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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42
THE DISE ASES OF
nected in series with it. In no circumstances should
the connections be made as in Fig. 21, where the shunt
is now parallel to the armature alone. In that case
when switching in, only a weak current will flow
Fig. 21.
Fig. 22.
through the shunt, and the motor will not exert any
torque, i.e. will not start.
Until recently the arrangement shown in Fig. 22
was often used in order to prevent sparking when
Fig. 23.
switching off the motor. The shunt winding is con-
nected directly to the leads and remains in circuit at
the end of the run, until opened by means of a special
switch when the motor is stopped. A very simple