5. System of base units-2 7.2
Magnetizing inductance along the direct axis:  
Lmd = Ld - Ldd
Leakage inductance Ldd is neglected
In per-unit system:
Lmd✱ = Ld✱ = Xd✱ = 2.330
Consequently, Lmd = Lmd✱  ·  Lб = 2.33  ·  2.06  ·  10-3  =  5.1  ·  10-3  H
Coupling coefficient between stator and rotor base values:
kf  = 
√ 3
 / 
√ 2
 · 
Mf
Lmd
  = 
1.73
1.41
  · 
50.6
5.1
  · 
10-3
10-3
  =  12
Base excitation current:
Ifб  = 
Iб
kf
  = 
21.4
12
  ·  103  =  1780 A
5.11. Excitation voltage
Ufб  = 
Sб
Ifб
  = 
296
1780
  ·  106  =  166  ·  103  V
5.12. Excitation winding resistance
Rfб  = 
Ufб
Ifб
  = 
166
1780
  · 
103
1
  =  93.2 OM
5.13. Rotor flux linkage
ψfб = Ufб  ·  tб = 166  ·  103  ·  3.18  ·  10-3  = 527.985 Wb
5.14. Rotor inductance
Lfб  = 
ψfб
Ifб
  = 
527.9
1780
  = 0.296 H
5.15. Mutual inductance of rotor and stator
Mfб =
√ Lб · Lfб
 = 
√ 2.06 · 10-3 · 0.296
 = 24.1 · 10-3 H