Page 220 - Solutions Manual to accompany Electric Machinery Fundamentals

Chapter 8: DC Motors and Generators

Problems 8-1 to 8-12 refer to the following dc motor:
P rated = 30 hp I L,rated = 110 A
V = 240 V N F = 2700 turns per pole
T
n rated = 1800 r/min N SE = 14 turns per pole
R A = 0.19  R F = 75 
R S = 0.02  R adj = 100 to 400 
Rotational losses = 3550 W at full load
Magnetization curve as shown in Figure P8-1

Note: An electronic version of this magnetization curve can be found in file
p81_mag.dat, which can be used with MATLAB programs. Column 1
contains field current in amps, and column 2 contains the internal generated
voltage E A in volts.
In Problems 8-1 through 8-7, assume that the motor described above can be connected in shunt. The equivalent
circuit of the shunt motor is shown in Figure P8-2.

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