The Diseases Of Electrical Machinery
Forfatter: Ernst Schulz
År: 1904
Forlag: E. & F. N. SPON, Ltd.
Sted: London
Sider: 84
UDK: 621.311
Edited with a preface, by Silvanus P. Thompson
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ELECTR1CAL MACHINERY.
5i
CHAPTER II.
SINGLE-PHASE AND POLYPHASE GENERATORS.
Generators with Rotating Armatures.—Until
recently it was not unusual for single-phase and poly-
phase generators to be built with rotating armatures,
with two or three slip-rings for the delivery of the
current. For low pressures (up to about 500 volts)
such machines are still to be found. They are but
little different in design from continuous-current ma-
chines. An advantage is that the most delicate part
of the continuous-current machine, i.e. the commu-
tator, is absent, consequently faults and breakdowns
are much rarer with these machines. The slip-rings
are naturally much more easily insulated from the
spider or the shaft than the commutator.
Faults in the Armature.—Faults do not often
occur with the slip-rings. The armature winding of
such single-phase machines differs from that of a con-
tinuous-current machine, in that while in the latter at
least two, and with multipolar machines usually more
than two, parallel armature paths are present, in the
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