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Table 1 DFI-Motor
Parameters
Parameter
Value
Rated power
P
n
=4kW
Stator
—
rotor voltages
u
s
= 400 V
Stator
—
rotor currents
I
s
= 8.4 A, I
r
=19A
Synchronous speed
x
sn
¼ 2
p
50 Hz
Stator resistance
R
s
= 1.3740
Ω
Rotor resistance
R
r
= 0.1000
Ω
Stator inductance
L
s
= 0.2241 H
Rotor inductance
L
r
= 0.0287 H
Mutual inductance
M = 0.0740 H
J = 0.01862 Nm/rad/s
2
Inertia
Friction coefficient
k
f
= 0.01400 Nm.s/rad
Pole pairs
p = 2
(a)
(b)
200
6
150
4
100
2
50
0
0
-2
0
0.5
1
0
0.5
1
time (s)
time (s)
(c)
(d)
40
4000
2000
20
0
0
-2000
-20
0
0.5
1
0
0.5
1
time (s)
time (s)
Fig. 5 Simulation results: a Tracking of the rotor speed: x
1
(solid line) and x
1d
(dotted line).
b Estimation of the load torque: the estimate
C
l
(solid line) and the actual value
C
l
(dotted line).
c Electromagnetic torque. d Stator reactive power
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