the machine is built and measured on the test bench. The measured efficiency of the inductive electrically excited synchronous machine is up to 4% higher than that of the reference machine of the BMW i3.

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10

Yang, Hong Bing, Si Jia Yu, Ren Jie Yang, Yue Hong Dai, and Chuan Sheng Tang. "A New Hybrid Excited Magnetic Levitation Feeding Platform." Applied Mechanics and Materials 385-386 (August 2013): 772–76. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.772.

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Frictional resistance is an inherent problem to traditional feeding platforms of NC machine tools, while magnetic levitation is a good solution. The structure and operating principle of a magnetic levitation feeding platform based on the hybrid excited linear synchronous motor are proposed, and the FEA to the electromagnetic force and normal force of the motor is launched using Maxwell2D. To the problem of force ripple two optimization methods are adopted by simulating to prove the feasibilities of the direct driving by hybrid excited linear synchronous motors and the frictionless feeding of NC machine tools.

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Wardach, Marcin, Michal Bonislawski, Ryszard Palka, Piotr Paplicki, and Pawel Prajzendanc. "Hybrid Excited Synchronous Machine with Wireless Supply Control System." Energies 12, no. 16 (2019): 3153. http://dx.doi.org/10.3390/en12163153.

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The paper presents an unconventional approach to control the hybrid excited synchronous machine (HESM), which can be used for drives of pure electric vehicles. The hybrid excitation of the additional control coil placed on the rotor of the machine has been realized by the wireless energy transfer system connected with the rotor shaft. Experimental results of back-EMF characteristics obtained on a prototype of HESM were compared with 3-dimentional finite elements analysis (3D-FEA) predictions. This design, despite some additional complications in the power supply system of the machine, simplifies the mechanical construction and reduces the control coil’s losses compared to the construction with the coil placed on the stator.

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12

Johann, Olaf, and Johannes Müller. "Separately excited synchronous machine potentials in E-motor development." ATZelektronik worldwide 8, no. 4 (2013): 30–33. http://dx.doi.org/10.1365/s38314-013-0184-8.

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13

Di Barba, Paolo, Michal Bonislawski, Ryszard Palka, Piotr Paplicki, and Marcin Wardach. "Design of Hybrid Excited Synchronous Machine for Electrical Vehicles." IEEE Transactions on Magnetics 51, no. 8 (2015): 1–6. http://dx.doi.org/10.1109/tmag.2015.2424392.

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14

Bliss, D. N., and D. Midgley. "The synchronous induction machine as an electronically excited alternator." Electric Power Systems Research 10, no. 1 (1986): 21–24. http://dx.doi.org/10.1016/0378-7796(86)90045-3.

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15

Paplicki, Piotr. "A novel rotor design for a hybrid excited synchronous machine." Archives of Electrical Engineering 66, no. 1 (2017): 29–40. http://dx.doi.org/10.1515/aee-2017-0003.

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Abstract The paper presents three novel rotor design concepts for a three-phase electric controlled permanent magnet synchronous machine (ECPMS-machine) with hybrid excitation. The influence of magnets and flux-barriers arrangement on the magnetic field distribution and field-weakening characteristics of the machine is examined, based on a three-dimensional finite element analysis (3D-FEA). Moreover, a prototype rotor design based on a new rotor concept with a good field-weakening capability is presented in detail. Finally, the experimental results of no-load back electromotive force (back-EMF) waveforms and field-weakening characteristics versus a control coil current of the machine are reported.

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16

Tamura, Junji, Toshiaki Murata, Ikuo Takeda, Jun Hasegawa, and Hajime Fujiwara. "Steady state stability analysis on an AC excited synchronous machine." IEEJ Transactions on Power and Energy 105, no. 7 (1985): 605–12. http://dx.doi.org/10.1541/ieejpes1972.105.605.

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17

Marignetti, Fabrizio, Roberto Luigi Di Stefano, Guido Rubino, and Paolo Conti. "Development and Laboratory Testing of a Self-Excited Synchronous Machines without Permanent Magnets." Energies 13, no. 15 (2020): 3966. http://dx.doi.org/10.3390/en13153966.

