By Carion Pelton, Oklahoma State University
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OverviewThis experiment will reinforce your understanding of the concept of frequency response. As part of the experiment, you will find the open loop frequency response of a DC motor with an attached load. You will find the frequency response by applying a sinusoidal voltage, for multiple frequencies, into the motor. For each frequency, you will record the motor's output position and velocity. You will compare the magnitude of the output position and velocity waveforms to the magnitude of the input voltage, and you will generate Bode magnitude plots for both output position and velocity. Then you will estimate the motor's first order transfer function from the experimental velocity Bode plot. Finally, you will generate Bode plots for the estimated transfer functions and compare them to the experimental Bode plots. The comparison will give you insights into the strengths and limitations of linear models of practical physical systems. Click on the Handout PDF link in the right sidebar to download the Experiment Handout. It describes all of the steps you will need to perform to complete the experiment. If you click on the Hardware/Parts link in the right sidebar, you will find a list of all parts needed to perform this experiment and places to order them. Files needed for 3-D printing can be found by clicking on the 3-D Printer Files link. Software that you will need to run the experiment is available from the Software/Code link. What You Will LearnAfter successful completion of this experiment, you will be able to find the frequency response of a DC motor experimentally, and you will be able to use the frequency response to develop a transfer function model for the motor. You will also learn how to use MATLAB commands to verify the motor model. PrerequisitesBefore running this experiment, you should perform the following experiment: Sampling and Data Acquisition. |
Handout PDFHardware/PartsSoftware/Code3-D Printer Files |