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ME 3263 Lab #6
Ethan Lovallo and Ateeb Rahman
Introduction
The goal of this experiment is to measure the response of a DC motor with an applied voltage of 12
volts. DC motors are devices that input a continuous direct current and output rotary motion. DC motors can
be described using a first order differential equation which, when combined with the graphical analysis, will
allow the determination of all unknown variables. In order to meet all of the algebraic conditions, the
experiment will be conducted once with no additional resistance and once with additional resistance. The time
constant 𝜏 and the steady-state gain 𝑘 are two unknowns that will be determined to describe the behavior of
the system. There are various other unknowns that describe the system that will also be calculated in this lab.
By utilizing three unique methods of graphical analysis, the unknown variables will be calculated. The three
methods of graphical analysis are 1. Inspection, 2. The Slope of the Response, and 3. Linear Regression. The
purpose of this experiment is to find the response to an applied voltage to a DC motor and be able to define
the system by finding various system constants and variables.
Methods
