9.4 HTS FESS principle model Ë 347Tab
. 9.4:
Parameters of HTSBs of Boeing, ATZ, ISTEC, KAIST and Nexans.
BoeingATZISTECKAISTNexansHTSBTypeASBRSB (inner PM rotor)RSB (outer PM rotor)ASBRSB (inner PM rotor)HTS statorRegular hexagonsingle-grain YBCO bulks,36 mm×36 mm×4.5 mm55 pieces of three- seedsrectangular YBCO bulks,65 mm×35 mm×13 mm, OD230 mm, ID205 mm×120 mm [60]40 pieces of roof tile shapedYBCO bulks with epoxy resinprotection, OD 123.2 mm,ID 93.2 mm, length60 mm×5 stories [24]7 pieces of disc typeYBCO bulks,휙10 mm×1.8 mm[64]270 pieces of squaresingle-grain YBCO bulks,35 mm×35 mm×10 mm,ID 325 mm×305 mm[19]PM rotor∼휙220 mm, PM ring
(radial polarity)+ironring, 4 magnetic poles[17]휙200 mm×∼120 mm, PMring (axial polarity, OD200 mm×ID 150 mm×8 mm)+iron ring [18], about 8
magnetic poles [30]OD∼휙170 mm×∼300 mm[71], PM ring (axial polarity)+iron ring, 16 magnetic
poles [24]∼휙25 mm, Single PM
ring (axial polarity)[64]OD 319 mm, PM ring(axial polarity)+ironring, 20 magnetic poles[19]Working gap Several mm [17]2 mm [60]1.8 mm [71]1 ∼7 mm [64]1 mm [19]CoolingsystemStirling-cycle cryocooler(15 W @ 77 K), G-10supportor [17]Liquid nitrogen, 72∼79 K,G-10 cryostat [18] (Now by35 W/80 K G/M cryocooler[30])Liquid nitrogen [24]Stirling cryocooler[64]“Coolpower 140T”(Leybold VakuumGmbH), stainless steelDewar [19]Experimentalspeed14510 rpm [28]3200 rpm [60]11250 rpm [27]51000 rpm [64]4400 rpm [19]MainperformanceWorking gap is 3.2 mm,axial stiffness of144 N/mm, radialstiffness of 69 N/mm [72]At 72 K, radial force andstiffness of 4.7 kN (3.2 mm)and 1.8 kN/mm, axial forceand stiffness of 10.08 kN(3.3 mm) and 4.5 kN/mm [18]Maximum axial force of8.7 kN [23]Mass of the flywheelis 63.2 g [64]Radial carrying capacityof 6900 N, radialstiffness of5.1 kN/mm@ 28 K [19]Loss∼−4 rpm/min (working
gap=3.9 mm, 5000 rpm,
50 K) [28]COF of 2.8×^10−^6,−^5×10−^4Nm [18]Simulated energy loss of0.55 mW/N at 6000 rpm for100 kWh HTSB model [27]COF of 0.001∼0.002(working gap of7 mm) [64]Application 5 kWh/ 3 kW-208 V ACFESS [17], design speedof 20000 rpm (10 kWh)[16]5 kWh/250 kW FESS with600 kg rotor [30], designspeed of 10000 rpm (10 kWh)[60]10 kWh/15 kW FESS with425 kg rotor, design speedof 15860 rpm (10 kWh) [23]337 J FESS for energystorage [64] andattitude control ofnano-satellites [66]4 MW HTS generator,supporting the 1000 kgshaft [19]