Journal articles: 'Brushless exciter'

1

Kabir, S. M. L. "Brushless exciter model." IEE Proceedings - Generation, Transmission and Distribution 141, no. 1 (1994): 61. http://dx.doi.org/10.1049/ip-gtd:19949704.

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S, Pranupa, Kiran Kumar B M, and S. Nagaraja Rao. "Detection of Rotating Diode Failure Condition & its Protection in Brushless Alternator." International Journal of Engineering & Technology 7, no. 4.24 (November 27, 2018): 26. http://dx.doi.org/10.14419/ijet.v7i4.24.21765.

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Brushless excitation system is widely used in large capacity synchronous generators since it removes the usage of commutator, brushes and slip rings, hence reduces the losses, maintenance and increases reliability. Rotating Rectifier Assembly (RRA) is the main part of brushless alternator. Due to ageing phenomenon and continuous process regime, diodes in rotating rectifier can fail either due to Open Circuit (OC) or Short Circuit (SC), which overloads the exciter and hence the alternator can no longer run securely. If such condition is prolonged, the Automatic Voltage Regulator (AVR) as well as the exciter windings can be damaged.This paper presents two different methods of diode failure detection in brushless alternators. First method uses an algorithm based on output voltage and the second uses the ripple factor of the exciter field current. Diode failure condition is detected for different type of loads connected to 4 kVA, 380 V, 50 Hz, 4 poles generator with 14 pole exciter (brushless alternator) and the results are verified using MATLAB/Simulink. Also, the protection schemes for rotating diode assembly as well as exciter field windings are presented using Metal Oxide Varistor (MOV) and Discharge Resistor.

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Jia, X., Qingfu Li, Jih-Sheng Lai, and Byeong-Mun Song. "Analysis of polyphase brushless exciter." IEEE Transactions on Industry Applications 37, no. 6 (2001): 1720–26. http://dx.doi.org/10.1109/28.968183.

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4

Chouaba, S. E., and A. Barakat. "Controlled Brushless De-Excitation Structure for Synchronous Generators." Engineering, Technology & Applied Science Research 9, no. 3 (June 8, 2019): 4218–24. http://dx.doi.org/10.48084/etasr.2768.

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The main weakness of the brushless excitation system in a synchronous generator (SG) is the slow de-excitation response obtained during a load rejection. That is why voltage overshoots may be observed on the generator terminals. This behavior is mainly due to the exciter machine response time and the rotating diode bridge which is not able to quickly de-excite the generator by negative excitation voltages. This paper presents a new brushless de-excitation structure able to perform a quick de-excitation of the generator by providing controlled negative excitation voltage to the generator main field winding. The proposed structure is based on a new brushless de-excitation machine, called a control machine, and mounted on the same shaft of the generator and the brushless exciter. The brushless control machine is a low power one and used to transfer the orders from the voltage regulator to the discharge system located on the rotor side of the main generator. The dynamic performance of the proposed de-excitation system is evaluated in terms of system stability, voltage regulation response times and voltage overshoots during different load rejection tests. The proposed system is compared to the conventional brushless excitation system without the proposed de-excitation structure. In addition, a comparison is done with the static excitation system. The simulation tests are realized on an experimentally validated model of 11kVA synchronous generator developed in Matlab/Simulink.

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Inoue, Kenji, Hideo Yamasita, Eihachiro Nakamae, and Takayuki Fujikawa. "Brushless Self-Excited Three-Phase Synchronous Generator without Exciter." IEEJ Transactions on Industry Applications 112, no. 6 (1992): 569–78. http://dx.doi.org/10.1541/ieejias.112.569.

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Inoue, Kenji, Hideo Yamashita, Eihachiro Nakamae, and Takayuki Fujikawa. "Brushless self-excited three-phase synchronous generator without exciter." Electrical Engineering in Japan 113, no. 8 (1993): 101–15. http://dx.doi.org/10.1002/eej.4391130810.

