Recent Developments of Electrical Drives - Part 21 ppt

... Transformer of 3 kVA: Distribution of the magnetic field in the case of no-load. III-3.5. Improved Modeling of Three-Phase Transformer Analysis 459 Table 3. Comparison of results case of unsymmetrical ... i A in the case of no-load. Figure 7. Computed and measured primary current i B in the case of no-load. Figure 8. Computed and measured primary current i C in the case of no...

Ngày tải lên: 02/07/2014, 09:20

... the Library of Congress. ISBN -1 0 1- 4 02 0-4 53 4-4 (HB) ISBN -1 3 97 8 -1 -4 02 0-4 53 4-9 (HB) ISBN -1 0 1- 4 02 0-4 53 5-2 (e-book) ISBN -1 3 97 8 -1 -4 02 0-4 53 5-6 (e-book) Published by Springer, P.O. Box 17 , 3300 AA ... Brochet and A. Randria 10 1 11 . Electromagnetic Forces and Mechanical Oscillations of the Stator End Winding of Turbo Generators A. G...

Ngày tải lên: 02/07/2014, 09:20

... (eds.), Recent Developments of Electrical Drives, 1 2. C  20 06 Springer. 2 Introductory Remarks harmonics in PM motors. The technique that consists on the choice of an appropriate number of magnet ... insure ex- tended torque-speed envelope with maximum-torque-perstator-current operation range below the base speed as well as constant-power flux-weakening and maximum-torque-...

Ngày tải lên: 02/07/2014, 09:20

... Hitachi Ltd., 3- 1 -1 , Saiwaicho, Hitachi, Ibaraki 31 7-8 511, Japan kenichi hattori@pis.hitachi.co.jp, isao@keyaki.cc.u-tokai.ac.jp 3 Steel Research Laboratories, Nippon Steel Corp., 2 0-1 , Shintomi, ... Futtsu, Chiba 29 3- 8 511, Japan mogi@re.nsc.co.jp 4 Flat Products Division, Nippon Steel Corp., 6 -3 , Otemachi, 2-chome, Chiyoda-ku, Tokyo 10 0-8 071, Japan 5 Yawata Works,...

Ngày tải lên: 02/07/2014, 09:20

... Wiak, M. Dems, K. Kom ˛ eza (eds.), Recent Developments of Electrical Drives, 13–23. C  2006 Springer. I-2. Losses in Large Hydro-generators 15 By defining the N-dimensional vector o T = (1 1) we ... no-load losses of largesynchronous machines withsalient poles. Asshown in Fig. 4, aset of various machines is taken into account. Optimization of theno-load electromagnetic losses...

Ngày tải lên: 02/07/2014, 09:20

... Roebelstabwick- lung, Dissertation, TU-Wien, 2003. [14] M.T. Holmberg, “Three-dimensional Finite Element Computation of Eddy Currents in Syn- chronous Machines”, Technical Report No. 350 , Department of ... with the expected values of this reactance. We think this is because the d-axis flux consist of the combine action of magnets, d-axis current and q-axis current. The effect of I...

Ngày tải lên: 02/07/2014, 09:20

... Wave data has been collected S. Wiak, M. Dems, K. Kom ˛ eza (eds.), Recent Developments of Electrical Drives, 39–49. C  20 06 Springer. 42 Mueller et al. F gen F wave x(t) (i,x) desire d Î i(t) Generator ... emulator. 36 P´erez-Donsi´on Figure 17. Graphic representation of the magnets and reluctance torques vs. time during a sudden decrease of the load. we can defined it like...

Ngày tải lên: 02/07/2014, 09:20

... magnets. Figure 2. 12-pole PM motor design with magnets in V-shape. Figure 3. 12-pole PM motor design with magnets in U-shape in every second pole. I-4. Dynamic Modeling of VHM 45 150 100 50 -5 0 -1 00 -1 50 0 ... densities of V-shape and U-shapeA designs produced only by magnets in the stator teeth with different rotor angles. Figure 9. Total three-phase output power. 4000 3000...

Ngày tải lên: 02/07/2014, 09:20

... the middle of the involute part of the upper layer bar of the first coil of phase a of the two-pole generator, which has to sustain the largest electromagnetic forces during the three-phase terminal ... Institute of Electrical Machines and Drives: University of Hannover, 1996. [4] B. Frei-Spreiter,Ein BeitragzurBerechnung derKr¨afteimWickelkopfbereichgroßerSynchron- maschine...

Ngày tải lên: 02/07/2014, 09:20

... effect ofmagnetostriction and stress-dependentmagnetostriction on the vibrations of an induction motor. S. Wiak, M. Dems, K. Kom ˛ eza (eds.), Recent Developments of Electrical Drives, 201 210 . C  2006 ... 0.760 II-6. EFFECT OF STRESS-DEPENDENT MAGNETOSTRICTION ON VIBRATIONS OF AN INDUCTION MOTOR A. Belahcen Laboratory of Electromechanics, Helsinki University of Technolog...

Ngày tải lên: 02/07/2014, 09:20

... Kom ˛ eza (eds.), Recent Developments of Electrical Drives, 225–236. C  2006 Springer. II-7. Comparison of Stator- and Rotor-Force Excitation 223 The results show that the direction of the rotation ... sound. Conclusion In this paper the structure- and air-borne noise of an induction machine with squir rel-cage rotor are estimated. Forthis, different types of surface-forceex...

Ngày tải lên: 02/07/2014, 09:20

... better control of the power flow the fluctuation of the dc-link voltages will be decrease. So the size of the dc-link capacitor can be reduced. II-10. Impact of Magnetic Saturation of Induction Motor ... saturation modelling in d-q axis models of induction machines, IEEE Trans. Energy Convers., Vol. 10, No. 3, pp. 455–461, 1995. [4] E. Levi, Impact of cross-saturation on accuracy...

Ngày tải lên: 02/07/2014, 09:20

... disposition); S. Wiak, M. Dems, K. Kom ˛ eza (eds.), Recent Developments of Electrical Drives, 307–320. C  2006 Springer. III-1.1. Design and Manufacturing of Steel-Cored PMLSM 301 Figure 6. Optimal design ... validity of sets of the design variables under III-1.1. Design and Manufacturing of Steel-Cored PMLSM 305 Figure 11. Running characteristics of designed motor. Figur...

Ngày tải lên: 02/07/2014, 09:20

... winding; r the no. of teeth/cycle N tc and the no. of coils/cycle N cc must be multiple of the no. of phases N ph ; r links about no. of teeth/cycle-phase N tcph and no. of coils/cycle-phase N ccph :N tc = N ph N tcph ;N cc = ... e.m.f. It is particularly noticeable the absolute absence of slotting effects, in spite of the very low no. of slots/(pole-phase). The phase-to-neu...

Ngày tải lên: 02/07/2014, 09:20

... “Comparison Between a Novel Claw-Pole Electrically Mag- netized Synchronous Machine Without Slip-Rings and a Permanent Magnet Machine”, IEEE International ElectricalMachines and DrivesConference, Madison, ... outer cylindrical surface of the yoke. The whole surface area of the end-plates was used to cool the copper losses of the d.c. winding (“Pcu2”) and the iron losses of the end-pla...

Ngày tải lên: 02/07/2014, 09:20