A separately excited dc motor (see the equivalent circuit
Chapter 16, Problem P16.46(choose chapter or problem)
A separately excited dc motor (see the equivalent circuit shown in Figure 16.21 on page 780) has RA = 1.3 and VT = 220 V. For an output power of 3 hp, nm = 950 rpm and IA = 12.2 A. The field current remains constant for all parts of this problem. a. Find the developed power, developed torque, power lost in RA, and the rotational losses. b. Assuming that the rotational power loss is proportional to speed, find the no-load speed of the motor.
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