1. Electric Motor Control with Regenerative Braking Cody Doremus & Keegan Roach Advisor: Mr. Gutschlag Bradley Electrical Engineering Senior Design Project

2. Regenerative Breaking - Overview Regenerative braking is used to improve the efficiency (fuel economy) of: Electric Vehicles Hybrid Vehicles Industrial Applications Lowers operation costs

3. Regenerative Breaking - Overview

4. Project Goals Design and implement a test bench to determine the efficiency of regenerative braking Develop and verify a model for regenerative braking

5. Background Information Spin off of a current Bradley Mechanical Engineering electric vehicle project Scope changes 1. Full scale regenerative braking prototype 3 phase servo motor 2. Regenerative braking test bench DC brushed motor

6. Research Motors Drives Energy Storage Power Conversion Existing Products

7. Regenerative Braking Test Bench

8. Simulink Model of Test Bench

9. Simulink Model – Drive

10. Simulink Model – Regeneration

11. Armature Voltage Comparison

12. Regenerative Resistor Current Comparison

13. Energy Used by the System

14. Influence of Resistance

15. Influence of Viscous Friction

16. Battery Voltage vs Generator Voltage

17. Switching Voltage Regulator

18. Voltage and Regulated Current

19. Simulink Model of Switching Voltage Regulator

20. Inductor Problem

21. Tasks for Future Project Replace the resistor with a battery and switching voltage regulator Model the switching voltage regulator in Simulink Develop electronics to use regeneration on an AC Servo Motor

22. Questions ?