Power Angle Characteristics of Cylindrical Rotor Synchronous Machine and Two Reaction Model of Salient Pole Machine.
In case of cylindrical rotor machine,the reluctance to air gap flux is uniform at any position of rotor and therefore effect of armature reaction fluxes and voltage induced can be treated in a simple way.But in case of salient pole machine the reluctance to air gap flux is not uniform at any position of rotor due to the asymmetrical construction of rotor.So, inductance and hence reactance of armature coil is not constant unlike in a cylindrical rotor.
Summary
In case of cylindrical rotor machine,the reluctance to air gap flux is uniform at any position of rotor and therefore effect of armature reaction fluxes and voltage induced can be treated in a simple way.But in case of salient pole machine the reluctance to air gap flux is not uniform at any position of rotor due to the asymmetrical construction of rotor.So, inductance and hence reactance of armature coil is not constant unlike in a cylindrical rotor.
Things to Remember
- The synchronous motor with salient pole but without field excitation or field winding is known as reluctance motor.
- On deriving power angle characteristics of cylindrical rotor, Ra of the machine is neglected and Xs is only considered.
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Power Angle Characteristics of Cylindrical Rotor Synchronous Machine and Two Reaction Model of Salient Pole Machine.
Power angle characteristics of cylindrical rotor synchronous machine:
Let us consider a synchronous machine connected to the infinite bus having a voltage of (Vt) also resistance Ra of machine neglected and only (Xs) is considered.
By solving the phasor diagrams.We can calculate;
This equation is known as phase angle equation of synchronous machine having cylindrical rotor.
The electrical power output for the salient pole machine is;
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Which gives the total power developed due to salient pole machine.
Lesson
Three Phase Synchronous Motor
Subject
Electrical Engineering
Grade
Engineering
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