308

ELEC TRICAL APPA RA T US

S = speed; s = 1 — S = slip, as fraction of synchronism.
The equation of the primary circuit is then, by (7):.

EQ = Zo7o + Z(/0-/i). (14)

The equation of the secondary circuit:

0 = Zlll + Z (A - /o) + JSZ (jh - j/o), (15)

from (15) follows:

7. fl — .Q\ 7o

(16)

FIG. 148.

and, substituted in (14):
Primary current:

/O = #0 >

Zs +

ZZQs.+

Secondary current:

Ji = 1
Exciting current:

/oo = /o —
E.m.f. of rotation:

ZS

ZZi

(17)

(18)

(19)

(20)