Dept. of Electrical Energy Conversion(E2C)

Transcription

1 Dept. f Electrical Energy Cnversin(E2C) 3 full prfessrs 3 assciate prfessrs 2 adjunct prfessrs 1 lecturer 2 senir researchers 3 administratin staff 15 PhD students 1

2 Lic. ch Dr. examinatins at E2C /91 93/94 96/ Lic Dr 2

3 Labratry fr electrical mtrs and pwer electrnics 7 student benches equipped with DSP-cntrlled mtrs. 10 test benches fr PhD students and senir researchers. Real-time simulatr, climate chamber, test cell fr high-speed mtr measurements, mtr test rigs, mechanical wrkshp. DC pwer supplies up t 700V, 375A r 75kW. AC pwer supplies up t 760V, 470 A, 360kVA r 500Hz. Trque balances up t 800Nm r 3750rpm. Measurement equipment, e.g. Ykgawa pwer meters and On Skki trque meters. 3

4 E2C Undergraduate Educatin Master's degree prject Pwer Electrnics Electrical Machines and Drives FACTS & HVDC in Electric Pwer Systems Mdulatin f Pwer Electrnic Cnverters Analysis f Electrical Machines Design f PM Synchrnus Machines Seminars in Electrical Machines and Pwer Electrnics Electrical tractin Hybrid Vehicle Drives Level D Pwer Electrnics Electrical Machines and Drives Civ. Ing. KTH years 4-5 Internatinal Master Exchange Electric Pwer Systems Level C Civ. Ing. KTH year 3 4

5 Dept. E2C.. Sme selected prjects Line start PM mtrs Integral Mtr High speed mtr with airgap winding The 4-quadrant transducer (4QT) Free Pistn Energy Cnverter (FPEC) Synchrnus Reluctance Machines (SynRM) High efficiency SiC 40kVA inverter 5

6 Line-start Permanent magnet mtrs squirrel cage hybrid mtr: asynchrnus start but PM synchrnus at steady-state permanent High efficiency High pwer factr ~1 Cnstant speed magnets (PM) Reduced starting trque lad, PM braking, IM quasi-static trques speed 6

7 Integral mtr Features PM design (size reductin) Statr integrated filter cils Small DC-link capacitr Sensrless speed cntrl Advantages Higher efficiency than equivalent IM (fr same frame size) 7

8 PMD High speed slt less mtr 75 kw high-speed PM mtr fr screw cmpressrs Air gap winding 4-ple PM rtr Features Slt less design Advantages High efficiency Lw vibratins N statr teeth t reduce irn lss at rpm 8

9 The Fur Quadrant Transducer (4QT) Features Electric gearbx with v.g.r. Slip ring mtr with an extra PM rtr in the airgap Advantages Stp and g functin Zer emissin peratin Substantial fuel reductin Cmpact design Fast transients eliminated 9

10 4QT -Radial-radial design Inner rtr Outer rtr Statr and husing 10

11 4QT Axial-radial design 1. Duble rtr machine Axial-radial 3D-flux PM machine Tridal winding Sft Magnetic Cmpsites segmented cre 2. Statr machine Radial flux PM machine Tth winding Istrpic laminated teeth 11

12 Free-Pistn Energy Transducer (FPEC) Design f linear electrical machine with fllwing requirements: Lw mvable mass (<6 kg) High pwer density (>1 kw/kg) High efficiency (>90 %) 12

13 Wrking principles fr a Transverse Flux Machine (TFM) B B Principles fr a cnventinal machine. Principles fr a TFM machine. 13

14 Cnventinal machine design 14

15 Descriptin f the nvel TFM with glbal winding arrangement Radial crss sectin f the nvel TFM perpendicular in respect t translatr mtin. Translatr wiev seen frm the statr. 15

16 A view f the nvel TFM in the directin f mtin 16

17 Tw different magnet arrays Alt. 1 Translatr back irn. Alt. 2 Halbach magnet cnfiguratin. 17

18 SynRM : New Cst Effective GP Machine in VSD Applicatin 3 SynRM Capabilities vs. IM High Efficiency >~ Eff1 High Trque density High Overlad Capacity Lw shaft Temperature Easy Prductin; n Cage Adaptability: Same Prductin Line Same enclsure ~ Same Inverter Lw maintenance High Reliability ~ Same Field-Weakening Easy Sensr-less Cntrl Braking at Standstill PMaSynRM vs. SynRM: (SynRM + Ferrite 4 PM) High Trque High PF High Efficiency High CPSR Design and FEM Evaluatin Fast FEM Optimizatin Trque Maximizatin Ripple Minimizatin Parameters Calc. (FEM) Perfrmance Evaluatin Skew & Ripple Analysis Starting Trque? : Synchrnus Reluctance Machine; 2: General Purpse; 3: Variable Speed Drives; 4: Permanent Magnet Assist SynRM; 5: Cnstant Pwer Speed Range. 18

19 High-efficiency 40kVA Silicn Carbide Inverter TARGET Demnstrate the ptential f Silicn Carbide pwer devices resulting in: Very high-efficiency and lw verall lsses Div. f Electrical Energy Cnversin Prf. Hans-Peter Nee 19

20 Experimental verificatin DSP cntrller Three-phase 40 kva inverter Supply vltage 700 V DC Output 3x400 V (industry standard) Switching frequency 10 khz Shrt-term verlad capability Efficiency at rated pint ~99.7% Free cnvectin is enugh (n fan!) Driver supplies 20

21 Applicatins : Industrial drives Hybrid Vehicles Tractin Renewable Energy Uncnventinal drives 21