Environmental Engineering Reference
In-Depth Information
20
1500
16
1200
12
900
N
T
T
8
600
4
300
0
0
0
3
6
9
12
V
m/s
Figure 14: The relative rotational speed and torque of the tandem wind rotor
against the wind velocity.
300
E
1
= 200 V,
f
1
= 60 Hz
250
E
1
200
150
E
2
100
f
1
50
f
2
0
-50
0
3
6
9
12
V
m/s
Figure 15 : Control of the frequency
f
2
and voltage
E
2
against the wind velocity.
while the rotation of another separate motor is transmitted to the outer armature
through the timing belt.
Figure 18 shows the relation between the outer armature rotational torque
T
F
*
and the inner armature rotational torque
T
R
*
, in keeping the rotational speed of the
outer armature constant at
N
F
= 750 min
− 1
, while changing the rotational speed of
the inner armature
N
R
at the various external loads. These rotational torques do not
include the mechanical torques such as the bearings in the generator, and
T
F
*
is
given by the absolute value though the direction of
T
R
*
is against
T
F
*
. It is obvious
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