A 4-pole lap-connected armature of a de Shunt generator is required to supply output loads connected as follows: (1) 2.5 kW Geyser connected in series with a 2.5 kw dc motor. (2) 5 kW Lighting load connected in parallel with the above load. If the load voltage is 250v and the Generator have an armature resistance of 0.2 ohm and a field resistance of 250 ohms. The armature has 120 conductors in the slots and runs at 1000 rpm. Allowing 1 V per brush for contact drops and neglecting friction loss, find? 1- Total flux offered by shunt excitation? 2- If the number of poles are doubled what will be the new total flux?
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
A 4-pole lap-connected armature of a dc Shunt generator is required to supply output loads connected as follows:
(1) 2.5 kW Geyser connected in series with a 2.5 kW dc motor.
(2) 5 kW Lighting load connected in parallel with the above load.
If the load voltage is 250v and the Generator have an armature resistance of 0.2 ohm and a field resistance of 250 ohms. The armature has 120 conductors in the slots and runs at 1000 rpm. Allowing 1 V per brush for contact drops and neglecting friction loss, find?
1- Total flux offered by shunt excitation?
2-If the number poles are doubled what will be the new total flux?
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