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Today, self-excited synchronous machines are the object of increasing interest because they use neither brushes nor permanent magnets. In fact, the price of rare earth metals is considerably high and still raising. This is the main reason why researchers are looking for suitable alternatives to permanent magnets in the construction of rotating electrical machinery. This paper deals with the design and laboratory testing of a synchronous machine with an efficient layout and an economic construction. The proposed self-excited machine exploits the space harmonics of the magneto-motive force to produce the excitation field. The model analysis is based on the computation of the back EMFs that are associated to the magneto motive force components. The mathematical model suggests an easy way to decouple the rotor windings. The machine has been built and experimental tests have been performed in order to validate the electrical behavior.

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18

Enemor, C. G., D. C. Idoniboyeobu, and S. L. Braide. "Performance Analysis of Synchronous Reluctance Generator." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (2022): 765–74. http://dx.doi.org/10.22214/ijraset.2022.41501.

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Abstract: The synchronous reluctance generators are a species of self-excited generators such as the induction generators. The self-excited synchronous reluctance generator (SynRG) has become a promising and viable replacement of self-excited induction generator because of the supply frequency dependence on the prime speed and not load. The self-excited synchronous reluctance generator has high reliability, low cost and robustness and capacity of variable speed operation. The aim of this research is to carry out performance analysis of shunt connected three-phase synchronous reluctance generator feeding an R-L load. The dynamic analysis is based on the classical d-q model where equations for electrical quantities were derived and implemented using a computer simulation tool, MATLAB®. The equations for steady state analysis were derived from the dynamic equations by setting all time variables to zero. The dynamic analysis was carried out on a 4-pole, speed of 1500 rpm with connected load at a fixed excitation capacitor value of 50uF for a 2.5kVA machine. Effect of excitation-capacitance variation and loadingconditions variation on the generated output voltage and frequency are presented and discussed. The load variations were done based on energy-current perturbation at a fixed power factor of 1.0. The load variations were done at several points and result shows that with the variations in the connected loads, the output frequency of the synchronous reluctance generator remains constant, which makes it a good alternative for induction generator. On the steady state analysis, it was discovered that on increasing the excitation capacitor, the terminal voltage increases as well as the output power. The result specifically revealed that when the capacitance increases from 25uF to 45uF, the terminal voltage and the output power increases from 200volts to 300volts; and 200watt to 1700watt. Therefore, it is recommended that to ensure machine excitation, the capacitor should not be reduced below a certain value. The study is beneficial for operation of an isolated power supply. Keywords: Synchronous Reluctance Generator, Direct Current and Indirect Current

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19

May, H., R. Palka, P. Paplicki, S. Szkolny, and W. R. Canders. "Modified concept of permanent magnet excited synchronous machines with improved high-speed features." Archives of Electrical Engineering 60, no. 4 (2011): 531–40. http://dx.doi.org/10.2478/v10171-011-0043-2.

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Modified concept of permanent magnet excited synchronous machines with improved high-speed features Permanent magnet (PM) excited synchronous machines used in modern drives for electro-mobiles suffer in high speed regions from the limited battery-voltage. The field weakening requires designing machines with reduced power conversion properties or increasing the size of the power converter. A new concept of such a machine features PM excitation, single-tooth winding and an additional circumferential excitation coil fixed on the stator in the axial center of the machine. By the appropriate feeding of this coil, the amplitude of the voltage effective excitation field can be varied from zero to values above those of the conventional PM-machines. The capability of reducing the excitation field to zero is an important safety aspect in case of failing of the feeding convertor.

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20

El Akhrif, Rachid, Ahmed Abbou, Chaymae Laoufi, and Mohamed Ferfra. "dSPACE implementation for a proportional–integral-based root mean square voltage controller used in stand-alone wind energy conversion systems." Wind Engineering 43, no. 4 (2018): 404–19. http://dx.doi.org/10.1177/0309524x18791384.

