FREQUENCY CONVERTER

185

Po < 0; that is, the primary circuit produces electrical power
from the mechanical input.

At:.

T "~j~" 7*i ~j~ STi == U, Or, 5 == ~ ,

the electrical power produced in the primary becomes less than
required to cover the losses of power, and Po becomes positive
again.
We have thus:

7*1

consumes mechanical and primary electric power; produces
secondary electric power.

- ^-i^-1 < s < 0

consumes mechanical, and produces electrical power in primary
and in secondary circuit.

0 < s < I

consumes primary electric power, and produces mechanical and
secondary electrical power

1 < s

consumes mechanical and primary electrical power; produces
secondary electrical power.

108. As an example, in Fig. 62 are plotted, with the slip, s, as
abscissae, the values of:

Secondary electrical output as Curve L;
total internalloss as Curve II.;

mechanical output as Curve III.;

primary electrical output as Curve IV.;

for the values:

= 100.0;
= 0.1;
= 0.2;

r = 0.4;
x = 0.3;

I"