INDUCTION MOTOR

65

Figs. 24 and 25 thus give the load characteristics of the motor,
at constant field excitation, corresponding to:

in Fig. 24:
in Fig. 25:

e = 2 e0;

e = 5 CQ.

For different values of the energy current, ii, from zero up to
the maximum value possible under the given field excitation,

00!^
INDUCTION MOTOR ISTANT DIRECT CURRENT EXCITAT e = 2£0 e0=500 Z0=.1-K3j Yo = .O1-.1J Zt = .1-K33 (Z = .14-10.33) SYNCHRONOUS
ON

% 100

s

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ft

90.

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80

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70.

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50
AMPS.
12R

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4
) KW

FIG. 24.—Load curves at constant excitation 2e, of standard induction
motor converted to synchronous motor.

as given by equation (12), the reactive current, i%, is calculated
by equation (1.1) :

Fig. 24:
Fig. 25:

The total current then is :

i2 = 48.5 - \/9410 - *V;
i2 = 48.5 -

the volt-ampere input:
the power input:

5

Q =