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7

Livio Šušnjić. "BRUSHLESS EXCITATION SYSTEM ELECTROMAGNETIC DESIGN AND ANALYSES." Journal of Energy - Energija 58, no. 5 (September 19, 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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8

Nonaka, Sakutaro, and Katsumi Kesamaru. "Brushless three-phase synchronous generator without exciter." IEEJ Transactions on Power and Energy 105, no. 10 (1985): 851–58. http://dx.doi.org/10.1541/ieejpes1972.105.851.

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9

Shibata, Fukuo, Nobuyuki Naoe, and Tadashi Fukami. "Brushless Synchronous Machine Having Function of Exciter." JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN 27, no. 7 (1992): 538–42. http://dx.doi.org/10.5988/jime1966.27.538.

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10

Smith, I. R., J. G. Kettleborough, and T. C. Kok. "Brushless and current-compounded frequency-convertor exciter." IEE Proceedings B Electric Power Applications 133, no. 1 (1986): 7. http://dx.doi.org/10.1049/ip-b.1986.0002.

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11

Abdel-Halim, Mohammed A. "Transfer Function Model of a Brushless Exciter." Journal of King Saud University - Engineering Sciences 9, no. 2 (1997): 221–37. http://dx.doi.org/10.1016/s1018-3639(18)30678-0.

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12

Chakraborty, Chandan, Saptarshi Basak, and Yalla Tirumala Rao. "Synchronous Generator With Embedded Brushless Synchronous Exciter." IEEE Transactions on Energy Conversion 34, no. 3 (September 2019): 1242–54. http://dx.doi.org/10.1109/tec.2019.2900341.

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13

Nonaka, Sakutaro, and Katsumi Kesamaru. "Brushless three-phase synchronous generator without exciter." Electrical Engineering in Japan 105, no. 6 (1985): 91–99. http://dx.doi.org/10.1002/eej.4391050611.

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14

Mahtani, Kumar, José M. Guerrero, Luis F. Beites, and Carlos A. Platero. "Model-Based Field Winding Interturn Fault Detection Method for Brushless Synchronous Machines." Machines 10, no. 12 (December 15, 2022): 1227. http://dx.doi.org/10.3390/machines10121227.

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The lack of available measurements makes the detection of electrical faults in the rotating elements of brushless synchronous machines particularly challenging. This paper presents a novel and fast detection method regarding interturn faults at the field winding of the main machine, which is characterized because it is non-intrusive and because its industrial application is straightforward as it does not require any additional equipment. The method is built upon the comparison between the theoretical and the measured exciter field currents. The theoretical exciter field current is computed from the main machine output voltage and current magnitudes for any monitored operating point by means of a theoretical healthy brushless machine model that links the main machine with the exciter. The applicability of the method has been verified for interturn faults at different fault severity levels, both through computer simulations and experimental tests, delivering promising results.

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15

Fan, Wei, Yiqun Fang, Yuanyuan Yang, Xiangsheng Liu, and Xiutao Ji. "Research on the Brushless Excitation System with Linear Current Amplifier Characteristics." Mathematical Problems in Engineering 2022 (August 2, 2022): 1–11. http://dx.doi.org/10.1155/2022/9271302.

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In terms of improving the dynamic response characteristics of brushless AC synchronous generators, the concept of integrated design of AC exciter and rotating rectifier and their electromagnetic characteristics are studied, and the conditions and judgment methods for determining their operating modes are obtained in theoretical design and simulation design, pointing out that when the brushless excitation system operates in or is close to mode III, i.e., the rectifier always has three or four diodes in each operating cycle. The linear current amplifier characteristics can be basically achieved when the brushless excitation system is operated in mode III or is close to mode III, i.e., the rectifier always has three or four diodes alternating in each operating cycle. The impact of the key parameters of the AC exciter at different rotational speeds and temperatures on the characteristics of the linear current amplifier was explored, and an engineering prototype was manufactured. The related test verified the correctness of the concept of integrated electromagnetic design and simulation calculation. This study provides an engineered design method for enhancing the dynamic response properties of the brushless AC synchronous generators.

