ALTERNATING-CURRENT MOTORS
It is, at synchronism; s = 0:

7c - ^ ;

i 0 — y I /T- ?

309

/i =0;

/oo = /oj

i/o

1 +

At standstill:

S 1 y

/O = V7

+

Q -f- ZZi -[-

JQ -f- j?-^i -f- ^/o^l

y —

^>0

W - 0.

__

o -f- 2>/!!/i -f-

Introducing as parameter the counter e.rn.f., or e.m.f. of mutual
induction:

(21)
(22)

it is, substituted:
Counter e.m.f.:

hence:

Primary impressed e.m.f.:

#o = #

ZZ,

E.m.f. of rotation:
Secondary current

Primary current:

- s).

Zs

(23)
(24)_
(25)
(26)
(27)