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The induction machine and the synchronous machine are very promising in renewable energy production for uses in wind turbines to produce energy in remote areas, and we note that self-excited induction generator is more adapted due to difficult geographical conditions and best cost; on the other hand, permanent magnet synchronous generator works without any excitation system; all of these have a major problem in use which is the stability of voltage. To solve this problem, we propose in this article the examination of a control plot for keeping the produced root mean square voltage steady. This article presents an experimental comparative study of performances in terms of root mean square voltage on two possible small wind turbine systems. One of the systems is based on permanent magnet synchronous generator and the other is based on self-excited induction generator. Taking into account the parameters of load and wind speed, experimental test benches for both systems are implemented using the dSPACE card for controlling the pulse width modulation inverter to impose the Vrms value of the desired output voltage.

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21

Bounadja, Mohamed, Ahmed W. Belarbi, and Bachir Belmadani. "Vector Control of Double Excited Synchronous Machine as Integrated Starter-Alternator." Automatika 55, no. 4 (2014): 455–62. http://dx.doi.org/10.7305/automatika.2014.12.542.

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Nonaka, S., and T. Kawaguchi. "Excitation scheme of brushless self-excited-type three-phase synchronous machine." IEEE Transactions on Industry Applications 28, no. 6 (1992): 1322–29. http://dx.doi.org/10.1109/28.175284.

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23

Afanasyev, Aleksandr A., and Evgenii G. Paimurzov. "A SENSORLESS CONTROL METHOD OF THYRISTOR STATICAL FREQUENCY CONVERTER FOR STARTING SYNCHRONOUS MACHINE." Vestnik Chuvashskogo universiteta, no. 2 (June 30, 2023): 41–54. http://dx.doi.org/10.47026/1810-1909-2023-2-41-54.

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Relevance of study. Starting of the medium voltage synchronous machine at standstill is one of the main problems in the operation of unregulated synchronous electric drives. The optimal solution is starting the excited synchronous machine fed by the thyristor statical frequency converter. A sensorless control of the statical frequency converter for thyristor switching of load-commutated inverter to functions of synchronous machine angular rotor position in the area of zero and low speed, has not yet received a clear solution.  The purpose of this study is the design of the sensorless control method for the thyristor statical frequency converter at the synchronous machine startup under conditions of angular acceleration uncertainty.  Materials and methods. Methods of theory of electrical machines and computer mathematical simulation are used in the study.  Results of the study. The regularity between the angular rotor position and the non-conductive phase stator voltage of the synchronous machine is determined. The rotor rotation angle of the synchronous machine is defined as the ratio of the conductive state duration of the thyristor arm pair of the load-commutated inverter to the period determined from the non-conductive phase stator voltage of the synchronous machine. The sensorless control method is based on simultaneous operation of scalar control, indirect angular rotor position determination and cross-control channels. The proposed sensorless control method is tested by computer mathematical simulation of the system «thyristor statical frequency converter –synchronous machine».  Findings. The application of the considered control method was found for commercially available medium voltage thyristor frequency converters of EKRA Ltd. The considered method can be used for the sensorless control of frequency converter by different topology.

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Mbo’O, Christelle Piantsop, and Kay Hameyer. "An extended dynamic thermal model of a permanent magnet excited synchronous motor." Archives of Electrical Engineering 62, no. 3 (2013): 375–86. http://dx.doi.org/10.2478/aee-2013-0030.

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Abstract The purpose of this paper is to develop a dynamic thermal model of a permanent magnet excited synchronous motor (PMSM). The model estimates the temperature at specific points of the machine during operation. The model is implemented using thermal network theory, whose parameters are determined by means of analytical approaches. Usually thermal models are initialized and referenced to room temperature. However, this can lead to incorrect results, if the simulations are performed when the electrical machine operates under “warm” conditions. An approach is developed and discussed in this paper, which captures the model in critical states of the machine. The model gives feedback by online measured quantities to estimate the initial temperature. The paper provides an extended dynamic thermal model, which leads to a more accurate and more efficient thermal estimation.

