INDUCTION MOTOR 37

hence, absolute:

00

63 = (24)

io = ^3 diM-^2, ' (25)

e2 =e*<Jl + ^|2> (26)

e3 = e3 VoTT^2- (27)
26. The torque of the innermost squirrel cage thus is:

D, = ~f ; (28)

that of the middle squirrel cage:

and that of the outer squirrel cage:

(80)

the total torque of the triple squirrel-cage motor thus is :
D-D, + D2 + Z>3, (31)
and the power:
P = (1 - s] D, . (32)
the power input is:
Po = /#,, /o/'
= 632 (AflTi + dtf»), (33)
and the volt-ampere input:
Q = 60io. • (34)
P
Herefrom then follows the power-factor -^ the torque effi-
D ^ D P
ciency TT, apparent torque efficiency -rf power efficiency p
Jr o (& A o
and apparent power efficiency g-
27. As illustrations are shown, in Figs. 16 and 17, the speed
and the load curves of a triple squirrel-cage motor with the
constants:
eo = 110 volts;
Z0 = 0.1 +0.3J;
Zl = 0.8 +0.1.;;
£2 = 0.2 +0.3J;
Zz = 0.05 + 0.8 j;
7o = 0.01 - O.lj;