# A shunt fed DC motor runs at 1045rpm, with a constant field current, while drawing an armature…

ECE 2000 Electrical & Computer Engineering Principles Dept. of Electrical and Computer Engineering DT Homework Assignment #12 Due Tuesday December 3, 2019 LAST ASSIGNMENT OF THE SEMESTER ! 1. (10 points) A shunt fed DC motor runs at 1045rpm, with a constant field current, while drawing an armature current of 50A from a 120V DC source. If the armature resistance is 0.1 O and the load on the motor changes such that the armature now draws 95A from the same 120V source, determine the motor speed at this load. 2. Consider a transistor-based motor control. Its schematic is shown below. R3 is a variable resistor and the armature resistance of the motor (shown as M1 and assumed to be an ideal motor) is 0.8 Ohms.

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