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Electric Motor Control with Regenerative
BrakingCody Doremus & Keegan Roach
Advisor: Mr. GutschlagBradley Electrical Engineering Senior
Design Project
Regenerative Breaking - Overview Regenerative braking is used to improve
the efficiency (fuel economy) of: Electric Vehicles Hybrid Vehicles Industrial Applications
Lowers operation costs
Regenerative Breaking - Overview
Batteries Motor Kinetic Energy
Energy Flow: Acceleration
Batteries Motor Kinetic Energy
Energy Flow: Regenerative Braking
Brakes Kinetic Energy
Energy Flow: Traditional Braking
HeatLoss
Speed of VehicleKe=½ * M * V2
Project Goals Design and implement a test bench to
determine the efficiency of regenerative braking
Develop and verify a model for regenerative braking
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
Armature Voltage Comparison
0 0.5 1 1.5 2 2.5 3 3.5 4-20
0
20
40
60
80
100
120Comparison of 115V Data with Regenerative Resistor
Time [s]
Vol
tage
[V]
Regenerative Resistor Current Comparison
0 0.5 1 1.5 2 2.5 3 3.5 4-0.5
0
0.5
1
1.5
2
2.5Comparison of 115V Data with Regenerative Resistor
Time [s]
Cur
rent
[A]
Energy Used by the System
0 0.5 1 1.5 2 2.5 3 3.5 40
50
100
150
200
250
300
350Energy Used by the System
Time [s]
Ene
rgy
[J]
Influence of Resistance
0 10 20 30 40 50 600.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9Efficiency as effected by Resistance
Resistance
effic
ienc
y
Influence of Viscous Friction
0 0.005 0.01 0.015 0.02 0.025 0.03 0.0350.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8Efficiency as effected by Viscous Friction
Viscous Friction
Effi
cien
cy
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