10.6 Studies on HTS linear synchronous motor Ë 381Fig. 10.6:(a) Inner (a 1 andc 1 ) and outer (a 2 andc 2 ) radii of the four racetrack coils, all units in
mm, figure not drawn to scale. (b) Picture of one coil with two segments of YBCO CC soldered
perpendicularly out of the plane of the coil for connection purposes [26].
Tab. 10.3:Coil parameters of coils No. 1 to No. 4 [27].
No. 1 No. 2 No. 3 No. 4Length of voltage contacts (mm) 3386 3476 3447
Ic(A) (77K, self field) 69. 05 74. 72 74. 95
n-value 30. 80 32. 70 29. 48
Field constant (Gauss / Ampère) 2. 17 2.09 2. 20 2. 22
Induction (mH) 0. 021 0. 021 0. 022
paper were performed at a frequency of 10.5 Hz for the stator and temperature of 77 K
for the excitation system.
10.6.2Bulk HTSC type excitation system
Bulk high-temperature superconductors (HTSC) can be magnetized as bulk
high-temperature superconductor magnets (HTSM). The HTSM can be applied as
predominantly “quasi-permanent magnet” in rotary or linear synchronous motor
Fig. 10.7:Four superconducting coils fixed under a fiberglass epoxy resin plate connected in series
with pole pitch of 126 mm [27].