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Mondal, Amit Kumar, Saptarshi Basak, and Chandan Chakraborty. "Excitation Control of Brushless Induction Excited Synchronous Motor with Induction Machine Operating in Deep-Plugging Mode." Power Electronics and Drives 9, no. 1 (2024): 257–71. http://dx.doi.org/10.2478/pead-2024-0017.

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Abstract The popularity of electrified transportation is rising at a sharp pace due to environmental concerns over internal combustion (IC) engines. Researchers are nowadays looking for a brushless and permanent magnet (PM)-less solution for electric vehicle (EV) motors. Wound-field synchronous motor (WFSM) is a potential solution for EVs and is being used in Renault Zoe EV and BMW iX3 e-Drive models. A Brushless Induction excited Synchronous Motor (BINSYM) is a WFSM where the exciter, an induction machine (IM), is embedded inside the synchronous machine (SM) frame. Two machines (SM and IM) are configured for different numbers of poles to achieve magnetic decoupling, which facilitates independent control of both machines. The purpose of IM is to maintain the excitation requirement of SM. The IM is controlled in deep-plugging mode at a constant slip frequency over the entire speed range to minimise its reactive power demand. The maximum torque per ampere (MTPA) and root mean square (rms) current minimisation algorithms are used to control the SM. Simulation of the BINSYM-based system under dynamic conditions (MTPA with varying field current and load transient) has been carried out in MATLAB/Simulink to validate the control strategies. Experimental findings from the laboratory prototype machine closely match the simulation results.

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Di Barba, Paolo, Maria Evelina Mognaschi, Ryszard Palka, Piotr Paplicki, and Sebastian Szkolny. "Design optimization of a permanent-magnet excited synchronous machine for electrical automobiles." International Journal of Applied Electromagnetics and Mechanics 39, no. 1-4 (2012): 889–95. http://dx.doi.org/10.3233/jae-2012-1556.

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Rao, Yalla Tirumala, Chandan Chakraborty, and Saptarshi Basak. "Brushless Induction Excited Synchronous Generator With Induction Machine Operating in Plugging Mode." IEEE Transactions on Industry Applications 54, no. 6 (2018): 5748–59. http://dx.doi.org/10.1109/tia.2018.2847299.

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Zhyhylii, Serhii, Maksym Kharchenko, and Julia Katella. "Mathematical Model of the Dynamic Action of the Controlled Vibration Exciter on the Processed Medium of Mixer with Toroidal Working Container." International Journal of Engineering & Technology 7, no. 3.2 (2018): 478. http://dx.doi.org/10.14419/ijet.v7i3.2.14576.

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Vibration mixers are technological machines that are meant for mixing of different processed medium. A driving force in such machines is realizing by oscillation exciter. In this article, the constructive scheme of the vibration mixer is introduced. Such a mixer has the toroidal working container and is equipped with controlled mechanical centrifugal unbalanced exciters of oscillations with a vertically located unbalanced shaft. The work principle of one of the possible configurations in this exciter is considered and provided. One inflexible and two mobile unbalances are strengthen on its unbalanced shaft. The mobile unbalances by means of independent external action, that is caused by mechanism for managing of mobile unbalances, have an opportunity to change synchronously its positions on the unbalanced shaft directly in time of mixer’s work. The centrifugal inertia forces of inflexible and mobile unbalances make the dynamic wrench that consists of the main vector                     and the main moment   and rotates with unbalanced shaft. It is determined that the value of the main vector   and the main moment   evaluate the dynamic action of this vibration exciter to the mixer’s working container. The mathematical model of the dynamic action of oscillator exciter on the processed medium of mixer with the toroidal working container is received. Depending on the value of turn angle of mobile unbalances from its starting positions exciter: a) staying in the dynamic balance state; b) is generating the translation force field; c) generates the wrench force field of this or that direction. These opportunities of controlled vibration exciter firmly provide anfractuous circulative motion of the processed medium on the volume of the mixer’s working container. Using of controlled exciter also leaves out the transfers through intermediate resonance frequencies. As its starting and stopping happen in a dynamic balance state, so it leaves out the possibility of manifestation of the “Sommerfeld’s effect” that is harmful for the driven motor, improves the constructive availability of the vibration mixer and increases its efficiency and life duration.

