A separately excited DC shunt generator produces a no-load voltage of 150 Vdc at 1200 RPM. If the armature resistance is 3 Ohms, calculate the output voltage under the following conditions: (Note all calculations for each problem are to be performed from the base values given above). a) The speed is reduced to 875 RPM. Vout = __________________ b) The field current is increased by 22% (assume a linear field current/flux relationship). Vout = __________________ c) The speed is increased to 1738 RPM Vout = __________________ d) The field current is reduced by 12% and the speed is increased to 1600 RPM Vout = _________________
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 separately excited DC shunt generator produces a no-load voltage of 150 Vdc at 1200 RPM. If the armature resistance
is 3 Ohms, calculate the output voltage under the following conditions: (Note all calculations for each problem are to be
performed from the base values given above).
a) The speed is reduced to 875 RPM. Vout = __________________
b) The field current is increased by 22% (assume a linear field current/flux relationship). Vout = __________________
c) The speed is increased to 1738 RPM Vout = __________________
d) The field current is reduced by 12% and the speed is increased to 1600 RPM Vout = _________________
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