The design, construction and testing of two synchronous motors, having output powers of 1.5 kW and 3.7 kW respectively, is described. Both motors have a salient pole field structure excited by high-temperature superconductor (HTS) coils. The first motor (1.5 kW) is a vertical axis, two-pole machine operating at 3600 rpm with a stationary field structure and a rotating armature whereas the second motor (3.7 kW) has a more conventional rotating field structure with four salient poles operating at 1800 rpm. The racetrack-shaped coils are made with flexible multifilamentary BSCCO conductor and operate at liquid nitrogen temperature and remained superconducting under all operating conditions. Each HTS coil contains approximately 170 m of conductor. The coils used in these motors have experienced over 40 thermal cycles with no degradation in performance. These demonstration motors represent a significant advancement in the application of HTS to electrical rotating machinery.
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