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Krištof, Vladimír, and Marián Mešter. "Loss of excitation of synchronous generator." Journal of Electrical Engineering 68, no. 1 (2017): 54–60. http://dx.doi.org/10.1515/jee-2017-0007.

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Abstract This paper presents results of study of loss-of-excitation phenomena simulations. Loss of excitation is a very common fault in synchronous machine operating and can be caused by short circuit of the field winding, unexpected field breaker open or loss-of-excitation relay mal-operation. According to the statistic [1], the generator failure due to loss-of-excitation accounts for 69% of all generator failures. There has been concern over possible incorrect operation of the relay when operating the generator in the under-excited region, during stable transient swings and during major system disturbances. This article can serve as inputs for system operators in preparation of operation area or protection relaying area.

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Paplicki, Piotr, Marcin Wardach, Michał Bonisławski, and Ryszard Pałka. "Simulation and experimental results of hybrid electric machine with a novel flux control strategy." Archives of Electrical Engineering 64, no. 1 (2015): 37–51. http://dx.doi.org/10.1515/aee-2015-0005.

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Abstract The paper presents selected simulation and experimental results of a hybrid ECPMS-machine (Electric Controlled Permanent Magnet Synchronous Machine). This permanent magnets (PMs) excited machine offers an extended magnetic field control capability which makes it suitable for battery electric vehicle (BEV) drives. Rotor, stator and the additional direct current control coil of the machine are analyzed in detail. The control system and strategy, the diagram of power supply system and an equivalent circuit model of the ECPMS-machine are presented. Influence of the additional excitation on the performance parameters of the machine, such as: torque, efficiency, speed limits and back-EMF have also been discussed.

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Manko, Roman, Mario Vukotić, Danilo Makuc, Danijel Vončina, Damijan Miljavec, and Selma Čorović. "Modelling of the Electrically Excited Synchronous Machine with the Rotary Transformer Design Influence." Energies 15, no. 8 (2022): 2832. http://dx.doi.org/10.3390/en15082832.

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An electrically excited synchronous machine (EESM) is a promising alternative to the permanent magnets synchronous machines being used in the automotive industry. However, the main disadvantage of the EESM with the conventional excitation system with brushes is the presence of slip rings on the shaft, which need regular maintenance. A promising alternative to the conventional excitation system of the EESM is a wireless power transfer (WPT) system. In this paper, we focused on WPT excitation system based on the rotary transformers. First, the model of the EESM in the d-q reference frame with vector control system has been built (based on the parameters of the real machine) and analyzed using MATLAB/Simulink software. Second, the influence of the rotary transformer design parameters on the dynamic performance of the EESM has been investigated. Finally, different topologies of the rotary transformers found in the literature have been analyzed, modeled and compared using an analytical and numerical approach. Based on the obtained results, the most suitable electrical parameters (i.e., geometry parameters, supply frequency, magnetizing and leakage inductance, winding resistance and efficiency) of the rotary transformer have been identified and implemented into the d-q model of EESM.

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Palka, Ryszard. "Synthesis of Application-Optimized Air Gap Field Distributions in Synchronous Machines." Energies 15, no. 7 (2022): 2322. http://dx.doi.org/10.3390/en15072322.

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This paper deals with the method of shaping the magnetic field distribution in the air gap of a synchronous machine. The main goal is to obtain a specific distribution of the magnetic field in the machine’s air gap to enable easier powering, to increase the torque and power density, or to limit the content of higher harmonics in the induced voltage and torque. This method can be applied for both the electrically excited machines and permanent magnets excited machines. The problem has been reduced to solving a modified system of algebraic equations obtained by the finite element method. The presented examples show the effectiveness of the proposed method both in shaping the contours of the air gap and the magnetization of permanent magnets placed on the rotor. The method can particularly be used in the design of the high-speed synchronous machines.

