η
83.787%
=
100%
η
P
out
P
in
=
P
in
8.9kW
=
P
in
V
t
I
rated
⋅
=
P
rot
430.93W
=
P
rot
P
dev
P
out

=
thus
P
out
7.457kW
=
P
dev
7.888kW
=
P
dev
I
a
E
a
⋅
=
E
a
243.189V
=
E
a
V
t
I
a
R
a
⋅

=
I
a
32.435A
=
I
a
I
rated
I
f

=
I
f
3.165A
=
I
f
V
t
R
f
R
rh
+
=
b.
E
a
a.
R
f
R
rh
R
a
n
rated
3500
rev
min
⋅
=
R
a
0.21
Ω
⋅
=
I
rated
35.6 amp
⋅
=
R
rh
43
Ω
⋅
=
R
f
36
Ω
⋅
=
V
t
250 volt
⋅
=
P
out
10 hp
⋅
=
Problem 1111:
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