DocumentCode :
1438624
Title :
Multispeed induction motor fed from a switched single-phase supply
Author :
Broadway, A.R.W. ; Lee, Y.W. ; Chan, H.Y.F.
Author_Institution :
University of Bristol, Department of Electrical & Electronic Engineering, Bristol, UK
Volume :
125
Issue :
5
fYear :
1978
fDate :
5/1/1978 12:00:00 AM
Firstpage :
400
Lastpage :
406
Abstract :
A relatively simple naturally-commutated switching system is described which enables a polyphase a.c. motor to be operated as a speed-changing single-phase motor. A single-phase supply, of fixed frequency, is converted to a polyphase supply consisting mainly of a complementary pair of adjustable component frequencies. When supplied to a polyphase winding, an alternating m.m.f. is produced, the speed of which can be correspondingly adjusted. Natural commutation permits efficient operation at discrete speeds only, but several speeds below and above the normal synchronous speed are possible. The method of supply can, in principle, be applied to all types of polyphase a.c. machines, but special attention is given to the conventional squirrel-cage induction motor. Theoretical results obtained froni an idealised analytical treatment are compared with test results on a 5-speed experimental system.
Keywords :
commutation; induction motors; switching systems; AC motor; multispeed induction motor; naturally commutated switching system; polyphase winding; squirrel cage induction motor; switched single phase supply;
fLanguage :
English
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
Publisher :
iet
ISSN :
0020-3270
Type :
jour
DOI :
10.1049/piee.1978.0096
Filename :
5252791
Link To Document :
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