390 ELECTRICAL APPARATUS

hence., substituting (24) and (28) :

mz

(38)

hence positive, or assisting, below synchronism, retarding above
synchronism.

The total Power, or Output of the motor then is:

or:
Power Output:

- V4 ; (39)

X

or, approximately:

ScQe2x

P =

l-*Co(«»+^')

m*

/ + z"//. (41)

hence:
Torque:

-I-

given in synchronous watts.

The power input into the motor, and the volt-ampere input,
are, if:

and:

(42)

given by:
Power Input:
Po = ei'2, (43)