In: Electrical Engineering
A 440 VDC, 60hp, cumulative compound long shunt motor has an armature resistance of .1 Ohm, a series field resistance of ??? Ohms and a shunt field resistance of 80 Ohms. The brush drop is a constant 2 volts. The stray losses are 2.5 kW. The CEMF at rated load is 393 volts. Draw the electrical circuit, then determine the following for the above conditions:
A. The armature current:
B. The power developed by the armature:
C. The resistance of the series field:
D. The starting current if motor is directly connected across the 440 line voltage?
E. The value of a starting resistor to limit the initial current to 150A.
F. The nominal line current when operating at full load?
In case you have any doubts or you did not understand any step please feel free to ask your doubts in the comments section. I would be happy to clarify it.