(a) A $250 \mathrm{~kW}, 500 \mathrm{~V}, 600 \mathrm{rpm}$ de generator is built with an armature diameter of 0.75 m and a core length of 0.3 m . The lap connected armature has 720 conductors. Using the data obtained from this machine, determine the armature diameter, core length, number of armature slots, armature conductors and commutator segments for a $350 \mathrm{~kW}, 440 \mathrm{~V}, 720 \mathrm{rpm}, 6$ pole dc generator. Assume a square pole face with ratio of pole arc to pole pitch equal to 0.66 . The full load efficiency is 0.91 and the internal voltage drop is 4\% of rated voltage. The diameter of commutator is 0.7 of armature diameter. The pitch of commutator segments should not be less than 4 mm . The voltage between adjacent segments should not exceed 15 V at no load.
Explanation
The design parameters are calculated using the machine's power rating, voltage rating, and rotational speed. The armature diameter and core length are determined based on the machine's power rating and voltage rating, and the number of armature slots and conductors are determined based on the machine's power rating and rotational speed.
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