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33

Fodorean, Daniel, Abdesslem Djerdir, Ioan-Adrian Viorel, and Abdellatif Miraoui. "A Double Excited Synchronous Machine for Direct Drive Application—Design and Prototype Tests." IEEE Transactions on Energy Conversion 22, no. 3 (2007): 656–65. http://dx.doi.org/10.1109/tec.2007.896279.

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34

TUDORACHE, TIBERIU. "FINITE ELEMENT ANALYSIS OF A FLEXIBLE DUAL-SPEED SALIENT POLE SYNCHRONOUS MACHINE." REVUE ROUMAINE DES SCIENCES TECHNIQUES — SÉRIE ÉLECTROTECHNIQUE ET ÉNERGÉTIQUE 70, no. 1 (2025): 21–26. https://doi.org/10.59277/rrst-ee.2025.1.4.

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This paper deals with the performance analysis of a DC-excited dual-speed synchronous machine (DSSM) with salient poles equipped with a damper winding. The proposed DSSM can operate at two speeds when connected to the mains. The number of pole pairs can be adjusted while running by the special design of the stator and rotor windings, which can commute between p = 1 and p = 2 pole pairs (by adjusting simultaneously the stator and rotor coil connections). The presence of the damper winding is helpful for the machine to self-start when directly connected to the grid as a motor and to pass smoothly from one speed to the other. The 2D finite element computations used to estimate the machine transient regimes and to determine its specific characteristics were carried out using the professional software package Flux® dedicated to electromagnetic field analysis. The proposed machine was analyzed both as a motor and as a generator.

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35

Pirmatov, N. B., A. M. Egamov, C. M. Giyasov, et al. "Some aspects of comparing the operational properties of synchronous machines with a conventional and two mutually shifted excitation windings." E3S Web of Conferences 401 (2023): 03056. http://dx.doi.org/10.1051/e3sconf/202340103056.

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A comparative analysis of the operational properties of traditional and two-valve synchronous machines with a rotor, having a reciprocating axis, excited from independent regulated DC sources, is generalized. On the basis of research, it has been shown that the use of a control quadrature excitation winding significantly improves the performance of synchronous machines at low costs for its manufacture. The authors have shown a significant improvement in the performance of machines with different operating modes based on the results of theoretical and experimental studies carried out on synchronous machines with a rotating axis of magnetic saturation, attached to various designs of quadrature excitation winding. It has been recognized that neglecting magnetic saturation in performance calculations for synchronous machines leads to significant estimation errors properties of the studied machine. In addition, the advantages of synchronous machines with sine-cosine field winding are shown. With an insignificant complication of the manufacturing technology, it opens the way to solving the problem of creating energy-saving turbine generators, which have a property that is very important for the practice of operation, i.e. an almost unchanged (sinusoidal) shape of the resulting magnetic field in the air gap of the machine within the allowable range of load variation under steady-state symmetric modes.

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Sun, Xiaoyong, Ruizhao Han, Ruyu Shang, and Zhiyu Yang. "Influence of Hybridization Ratio on Field Back-EMF Ripple in Switched Flux Hybrid Excitation Machines." Machines 13, no. 6 (2025): 473. https://doi.org/10.3390/machines13060473.

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Hybrid excited machines are strong competitors for application in hybrid/full electric vehicles due to their high torque density and strong air gap field-regulating capability. Similar to armature back-EMF, back-EMF also exists in the field windings of hybrid excited machines. However, the existence of field back-EMF is harmful to the safe and stable operation of machine systems, e.g., lower efficiency, higher torque ripple, reduced control performance, etc. In this paper, the influence of the hybridization ratio k, i.e., the ratio of the field winding slot area to the total field slot area, on the field back-EMF in hybrid excited machines with a switched flux stator is comprehensively investigated. In addition, a comparative study of the field back-EMF ripple in hybrid excited machines and wound field synchronous machines is conducted. It shows that the field back-EMF in flux-enhancing, zero field current, and flux-weakening modes is significantly affected by the hybridization ratio under different conditions. Moreover, the on-load field back-EMF in wound field machines is considerably higher than that in hybrid excited machines due to the mitigated magnetic saturation level in the field winding’s magnetic flux path. Finally, to validate the results predicted using the finite element method, a prototype hybrid excited machine is built and tested.

