32 ELECTRICAL APPARATUS

hence, the total torque:

D = Z>2 + Dx, (21)

and the power output1

P = (1 - s) D. (22)

(Herefrom subtracts the friction loss, to give the net power
output.)
The power input is:

Po = /#>, Jo/'

(23)

and the volt-ampere input:
Q = eofcO-
r>
Herefrom then follows the power-factor 7^ the torque effi.-
D D
ciency H~, the apparent torque efficiency TT, the power efficiency
r o tj
P P
p- and the apparent power efficiency ^*
* 0 v*f
23, As illustrations are shown, in Figs. 14 and 15, the speed
curves and the load curves of a double squirrel-cage induction
motor, of the constants:
eo = 110 volts;
Z0 = 0.1 + 0.3j;
Zl = 0.5 + 0.2 j;
Z2 = 0.08 + 0.4 j;
Fo = 0.01 -0.1 j;
the speed curves for the range from 5 = 0 to s = 2, that is, from
synchronism to backward rotation at synchronous speed. The
total torque as well as the two individual torques are shown on
the speed curve. These curves are derived by calculating, for
the values of s:
5 = 0, 0.01, 0.02, 0.05, 0.1, 0.15, 0.2, 0.3,
0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2,0,