Two new types of HTS electric machine are considered. The first type
is hysteresis motors and generators with cylindrical and disc rotors
containing bulk HTS elements. The second type is reluctance motors with
compound HTS-ferromagnetic rotors. The compound HTS-ferromagnetic rotors,
consisting of joined alternating bulk HTS (YBCO) and ferromagnetic (iron)
plates, provide a new active material for electromechanical purposes. Such
rotors have anisotropic properties (ferromagnetic in one direction and
diamagnetic in the perpendicular one). Theoretical and experimental results
for HTS hysteresis and reluctance motors are presented. A series of hysteresis
HTS motors with output power rating from 1 kW (at 50 Hz) up to 4 kW (at
400 Hz) and a series of reluctance HTS motors with output power 2-18.5 kW (at
50 Hz) were constructed and successfully tested. It was shown that HTS
reluctance motors could reach two to five times better overall dimensions and
specific power than conventional asynchronous motors of the same size and will
have higher values of power factor (cos φ⩾0.7 to 0.8).
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