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37

Park, Ji-San, and Jin-Kyu Byun. "Multi-objective Optimization of Slipring-less Winding Excited Synchronous Machine Using Weighted Sum Method." Journal of the Korean Magnetics Society 32, no. 1 (2022): 32–38. http://dx.doi.org/10.4283/jkms.2022.32.1.032.

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38

Abo-Shady, S. E., F. I. Ahmed, and S. M. El-Hakim. "Analysis of self-dual excited synchronous machine. II. Small perturbation model and dynamic behaviour." IEEE Transactions on Energy Conversion 3, no. 2 (1988): 315–22. http://dx.doi.org/10.1109/60.4736.

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39

Afinowi, I. A. A., Z. Q. Zhu, Y. Guan, J. C. Mipo, and P. Farah. "Hybrid-Excited Doubly Salient Synchronous Machine With Permanent Magnets Between Adjacent Salient Stator Poles." IEEE Transactions on Magnetics 51, no. 10 (2015): 1–9. http://dx.doi.org/10.1109/tmag.2015.2446951.

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40

Maier, Marcel, and Nejila Parspour. "Operation of an Electrical Excited Synchronous Machine by Contactless Energy Transfer to the Rotor." IEEE Transactions on Industry Applications 54, no. 4 (2018): 3217–25. http://dx.doi.org/10.1109/tia.2018.2814558.

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41

Long, Qingwen, Zhiqing Zhou, Xiaohui Lin, and Jianshang Liao. "Investigation of a novel brushless electrically excited synchronous machine with arc-shaped rotor structure." Energy Reports 6 (December 2020): 608–17. http://dx.doi.org/10.1016/j.egyr.2020.11.179.

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42

Tanaka, Akira, Shu Yamamoto, Takahiro Ara, Kazuto Sakai, and Shuji Komuro. "Equivalent Circuit Constants of Synchronous Machine Using Frequency Characteristics of Operational Impedances and Application to Brushless-Excited Machine." IEEJ Transactions on Industry Applications 137, no. 3 (2017): 256–66. http://dx.doi.org/10.1541/ieejias.137.256.

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43

Chai, Wenping, and 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, no. 1-4 (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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44

Zhou, Jiawei, Ming Cheng, Wenfei Yu, and Wei Hua. "Analysis of Torque Ripple in V-Shape Interior Permanent Magnet Machine Based on General Airgap Field Modulation Theory." Energies 16, no. 12 (2023): 4586. http://dx.doi.org/10.3390/en16124586.

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This paper proposes a novel torque ripple model of V-Shape interior permanent magnet (IPM) synchronous machine based on the general field modulation theory (GAFMT). Firstly, the magnetic field modulation behavior of a 12-stator-slot/8-rotor-pole (12/8) IPM machine is discussed, where the expressions of permanent-magnet-excited (PM-excited) and armature fields are derived. Secondly, the total torque ripple is divided into three components, namely, the PM-excited cogging torque, the armature cogging torque, and the modulation torque ripple. Additionally, the relationship between the field harmonics and the torque ripple is discussed based on the GAFMT. Then, a finite element analysis (FEA)-assisted dual fast Fourier transformation (FFT) method is proposed to obtain the accurate value of the field amplitude for torque ripple calculation. The field analysis results based on the GAFMT and the proposed torque ripple are then validated by comparing their results with those obtained from the FEA simulations, and a good agreement is observed, demonstrating the effectiveness of the field analysis and the proposed torque ripple model. Finally, experiments on a prototype 12/8 IPM machine demonstrate the validity of the torque ripple model, providing an effective method for torque ripple suppression of IPM machines.

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45

Subramanian, K., and S. P. Sabberwal. "Cost Effective Wind Energy Conversion Scheme Using Self-Excited Induction Generator." Advanced Materials Research 768 (September 2013): 143–50. http://dx.doi.org/10.4028/www.scientific.net/amr.768.143.

