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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7°
THE DISEASES OF
start with a break in one phase; a break in two phases
will, however, cause it to stop, since it is obvious that
no current can flow in the third phase.
From the above it follows that faults with poly-
phase motors are much rarer than with continuous-
current motors, as may be confirmed at any time
from actual practice. The only part of them that
requires attention is the lubrication of the bearings,
and as this is usually automatic, with oil-rings, inspec-
tion is necessary only at long intervals. It need
hardly be added that where motors are used in a
dusty workshop, they should be protected with gauze
or perforated metal over the openings in their frames ;
and may occasionally need to be opened to remove
dust. Beyond this, induction motors rarely need any
attention whatever. We therefore close this chapter,
and turn to the consideration of the troubles met with
in transformer work.
Fig. 32.