DocumentCode :
1404803
Title :
Brush contact losses due to load and parasitic currents in polyphase commutator motors
Author :
Mainer, O.E.
Volume :
107
Issue :
12
fYear :
1960
fDate :
9/1/1960 12:00:00 AM
Firstpage :
283
Lastpage :
287
Abstract :
After brief reference to present methods of measurement, the interdependence of the brush losses due to load and parasitic currents is discussed and the need for measuring them simultaneously is argued. Owing to the impossibility of doing this satisfactorily on a motor, an apparatus for simulating brush parasitic currents is described and test data obtained with this apparatus are used to establish the argument. The effects of rotor power factor and speed on the losses are also discussed and established experimentally. Finally, a new test is described by means of which the total rotor I2R losses of a polyphase commutator motor can be measured with reasonable accuracy. Curves obtained by this method of test using plain and sandwich brushes show the dependence of these losses on the coil e.m.f. between segments.
Keywords :
commutator motors; commutators; electrical contacts; losses;
fLanguage :
English
Journal_Title :
Proceedings of the IEE - Part C: Monographs
Publisher :
iet
ISSN :
0369-8904
Type :
jour
DOI :
10.1049/pi-c.1960.0043
Filename :
5245396
Link To Document :
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