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Chubraeva, Lidia, Evgeniy Evseev, Sergei Timofeyev, Michail Turubanov, Dimitry Volkov, and Sergei Soleniy. "Brushless Exciter Based on Nanomaterials for 1 MVA HTSC Wind Power Alternator." Materials Science Forum 856 (May 2016): 38–43. http://dx.doi.org/10.4028/www.scientific.net/msf.856.38.

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The paper is devoted to testing of a brushless exciter intended for a 1 MVA high-temperature superconductive (HTSC) synchronous generator. It was decided to make a ambient-temperature version on the 1-st stage with a latter transaction to a cryogenically-cooled version. The exciter incorporates a number of nanomaterials: rare-earth Nd-Fe-B magnets and magnetic cores, manufactured of amorphous alloy tape.

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17

McArdle, M. G., and D. J. Morrow. "Noninvasive Detection of Brushless Exciter Rotating Diode Failure." IEEE Transactions on Energy Conversion 19, no. 2 (June 2004): 378–83. http://dx.doi.org/10.1109/tec.2003.822325.

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18

Zubkov, Yuri V., Sergey Y. Kaurov, and Vladislav E. Vereshagin. "Experimental study of brushless generator with integrated exciter." Vestnik of Samara State Technical University. Technical Sciences Series 28, no. 3 (December 11, 2020): 125–38. http://dx.doi.org/10.14498/tech.2020.3.8.

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The paper studies an integrated starter-generator based on a synchronous machine with PM excitation (ISG), used to start an internal combustion engine (ICE) of an autonomous energy facility or vehicle and supply electric energy to its consumers. The purpose of the work is to obtain a mathematical model of the starting mode in the form of a system of differential equations, its virtualization by means of the Matlab Simulink package and a diesel engine starting simulation using ISG with the study of the starting process dynamic characteristics. It is also required to carry out experimental verification of theoretical results through field tests of a prototype starter-generator to confirm the mathematical model adequacy. Difficulties in the analysis and synthesis of ISG are due to the complexity of electromechanical energy conversion processes in it and the trapezoidal nature of the magnetic field spatial distribution in the gap, which was established when solving the magnetostatic problem by the finite element method. These features make it difficult to use traditional research methods. The mathematical model of the operation starting mode, obtained under a number of assumptions that do not affect the nature of electromechanical processes, makes it possible to investigate the ICG static and dynamic characteristics during the electric start of the internal combustion engine. The ISG start-up process simulation was carried out on the basis of equations describing the starter operation using control systems both without starting current limitation and with limitation and providing a sufficient starting torque. Modeling made it possible to determine the start duration and the change of the electromagnetic torque, inverter and winding currents. A prototype ISG was designed and manufactured. Full-scale tests of the diesel engine electric start system were carried out. The results obtained confirmed the adequacy of the developed mathematical model and the possibility of its use in the study of the ISG other specific operating modes.

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19

Metidji, R., B. Metidji, and B. Mendil. "New Neural Power System Stabilizer for Brushless Exciter." Arabian Journal for Science and Engineering 38, no. 11 (December 19, 2012): 3103–12. http://dx.doi.org/10.1007/s13369-012-0469-x.

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20

Grabovskii, Vladimir. "Estimation of Damage Rotor Shaft of Turbogenerators with a Diode Brushless Excitation System." Известия высших учебных заведений. Электромеханика 64, no. 4-5 (2021): 90–98. http://dx.doi.org/10.17213/0136-3360-2021-4-5-90-98.

