ALTERNATING-CURRENT MOTORS

313

177. As an example are shown, in Fig. 149, with the speed
as abscissae, the curves of a polyphase induction motor of the
constants:

<?o = 320 volts,

Z = 1 -f- 10 j ohms,

ZQ = Zi = 0.1 + 0.3 j ohms;
hence:

\0 = Xi = 0.0307 - 0.0069/.

0.1

0.2 0.3

0.4 0.5 0.6
Fro. 149.

1.0

Itis:

D

.320{10-30 s-^ (s + 0.1) y}

(L03 "+T63 $)"- j (O.'fn- 5.99 s)
_______2048(1 - 6')

(1.03 -f- i.63l)"^+l[oyir~'y.9"95)2
P- (1 -«)jD

, _„ 0,11 -5.99 ^

tan 0 = --

amp"

, .

synchronous kw.

tan 0' =

1.03 + 1.63s
± °*1 -
"10.37 ;
cos (^7 — 0") = power-factor.
Fig. 149 gives, with the speed S as abscissae: the current, /;
the power output, P; the torque, D; the power-factor, p-, the
efficiency, ^.