Optimisation of Superconducting Motors with YBCO Bulk Material
In order to optimize superconducting motors with YBCO bulk material operating at 77 K, several motors have been constructed and tested up to more than 20 kW. These reluctance motors have been operated at different speeds in synchronous mode. The rotors consist of a combination of iron poles and HTS-segments. Special attention has been paid to internal loss mechanisms to improve the efficiency. With this respect the rotor geometry and the stator design have been varied. Different motor types “PILZ” and “ZEBRA” types have been constructed and tested. The test results are reported and compared. A computer program was installed and is the basis of theoretical considerations. The experimental results are in good accordance with the theory. The small size and low weight, as well as the high dynamics of these motors, can be considered as important advantages for various applications. The specific requirements of potential applications are discussed.
KeywordsPower Factor Maximum Torque Motor Type Load Characteristic Synchronous Mode
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