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The damage to the rotor shafts of high-power turbo generators is estimated as a result of the resonant in-teraction between the generator and the exciter caused by the operation of the automatic excitation regulator (AER) by mathematical modeling. The analysis covers turbo generators with a capacity of 300 to 1000 MW with a diode brushless excitation system (DBES). The simulated circuit includes a turbo generator with a block transformer, a power transmission line, an exciter in the form of a reversed synchronous generator with a rotat-ing rectifier diode converter unit, a static thyristor converter, and a sub-exciter in the form of a synchronous machine with permanent magnets. When modeling the electrical part, an approach is used from the positions of its own coordinates, which ensures maximum methodological consistency of the models of the listed devices and allows directly reproducing resonant phenomena at torsional vibration frequencies with the determination of instantaneous values of currents, voltages and electromagnetic moments of the turbo generator and exciter. The mechanical system is presented taking into account the exciter and sub-exciter as a seven-mass system. AER is introduced into the mathematical model by means of transfer functions with corresponding coefficients and time constants. The control system of the thyristor converter is represented in the model by a generator of line-arly increasing signals, a body for comparing these signals with the signal from the AER and a control pulse generator. To assess the damage rate, the deformation criterion for soft and hard loads in the zone of low-cycle fatigue and the force criterion in the zone of multi-cycle fatigue were used. A comparative quantitative assess-ment of the damage in the neck of the G-E shaft line in the resonant interaction between the exciter and the generator with different automatic excitation control systems is given. The influence of attenuation of electro-magnetic transients and damping of torsional vibrations on the damage values is analyzed. The results ob-tained can be used to analyze the functioning and determine the settings of the AER.

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21

Nonaka, Sakutaro, Katsumi Kesamaru, and Kazuo Horita. "Analysis of Brushless Three-Phase Synchronous Generator Without Exciter." IEEJ Transactions on Industry Applications 112, no. 5 (1992): 483–89. http://dx.doi.org/10.1541/ieejias.112.483.

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22

Nonaka, S., and K. Kesamaru. "Analysis of voltage-adjustable brushless synchronous generator without exciter." IEEE Transactions on Industry Applications 25, no. 1 (January 1989): 126–32. http://dx.doi.org/10.1109/28.18882.

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23

Nonaka, Sakutaro, Katsumi Kesamaru, and Kazuo Horita. "Analysis of brushless three-phase synchronous generator without exciter." Electrical Engineering in Japan 113, no. 7 (1993): 135–44. http://dx.doi.org/10.1002/eej.4391130713.

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24

Mahtani, Kumar, José M. Guerrero, Luis F. Beites, and Carlos A. Platero. "Application of a Model-Based Method to the Online Detection of Rotating Rectifier Faults in Brushless Synchronous Machines." Machines 11, no. 2 (February 3, 2023): 223. http://dx.doi.org/10.3390/machines11020223.

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Converters are one of the most sensible components of any power conversion system when it comes to electrical faults. Moreover, if these converters are used in a rotating system, as is the case with rotating rectifiers used in brushless synchronous machines, apart from also being exposed to mechanical effects and thus having a greater likelihood of failure, no access is available directly, causing a lack of available measurements for condition monitoring. This paper applies a model-based method to the online detection of open-diode faults, shorted-diode faults and exciter open-phase faults in the rotating rectifiers of brushless synchronous machines. The applied method relies on the comparison between the measured and the theoretical exciter field currents, the latter computed through a healthy machine model from the machine actual output values. The proposed protection strategy stands out for its computational simplicity and its non-invasiveness, which makes its industrial application straightforward without the need of any further equipment or adaptation. Its applicability has been verified through a double approach, on the one hand, through computer simulations, and, on the other hand, through experimental tests, achieving satisfactory results. The research conducted proves that with the proposed method, given reasonable measurement and model estimation typical errors of less than 5%, positive differences between the measured and the theoretical exciter field currents of more than 13%, 200% and 30% for open-diode faults, shorted-diode faults and exciter open-phase faults, respectively, are detectable with at least a 95% confidence interval.

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25

Wu, Shitao, Qingguang Chen, Qing Li, Xiangsheng Liu, Hailin Zhang, and Li Lin. "Design of Aviation High Impedance Permanent Magnet Synchronous Generator." Mathematical Problems in Engineering 2021 (April 24, 2021): 1–10. http://dx.doi.org/10.1155/2021/6667877.