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This paper describes a laboratory model of a wind energy conversion scheme (WECS) using conventional cage rotor type induction motor of 3Hp, 3-Ø, 415V, 4.9A, 1440 rpm. A 220V, 20A separately excited motor coupled with the induction motor emulates the wind turbine characteristics. A 3-Ø, 415 V capacitor bank of 150μF is connected in each phase across the stator terminals of the machine for its self-excitation. As soon as rotor speed exceeds synchronous speed of the machine, it will generate electrical power and reach its rated value. This arrangement is called as self-excited induction generator (SEIG). To control the frequency of generated voltage, load-balancing technique is considered by using a three-phase diode rectifier powering to an additional load (dump load) through a d.c chopper circuit. Static reactive volt-ampere compensator (STATCOM) is used to mitigate the load reactive power requirement indeed magnetic reactance changes in the machine. Owing to cost optimization of STATCOM, additional reactor is connected across the stator terminals of the SEIG. Simulation study is completed using power system toolbox Matlab / Simulink version9.0. Experimental and simulation results are presented.

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46

Ijeoma Obe, Pauline, Lilian Livutse Amuhaya, Emeka Simon Obe, and Adamu Murtala Zungeru. "Performance of Synchronous Reluctance Generators with Series and Shunt Stator Connections." International journal of electrical and computer engineering systems 14, no. 5 (2023): 589–92. http://dx.doi.org/10.32985/ijeces.14.5.10.

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This paper reports the performance of series- and shunt-connected self-excited reluctance generators (SERG). In addition to the two stator connections, an analysis was carried out on rotor configurations (with and without a cage) a combination resulting in four different generator topologies. The loss of load and transient characteristics of each generator configuration were studied for a combination of pure resistive and R-L loads. It is shown that for the same machine size, speed and exciting capacitor value, the generator with a cage preserves a better wave shape following a transient disturbance than the cageless machine. At unity power factor, shunt generator with cage can deliver 0.691pu output power, at 1.97% regulation; its series counterpart only delivers 0.589 pu at 2.05%. The study demonstrates that while shunt generators have better regulation and supports higher loads at different power factors, series generators show a superior performance in terms of damping out transients.

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47

Mohanty, Alok Kumar, and K. B. Yadav. "Estimation of excitation capacitance requirement of an isolated multi-phase induction generator for power generation." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 2 (2016): 561. http://dx.doi.org/10.11591/ijpeds.v7.i2.pp561-567.

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<table width="593" border="1" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" width="387"><p> </p><p>Self Excited induction generators are used in remote places for electrical power generation from both conventional as well as non-conventional sources. An Induction generator can operate as a capacitor excited machine provided the machine is driven beyond synchronous speed and a suitable capacitor is connected across its terminals. In this paper a technique has been proposed to estimate the values of excitation capacitances to maintain desired terminal voltages in a multi-phase induction generator. A mathematical model using nodal admittance technique of a six-phase induction generator has been analyzed. Genetic algorithm technique is applied here to obtain the unknown parameters and the capacitance requirements to obtain desired terminal voltages under various operating conditions.</p></td></tr></tbody></table>

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48

Nonaka, S., and T. Kawaguchi. "A new variable-speed AC generator system using a brushless self-excited-type synchronous machine." IEEE Transactions on Industry Applications 28, no. 2 (1992): 490–96. http://dx.doi.org/10.1109/28.126760.

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49

Zhang, Fengge, Guanglong Jia, Yunwu Zhao, Zheng Yang, Wenping Cao, and James L. Kirtley. "Simulation and Experimental Analysis of a Brushless Electrically Excited Synchronous Machine With a Hybrid Rotor." IEEE Transactions on Magnetics 51, no. 12 (2015): 1–7. http://dx.doi.org/10.1109/tmag.2015.2450684.

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Zheng, M., Z. Q. Zhu, S. Cai, and S. S. Xue. "A Novel Modular Stator Hybrid-Excited Doubly Salient Synchronous Machine With Stator Slot Permanent Magnets." IEEE Transactions on Magnetics 55, no. 7 (2019): 1–9. http://dx.doi.org/10.1109/tmag.2019.2902364.

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