Volume 61 Issue 2 (2011) - Годишник на ТУ - София - Технически ...

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Fig.8. Actuator coil current.Fig.9. Armature displacement.Fig.10. Electromagnetic force.Fig.11. Electromagnetic actuator inductance.120
A DC electromagnetic actuators with double E-shaped core is investigated with theproposed approach. The magnetic field model of the investigated electromagnetic actuatoris built. The heating model is created. The couple magnetic-heating problem isformulated. The finite element method is applied for modelling of electromagneticand heating processes and for determination of different characteristics as electromagneticforce, temperature distributions, coil inductance, magnetic flux density distributionsetc. Both field problems are coupled with Matlab/Simulink circuit modelinterfacing with Octave/Lua. Simulink-Octave interface is realized. Octave-Femm interfaceis made by Lua-scrip file.Method is suitable for accurate electrical drives investigations, optimization and designactivities.5. AcknowledgmentPart of this research is supported by the National Science Fund of the Ministry of Educationand Science of Bulgaria under Contract “D002-157/2008”.REFERENCES[1] Zhou P., Fu W., Lin D., Stanton S., Cendes Z., Longya Xu, (2002), NumericalModeling of Electrical Machines and Its Application, Industry ApplicationsConference, 37th IAS Annual Meeting, 2002, Vol.3, pp. 1936–1942.[2] Di Barba P., A. Savini and S. Wiak, Field models in electricity and magnetism,Springer, 2008.[3] Yatchev I., (2003), Coupled field problems in electrical apparatus, Facta Universitatis.Series: Mechanics, Automatic Control and Robotics, Vol.3, No15, 2003,pp. 1089–1101.[4] Terzova A., Katsarski K., Kashukeev K., Mateev V., Marinova I., (2010), Computermodelling and optimization of electromagnets in education on electricalapparatus. Proceedings of the 20th International PhD Seminar on ComputationalElectromagnetics and Optimization in Electrical Engineering - CEMOEE 2010,September 10-13, Sofia, Bulgaria, 2010, pp. 154-157.[5] Wiak S., A. Krawczyk and I. Doležel, Intelligent computer techniques in appliedelectromagnetics, Springer-Verlag, 2008.[6] Di Barba P., Multiobjective shape design in electricity and magnetism, Springer,2010.[7] Alexandrov A., Computer aided design of electrical apparatus, Avangard-Prima, 2004 (in Bulgarian).[8] Meeker D., Finite element method magnetics, Version 4.2, User’s manual, 2009.[9] Meeker D., Finite element method magnetics: Octave/Femm, Version 1.2, User’smanual, 2009.[10] Matlab Inc, The Language of Technical Computing, MATLAB GraphicsReference, 2006.121
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ISSN 1311-0829ГОДИШНИК НА
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Годишник на Технич
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• If a neutral element 1 of the s
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Proof. (i) Since for arbitrary ≀
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)is the endomorphism ≀ 0, . . . ,
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∣∣E (k)C n∣ ∣∣ =Propositi
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For k = 0 and s = 1 from the last p
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Facts concerning semilattices can b
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described by the following join-tab
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Finally we observe{aj , if i = k(f
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Let us consider the endomorphisms f
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Proposition 3.8 For any n ≥ 2 in
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Cryptographic protocols based on DL
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2.5 Bi-Semigroup Action Problem (BS
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Theorem 4.5 [14]. In the center of
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The only way we know for an attacke
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The exact definitions of points and
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FirstIterationSecondIterationx 0 0
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* x4. Order of approximationBecause
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генератори, присъе
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№ РежимТабл.4.1 Бала
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Табл.11 2 3 4 5 6 7Загуби
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оцени разхода на ак
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сформатора се нала
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-да допуска претова
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Page 75 and 76: KU BHOCHR (12)w w wЗа да се
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Page 79 and 80: aided impregnation of wood and wood
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Page 83 and 84: Table 2. Carbon peak C s1 component
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Page 111 and 112: Fig.8 Calculated initial cogging to
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Page 117 and 118: pends on the results of the thermal
Page 119: 4. ResultsAs it has been mentioned
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2. Примерни компютъ
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3.3. Изследване на фо
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алгебра. За целта с
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3.13. Изчисляване на
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Количеството на от
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(CaSO 4 .2H 2 O) (фиг. 3). То
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работят всички инс
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(НДНТ), което за Бъл
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Communications software and hardwar
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puter is running virtualization sof
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execution to the dispatcher applica
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Тунелирането скрив
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управление на ресу
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Фиг.6: Симулационен
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tunnel source 1.1.1.1tunnel destina
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При отворена вериг
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Таблица 3Задвижващ
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Фигура 3.При съотно
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Необходимо е така д
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yследователно:( k )UOsi
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Laskin and Wang presented a detaile
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Figure 2: Temperature dependence of
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An additional analysis obtained at
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Volume 61 Issue 2 (2011) - Годишник на ТУ - София - Технически ...

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