DocumentCode :
1046406
Title :
A Two-Speed Salient-Pole Synchronous Motor
Author :
Wieseman, Robert W.
Author_Institution :
General Electric Co., Schenectady, New York.
fYear :
1925
Firstpage :
436
Lastpage :
446
Abstract :
The design features and performance characteristics of salient-pole synchronous motors are well known and have been thoroughly covered in the technical press. The synchronous motor has been handicapped in the past because it is inherently a singlespeed machine, and a change in speed could be obtained only by a change in the frequency of the power supply. Changing the frequency, however, is not practical in most applications. The special pole described in this paper which allows two-speed operation of a synchronous motor to be obtained at high efficiency is a new feature2. The same principle applied to a generator enables two frequencies to be obtained at the sgame speed or the same frequency at two different speeds. All that is necessary to change the speed (or frequency) is a pole-changing switch for the stator winding and a reversing switch for the rotor winding. A 5000/2500-h. p., 600/300-rev. per min., two-speed synchronous motor was built without having first constructed a model of any kind. This motor proved to be entirely satisfactory and its characteristics obtained by test aggreed very closely with the calculated characteristics. At either speed the two-speed synchronous motor functions exactly as the ordinary synchronous motor. There is nothing special or complicated about its construction, it does not require any more attention than the ordinary synchronous motor, and its expense of maintenance is just the same.
fLanguage :
English
Journal_Title :
American Institute of Electrical Engineers, Transactions of the
Publisher :
ieee
ISSN :
0096-3860
Type :
jour
DOI :
10.1109/T-AIEE.1925.5061125
Filename :
5061125
Link To Document :
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