Date of Award

5-1-2024

Language

English

Document Type

Master's Thesis

Degree Name

Master of Science (MS)

College/School/Department

Department of Electrical and Computer Engineering

Dissertation/Thesis Chair

James R Moulic

Committee Members

James R Moulic, Gary J Saulnier, Mohammed Agamy

Keywords

Circuit Analysis, Current, Model, Regenerative Braking

Subject Categories

Electrical and Electronics

Abstract

The literature surrounding regenerative braking systems deals heavily with control system analysis and less to do with the electrical analysis of the circuitry itself. This thesis develops a step-by-step current flow model for a single-phase brushed DC motor regenerative braking system using the RL unit step-response equation as a starting point. This model and the equations derived from it will be analyzed to see what limitations arise from the circuitry on the overall performance of the system, such as non-ideal resistances, switching delays, and affects from current draw of accessory circuitry. The efficiency will be calculated in the context of the percentage change between the peak charge returned to the battery in an ideal and non-ideal model, with the non-ideal model consisting of the non-ideal resistances and switching delays. Each chapter will expand the model to include more non-ideal elements such as to make the resulting equations more accurate to a real-world system, and the accuracy of the equations will be determined through comparison with measured values found using a MATLAB model made using the initial current flow equations. Comparison with the model showed a great deal of accuracy for the calculated parameters using the equations derived in this thesis, and inaccuracies are explained through the approximations that were necessary to take in order for algebraic derivations to be possible. Through the derivation and analysis of these models and equations, this thesis will provide a mathematical framework for quantitatively analyzing and comparing the performance of regenerative braking systems, as well as how the different non-ideal elements affect the system.

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