June 24, 2007
June 24, 2007
June 27, 2007
Division Experimentation & Lab-Oriented Studies
12.921.1 - 12.921.12
Integrating Microcontrollers into a Modern Energy Conversion Laboratory Course
Rick Haub, Robert Fourney and Steven Hietpas Abstract
For six years South Dakota State University has implemented major revisions to the Energy Conversion Course to include advanced topics in the area of electric drives. With these changes, the course name has been changed to Electromechanical Systems (required 400-level course with lab) to better reflect the content of the course that emphasizes a systems approach to teaching machines, power electronics, and the use of microprocessors in an electric drive system. Over these six years the development of DC permanent magnet and AC inductions motor drive systems has provided more advanced study within the lecture and required laboratory course, wherein students model power electronic drives and motors, conduct simulations to predict system behavior, and then conduct experiments to verify these predictions. The last stage of development in the upgrading of this course and laboratory has focused on a meaningful integration of the microprocessor and its use in electromechanical systems. This paper describes three AC induction motor laboratory exercises, including the objectives and the required hardware and software needed. Exercise 1 follows more traditional exercises concerning the circuit modeling of a 3-hp 3-phase induction motor but with added emphasis in establishing key motor parameters useful in the design of a V/Hz motor drive. Exercise 2 builds on this model and allows students to design/establish key gain parameters for an in-house open-loop V/Hz motor drive that results in optimal speed performance of the induction motor for a given operating point. The in-house V/Hz motor drive has a user interface that allows direct manipulation of these key gain parameters. Exercise 3 provides students a culminating experience requiring them to use their knowledge of the motor and electric drive system to write and implement a pulse-width-modulation and frequency control algorithm that produces the required drive signals to the power stage of the electric drive. This approach is a distinct shift from a traditional machines laboratory approach, by providing an innovative means to exposing students to a realistic microprocessor-based application, while helping them to gain a complete understanding of a modern electromechanical system.
South Dakota State University designed and constructed a unique electric machines laboratory, which was completed in 20021-2 to accommodate major revisions to the required Energy Conversion Course that now includes advanced topics in the area of electric drives3-4. Additionally, efforts have been made to also include elements of control systems theory5. The final addition to the course provides an avenue for students to use their knowledge of microprocessors, assembly and C languages in the coding of a pulse-width-modulation and frequency control algorithm needed in a volts/Hertz (V/Hz) 3-phase induction motor drive.
Proceedings of the 2007 American Society for Engineering Education Annual Conference & Exposition Copyright 2007, American Society for Engineering Education
Haub, R., & Fourney, R., & Hietpas, S. (2007, June), Integrating Microcontrollers Into A Modern Energy Conversion Laboratory Course Paper presented at 2007 Annual Conference & Exposition, Honolulu, Hawaii. 10.18260/1-2--1917
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