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Fundamental design and electrical characteristics of superconducting commutatorless motor
Author(s) -
Muta Itsuya,
Hoshino Tsutomu,
Hayashi Kenichiroh
Publication year - 1995
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391150112
Subject(s) - armature (electrical engineering) , reactance , stator , inverter , electromagnetic coil , synchronous motor , control theory (sociology) , torque , electrical engineering , sizing , induction motor , short circuit ratio , engineering , voltage , computer science , power factor , physics , control (management) , art , artificial intelligence , constant power circuit , visual arts , thermodynamics
Since there are no iron cores in the rotor and stator windings of superconducting synchronous motors, some reactances are intrinsically smaller than those of conventional motors. Thus the low synchronous reactance would be expected to improve the torque‐ampere ratio stability and the overload capacity in case of the variable‐speed drive system of a load‐commutated inverter due to the small armature reaction. Moreover, the low subtransient reactance may contribute to lessen the voltage stress during the shortened commutating period, especially in current source‐type inverter (CSI) systems. In this paper, after presenting analytical formulas needed for a machine design, one design algorithm is described, citing one example of an experimental CSI‐fed superconducting motor of 30 kVA which will be fabricated. Further, the distinguished features in its operation, as expected in the foregoing, are verified by the computer simulation study in comparison with a conventional machine in terms of a high specific power density, an extension of stable power limit, and so on.