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376

ELECTRICAL APPARATUS

With switch 0 open the starting resistance-is in circuit; closing
switch 0 short-circuits the starting resistance and gives the run-
ning conditions of the motor.

With all the other switches open the motor is a conductively
compensated series motor.

FAG

FIG. 181.—Alternating-current commutator motor arranged to operate
either as series or repulsion motor.

Closing 1 gives the inductively compensated series motor.
Closing 2 gives the repulsion motor with primary excitation.
Closing 3 gives the repulsion motor with secondary excitation.
Closing 4 or 5 or 6 or 7 gives the successive speed steps of the
series repulsion motor with armature excitation.

FIG. 182.—Alternating-current commutator motor arranged to operate
cither as series or repulsion motor.
Connecting, in Fig. 182, the field, F, between armature, A} and
compensating winding, (7, the resistance, 72, is again controlled by
switch 0.
All other switches open gives the conductively compensated
series motor.