MAGNETIC FIELDS AND INDUCTANCES OF HELICAL WINDINGS WITH 120° PHASEBANDS |
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| Authors: | M R BAILEY J R BUMBY B I HASSALL A F ANDERSON |
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| Affiliation: | 1. Department of Engineering Science , University of Durham , Durham, DH1 3LE, England;2. Department of Electrical and Electronic Engineering , University of Leeds , Leeds, England;3. N. E. I. Parsons , Newcastle-upon-Tyne, England |
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| Abstract: | ABSTRACT In the development of superconducting a.c. generators the essential air-cored nature of the generator, and the large power output per unit length, suggests that conventional armature windings may not necessarily be the most suitable. One possible alternative is the helical armature winding (3) - (8) and has been proposed both as a means of obtaining a uniformly supported armature structure and for generating at transmission line voltages. This paper discusses the peculiarities of helical windings, and in particular those with 60 and 120° phase-bands. Magnetic field and inductance measurements are made on a three phase model with a phase spread of 120° and compared with calculated values using a previously published theory (4). Computed and measured values of synchronous inductance agree to within 1%. |
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