Scribd
Upload
67 views18 pages

Psds Unit1

The synchronous machine has three-phase stator windings and four rotor windings including a field winding. The rotor also has damper coils to represent amortisseur circuits or eddy currents. The basic equations of the synchronous machine are derived using assumptions that the m.m.f. in the air gap is sinusoidally distributed, saliency is only in the rotor, stator slots do not affect rotor inductances, hysteresis is ignored, and saturation is ignored. The stator voltage equation factors in the self and mutual inductances of the stator and between the stator and rotor windings.

Uploaded by

Manohar Potnuru
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
67 views18 pages

Psds Unit1

The synchronous machine has three-phase stator windings and four rotor windings including a field winding. The rotor also has damper coils to represent amortisseur circuits or eddy currents. The basic equations of the synchronous machine are derived using assumptions that the m.m.f. in the air gap is sinusoidally distributed, saliency is only in the rotor, stator slots do not affect rotor inductances, hysteresis is ignored, and saturation is ignored. The stator voltage equation factors in the self and mutual inductances of the stator and between the stator and rotor windings.

Uploaded by

Manohar Potnuru
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 18

Unit-I

Modelling of Synchronous Machines


Modelling of synchronous Machine:

The synchronous machine has a three phase armature windings (a, b and c) on the stator and
four windings on the rotor including the field winding 'f'. The amortisseur (or damper) circuits in
the salient pole machine or the eddy-current effects in the rotor are represented by a set of coils
with constant parameters. Three damper coils, 'h' in the d-axis and g, k on the q-axis are shown
below.

The following assumptions are used in the derivation of the basic equations of the synchronous
machine.

1. The m.m.f in the air gap is distributed sinusoidally and the harmonics are neglected.
2. Saliency is restricted to the rotor.
3. The stator slots cause no appreciable variation of the rotor inductances with rotor position.
4. Magnetic hysteresis is ignored.
5. Magnetic saturation is ignored.
.
LSS=self inductance of stator windings; Laa2=the inductance due to the 2 nd order flux linkages.
Lsr= Mutual inductance between stator and rotor windings
The stator voltage equation is

You might also like