Recent Developments of Electrical Drives - Part 16 potx

... 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...

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... 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...

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... (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-...

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... 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,...

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... 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...

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... 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...

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... 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...

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... 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...

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... Kolehmainen Table 2. Comparison of nominal load results Measured Calculated Calculated Calculated V-shape V-shape U-shapeA U-shapeB T n [Nm] 87 5 87 5 87 5 87 5 I n [A] 46.5 45.5 45 .8 45.4 Cos ω 0.993 0.997 ... 45.4 Cos ω 0.993 0.997 0.997 1.000 η 0.929 0.946 0.939 0.9 38 Angle 32.6 29.7 25.4 T k [Nm] 1, 688 1,557 1,4 18 I k [A] 122.5 113 .8 98. 5 Cos ω 0 .85 6 0 .84 1 0 .80 4 Angl...

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... University of Lodz, Poland, ul. Stefanowskiego 18/22, 9 0 -9 24 Lodz, Poland prembowski@poczta.onet.pl, apelikan@mail.p.lodz.pl Abstract. The numerical model for three-dimensional field analysis of electrostatic ... with big asymmetries of the air gap in the electrostatic microactuators, especially with ferroelectrics. S. Wiak, M. Dems, K. Kom ˛ eza (eds.), Recent Developments of...

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... node i. j+n+1 i+k+2 j+n j i i+k j+n-i i+k-1 j+n-2 j-1 j-2 i-1 i-2 i+2 i+1 Figure 4. Part of the one level(z =const.) of the mesh with the overlappingregion(parts of electrodes dashed, dimensions ... enlarge)—symmetrical air gap. I-7. Analysis of Electrostatic Microactuators 77 j+n+1 i+k+2 j+n j i i+k j+n-i i+k-1 j+n-2 j-1 j-2 i-1 i-2 i+2 i+1 Figure 5. Part of the one level(z =co...

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... (eds.), Recent Developments of Electrical Drives, 141–153. C  2006 Springer. II-1. High-Frequency Position Estimators 143 Figure 1. Magnetizing characteristicwith i mo and φ mo the average modulusof ... and Ren´e K. Boel Electrical Energy Laboratory (EELAB), Department of Electrical Energy, Systems and Automation (EESA), Ghent University (UGent), Sint-Pietersnieuwstraat 41, B-...

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... made over iron mostly. S. Wiak, M. Dems, K. Kom ˛ eza (eds.), Recent Developments of Electrical Drives, 321 334 . C  2006 Springer. III-1.3. Axial Flux Surface Mounted PM Machine 323 way, radial ... range of airgap flux control to reduce or increase its value, this is made with low requirement of d-axis current. r This particular configuration allows us to control the level of e...

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... the stator cooling area is the same such as the warming of coils. The power-to-weight ratio of trapezoidal waveform machines is 28% higher than sinu- soidal machine but the magnets weight is 50% higher ... level of torque ripple is obtained for a magnet width equal to 90% of the pole pitch (Fig. 19). The trapezoidal waveform machine has 150% of the magnets volume but only 48% of t...

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... samples. 0,0E+00 2,0E-05 4,0E-05 6,0E-05 8,0E-05 1,0E-04 1,2E-04 1,4E-04 1,6E-04 1,8E-04 2,0E-04 1A 1B 2 3 4 5 AC-loss slope Meas slope 1.0*Cond FEM slope 1.0*Cond FEM slope 1.2*Cond Figure 11. AC-slopes—ring ... modifications. S. Wiak, M. Dems, K. Kom ˛ eza (eds.), Recent Developments of Electrical Drives, 423 433 . C  2006 Springer. III-3.2. Loss Calculations for Soft Magnetic Com...

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