358 ELEMENTS OF ELECTRICAL ENGINEERING

impedance, primary plus secondary, is that of both motors,
that is, doubled also, and the characteristic constant of the con-
catenated couple is thus four times that of a single motor, but
the speed reduced to one-half.

Sfp,

CONCATENATION OF
INDUCTION

0.3 j

2CJOO

Y<* 0.01 - 0.1 j1

PER
CENT
100

PER
CENT
100

10

I

I

2(00

FIR T MOTOR

FIG. 192.—Comparison of concatenated motors with a single motor of
double the number of poles.

Comparing the concatenated couple with a single motor re-
wound for twice the number of poles, that is, one-half speed
also, such rewinding does not change the self-inductive impe-