Power Angle Characteristic of Salient Pole Machine

Power Angle Characteristic of Salient Pole Machine

Neglecting the armature winding resistance, the power output of the generator is given by:

synchronous machine. This also shows that it is possible to generate an emf even if the excitation E₀ is zero. However this magnitude is quite less compared with that obtained with a finite E₀. Likewise It is clear from the above expression that the power is a little more than that for a cylindrical rotor synchronous machine, as the first term alone represents the power for a cylindrical rotor synchronous machine. A term in (sin 2s) is added into the power - angle characteristic of a non-salient pole we can show that the machine develops a torque - called the reluctance torque - as this torque is developed due to the variation of the reluctance in the magnetic circuit even if the excitation E₀ is zero. Fig: shows the typical power angle characteristic of a salient pole alternator.