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Permanent magnet generator is one of the key components of a three-stage electrically excited brushless synchronous motor, with a main function to provide excitation power for the main exciter and driving power for the controller. In order to improve the reliability and safety of the operation of the three-stage electrically excited brushless synchronous motor, the permanent magnet generator is required to provide sufficient power under all operating conditions and to have low short-circuit current when its own short-circuit fault occurs, so that the generator will not be burnt out due to overheating. Thus, power characteristic and high impedance characteristic are the key goals of designing a permanent magnet generator. In this paper, the fractional slot concentrated winding was adopted to calculate and analyze the electromagnetic properties of permanent magnet generators with different rotor structures, and the optimal design was obtained. A prototype was manufactured to conduct related experiments on the electromagnetic properties. The results demonstrated that the experimental data are basically consistent with the simulation data, and the permanent magnet generator can meet the design requirements for power and high impedance characteristics, with a high power density.

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26

Chubraeva, L. I., and S. S. Timofeyev. "Conversion of DC Armature Winding into Multi-Phase AC Winding." Journal of Physics: Conference Series 2096, no. 1 (November 1, 2021): 012147. http://dx.doi.org/10.1088/1742-6596/2096/1/012147.

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Abstract The paper is dedicated to the principles of transformation of a rotating armature of DC machine into a rotating AC armature of a reverse-type AC alternator, which represents finally the major part of a model brushless exciter. The methodology of this conversion is based on main principles of the theory of electrical machines [1, 2].

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Zouaghi, T., and M. Poloujadoff. "Modeling of polyphase brushless exciter behavior for failing diode operation." IEEE Transactions on Energy Conversion 13, no. 3 (1998): 214–20. http://dx.doi.org/10.1109/60.707598.

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28

Ibrahim, Maged, and Pragasen Pillay. "Hysteresis-Dependent Model for the Brushless Exciter of Synchronous Generators." IEEE Transactions on Energy Conversion 30, no. 4 (December 2015): 1321–28. http://dx.doi.org/10.1109/tec.2015.2432763.

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29

Fedotov, A., A. Leonov, G. Vagapov, and A. Mutule. "Influence of Voltage Dips on the Operation of Brushless Exciter System of Synchronous Machines." Latvian Journal of Physics and Technical Sciences 53, no. 3 (June 1, 2016): 45–56. http://dx.doi.org/10.1515/lpts-2016-0020.

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Abstract This paper presents a mathematical model with continuous variables for brushless exciter system of synchronous machines, containing the thyristor elements. Discrete Laplace transform is used for transition from a mathematical model of a system with variable structure in continuous variables to equation finite difference with permanent structure. Then inverse transition is made to a mathematical model in continuous variables with permanent structure.

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30

Tang, Junfei, Yujing Liu, and Nimananda Sharma. "Modeling and Experimental Verification of High-Frequency Inductive Brushless Exciter for Electrically Excited Synchronous Machines." IEEE Transactions on Industry Applications 55, no. 5 (September 2019): 4613–23. http://dx.doi.org/10.1109/tia.2019.2921259.

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31

Yi, Xin Qiang, Dong Wang, and Zhen Zhong Su. "Stability Boundary of Current Closed-Loop Control of Two-Quadrant H-Half Bridge Converter in SGBES." Advanced Materials Research 846-847 (November 2013): 612–15. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.612.

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This paper presents a two-quadrant H-half bridge converter used as the field current amplifier of ac exciter in the synchronous generator brushless excitation system (SGBES). Differing from the conventional amplifier, the exciter field winding can be supplied with positive and negative voltage to help increase the response speed of the excitation system. However, there will be some problems of stability when the converter is used in the current closed-loop control system. To prevent the converter from working in the unstable area, the stability of the linear area has been analyzed. Finally, it is verified by the experimental results. These can provide a valuable theoretical and practical basis for the design of parameters for the current closed-loop control system used by the converter.

