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Demonstration of two synchronous motors using high temperature superconducting field coils

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4 Author(s)
Joshi, C.H. ; American Supercond. Corp., Westborough, MA, USA ; Prum, C.B. ; Schiferl, R.F. ; Driscoll, D.I.

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.<>

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )