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. E. (2010). Linear permanent magnet generator for power supply systems of autonomous objects (in Russian). Mechanical Engineering, 1 , 80–82. 10. Budikova, N. L., Sattarov, R. R., & Polihach, E. A. (2009). To the question of classification of linear electric generators (in Russian). Gazette of Ufa State Aviation Technical University , 12 (2), 145–149. 11. Visocky, V. E., Tarashev, S. A., Sinicin, A. P., Zlobina, E. K., & Minenko, S. I. (2012). Development and design of linear permanent magnet generators for autonomous electric power systems (in Russian

, 2009, pp. 1–5. [3] T. Tiirats, O. Pabut, A. Kallaste, H. Herranen, H. Naar, T. Vaimann, “Analysis of Mechanical Vibrations Caused by Eccentricity in a Slow-Speed Slotless Permanent Magnet Generator,” Electric Power Quality and Supply Reliability Conference PQ 2014, IEEE, Rakvere, Estonia, June 11–13, 2014, pp. 1−5. [4] A. Zavvos, A. S. McDonald, M. Mueller, D. J. Bang, and H. Polinder, “Structural comparison of permanent magnet direct drive generator topologies for 5MW wind

References Baranski, M., Szelag, W. and Jedryczka, C. (2017). Influence of Temperature on Partial Demagnetization of the Permanent Magnets During Starting Process of Line Start Permanent Magnet Synchronous Motor. In: 2017 International Symposium on Electrical Machines (SME) , Naleczow, Poland, 18–21 June 2017, IEEE, pp. 1–6. Casadei, D., Filippetti, F., Mengoni, M., Gritli, Y., Serra, G., Tani, A. and Zarri, L. (2012). Detection of Magnet Demagnetization in Five-Phase Surface-Mounted Permanent Magnet Generators. In: 2012 3rd IEEE International Symposium on

., Reliability of Different Wind Turbine Concepts with Relevance to Offshore Application, European Wind Energy Conference, Scientific Track, Brussels, Belgium, European Wind Energy Association, April 2008. [17] KALLASTE A., VAIMANN T., BELAHCEN A., Possible manufacturing tolerance faults in design and construction of low speed slotless permanent magnet generator, 16th European Conference on Power Electronics and Applications (EPE’14-ECCE Europe), Lappeenranta, 2014, 1-10. [18] MULJADI E., GREEN J., Cogging Torque Reduction in a Permanent Magnet Wind Turbine Generator, 21st


The paper discusses problems concerning the influence of permanent magnet material characteristics on the low-speed permanent magnet generator losses and output characteristics. The variability of the magnet material and its effect on the output parameters of the machine has been quantified. The characteristics of six different grades of neodymium permanent magnets have been measured and compared to the supplier specification data. The simulations of the generator have been carried out using transient finite element analysis. The results show that magnet materials from different suppliers have different characteristics, which have a significant influence on the generator output parameters, such as efficiency and power factor.


The authors present a small-scale wind turbine emulator based on the AC drive system and discuss the methods for power coefficient calculation. In the work, the experimental set-up consisting of an AC induction motor, a frequency converter, a synchronous permanent magnet generator, a DC-DC boost converter and DC load was simulated and tested using real-life equipment. The experimentally obtained wind turbine power and torque diagrams using the emulator are in a good agreement with the theoretical ones.

References Kopilov, I., & Ljadova, T. (1988). Wind turbine without gearbox. Hydro project, Nr.129, 170-174 (in Russian). Levin, N., & Serebrjakov, A. (1991). Inductor generator in small power wind turbine. Energy buildings , (3), 53-55 (in Russian). Dirba, J., Levin, N., & Pugachov, V. (2006). Vēja Energijas elektromehāniskie pārveidotāji. Rīga: RTU, p. 312 (in Latvian). Spooner, E., & Williamson, A. (1996). Direct coupled permanent magnet generators for wind turbine applications. IEEE proceedings, Electric Power Appl., 143 (1). Postnikov, I. (1975

List of abbreviations VI List of abbreviations: AEPS Autonomous Electrical Power System GCB Generator Control Breaker BTB Bus Tie Breaker TRU Transformer Rectifier Unit ATRU Auto Transformer Rectifier Unit MEA More Electrical Aircraft MOET More Open Electrical Technology ECS Environmental Control System GUT Gdansk University of Technology BSG Brushless Synchronous Generator SM Synchronous Machine SM Synchronous Machine SG Synchronous Generator GCU Generator Control Unit GVR Generator Voltage Regulator PF Power Factor PMG Permanent Magnet

References 1. Hindmarsh, J., & Renfrew, A. (2002). Electric Machines and Drive Systems (3rd ed-n) . Oxford: Newness. 2. Spooner, E., & Williamson, A.C. (1996). Direct coupled permanent magnet generators for wind turbine applications. Proc. IEE-Elec. Power Appl., 143 (1), 1-8. 3. Levins, N., Kamolins, E., & Vitolina, S. (2011). Brushless Electric Machines. Riga: RTU (in Latvian). 4. Postnikov, I. M. (1975). A generalized theory and transient processes of electric machines. Moscow: Visshaya shkola (in Russian). 5. Dirba, J., Daškova-Golovkina, J., Ketners

R eferences [1] SULLA, F. Svensson,—J.—SAMUELSSON, O. : Symmetrical and Unsymmetrical Short-Circuit Current of Squirrel-Cage and Doubly-Fed Induction Generators, Electric Power Systems Research 81 No. 7 (2011), 1610–1618. [2] KLONTZ, K. W.—MILLER. T. J. E.—McGILP. M. I.—KARMAKER, H.—ZHONG, P. : Short-Circuit Analysis of Permanent-Magnet Generators, IEEE Transactions on Industry Applications 47 No. 4 (2011), 1670–1680. [3] ALBRIGHT, D. R. : Inter-turn Short-Circuit Detector for Turbine-Generator Rotor Windings, IEEE Transactions on Power Apparatus and Systems