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32

Darabi, A., and C. Tindall. "Brushless exciter modeling for small salient pole alternators using finite elements." IEEE Transactions on Energy Conversion 17, no. 3 (September 2002): 306–12. http://dx.doi.org/10.1109/tec.2002.801734.

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Aliprantis, D. C., S. D. Sudhoff, and B. T. Kuhn. "Genetic Algorithm-Based Parameter Identification of a Hysteretic Brushless Exciter Model." IEEE Transactions on Energy Conversion 21, no. 1 (March 2006): 148–54. http://dx.doi.org/10.1109/tec.2005.847967.

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Darabi, A., and C. Tindall. "Brushless Exciter Modeling for Small Salient Pole Alternators Using Finite Elements." IEEE Power Engineering Review 22, no. 6 (June 2002): 56. http://dx.doi.org/10.1109/mper.2002.4312281.

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Oh, Yongseung, Wonseok Oh, and Kyumin Cho. "Emergency Brushless Synchronous Generator Having Rotating Exciter Status Monitoring and Protection Functions." JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CONVERGENCE 10, no. 2 (December 31, 2020): 1–13. http://dx.doi.org/10.14801/jaitc.2020.10.2.1.

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Kutt, Filip, Michał Michna, and Grzegorz Kostro. "Non-Salient Brushless Synchronous Generator Main Exciter Design for More Electric Aircraft." Energies 13, no. 11 (May 27, 2020): 2696. http://dx.doi.org/10.3390/en13112696.

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This paper presents a prototype of high speed brushless synchronous generators (BSG) design for the application in autonomous electric power generation systems (e.g., airplane power grid). Commonly used salient pole field of the main generator part of BSG was replaced with a prototype non-salient pole field. The main objective of the research is an investigation into the advantages and disadvantages of a cylindrical field of the main generator part of BSG over the original salient pole field. The design process of the prototype generator is presented with a focus on the electromagnetic and mechanical finite element method (FEM) analysis. The measurements of prototype and commercial BSG were conducted for the nominal speed of 8 krpm. The advantages and disadvantages of the proposed solution were established based on measurements in load and no-load conditions.

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Nonaka, Sakutaro, and Masao Oomoto. "A Brushless Cylindrical-Rotor 4-Pole Three-Phase Synchronous Generator Without Exciter." IEEJ Transactions on Industry Applications 119, no. 5 (1999): 720–27. http://dx.doi.org/10.1541/ieejias.119.720.

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Darabi, A., C. Tindall, and S. Ferguson. "Finite-Element Time-Step Coupled Generator, Load, AVR, and Brushless Exciter Modeling." IEEE Transactions on Energy Conversion 19, no. 2 (June 2004): 258–64. http://dx.doi.org/10.1109/tec.2004.827293.

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Aliprantis, D. C., S. D. Sudhoff, and B. T. Kuhn. "A Brushless Exciter Model Incorporating Multiple Rectifier Modes and Preisach's Hysteresis Theory." IEEE Transactions on Energy Conversion 21, no. 1 (March 2006): 136–47. http://dx.doi.org/10.1109/tec.2005.847968.

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Abdel-Halim, M. A., and C. D. Manning. "Modelling a laminated brushless exciter-alternator unit in all modes of operation." IEE Proceedings B Electric Power Applications 138, no. 2 (1991): 87. http://dx.doi.org/10.1049/ip-b.1991.0011.

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Oh, Yongseung, Wonseok Oh, and Kyumin Cho. "Emergency Brushless Synchronous Generator Having Rotating Exciter Status Monitoring and Protection Functions." JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CONVERGENCE 10, no. 2 (December 31, 2020): 1–13. http://dx.doi.org/10.14801/jaitc.2020.10.2.1.

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42

Griffo, Antonio, Rafal Wrobel, Phil H. Mellor, and Jason M. Yon. "Design and Characterization of a Three-Phase Brushless Exciter for Aircraft Starter/Generator." IEEE Transactions on Industry Applications 49, no. 5 (September 2013): 2106–15. http://dx.doi.org/10.1109/tia.2013.2269036.

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Bumby, Chris W., Rodney A. Badcock, Hae-Jin Sung, Kwang-Min Kim, Zhenan Jiang, Andres E. Pantoja, Patrick Bernardo, Minwon Park, and Robert G. Buckley. "Development of a brushless HTS exciter for a 10 kW HTS synchronous generator." Superconductor Science and Technology 29, no. 2 (January 12, 2016): 024008. http://dx.doi.org/10.1088/0953-2048/29/2/024008.

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44

Abdel-halim, M. A. "Direct-phase modelling of isolated brushless exciter-alternator unit including the magnetic nonlinearities." IEE Proceedings - Electric Power Applications 142, no. 3 (1995): 206. http://dx.doi.org/10.1049/ip-epa:19951869.

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45

Kim, Yong-Han, Bo-Suk Yang, and Chang-Joon Kim. "Noise Source Identification of Small Fan-BLDC Motor System for Refrigerators." International Journal of Rotating Machinery 2006 (2006): 1–7. http://dx.doi.org/10.1155/ijrm/2006/63214.

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Noise levels in household appliances are increasingly attracting attention from manufacturers and customers. Legislation is becoming more severe on acceptable noise levels and low noise is a major marketing point for many products. The latest trend in the refrigerator manufacturing industry is to use brushless DC (BLDC) motors instead of induction motors in order to reduce energy consumption and noise radiation. However, cogging torque from BLDC motor is an undesirable effect that prevents the smooth rotation of the rotor and results in noise. This paper presents a practical approach for identifying the source of excessive noise in the small fan-motor system for household refrigerators. The source is presumed to a mechanical resonance excited by torque ripple of the BLDC motor. By using finite element analysis, natural frequencies and mode shapes of the rotating part of the system are obtained and they are compared with experimental mode shapes obtained by electronic torsional excitation test which uses BLDC motor itself as an exciter. Two experimental validations are carried out to confirm the reduction of excessive noise.

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46

Gorginpour, Hamed. "Optimal design of brushless AC exciter for large synchronous generators considering grid codes requirements." IET Generation, Transmission & Distribution 12, no. 17 (September 30, 2018): 3954–62. http://dx.doi.org/10.1049/iet-gtd.2018.5446.

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47

Ataev, T. S., and V. I. Denisenko. "Small Enclosed Diesel Generator with a Multifunctional Brushless Exciter and Nanostructured Insulating Materials Used." Procedia Engineering 150 (2016): 185–89. http://dx.doi.org/10.1016/j.proeng.2016.06.745.

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48

Mi, C., M. Filippa, J. Shen, and N. Natarajan. "Modeling and Control of a Variable-Speed Constant-Frequency Synchronous Generator With Brushless Exciter." IEEE Transactions on Industry Applications 40, no. 2 (March 2004): 565–73. http://dx.doi.org/10.1109/tia.2004.824504.

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Noland, Jonas Kristiansen, Fredrik Evestedt, J. Jose Perez-Loya, Johan Abrahamsson, and Urban Lundin. "Design and Characterization of a Rotating Brushless Outer Pole PM Exciter for a Synchronous Generator." IEEE Transactions on Industry Applications 53, no. 3 (May 2017): 2016–27. http://dx.doi.org/10.1109/tia.2017.2669890.

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Rosado, S., Xiangfei Ma, G. Francis, Fei Wang, and D. Boroyevich. "Model-Based Digital Generator Control Unit for a Variable Frequency Synchronous Generator With Brushless Exciter." IEEE Transactions on Energy Conversion 23, no. 1 (March 2008): 42–52. http://dx.doi.org/10.1109/tec.2006.888040.

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Journal articles on the topic 'Brushless exciter'

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