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

Research Motors Drives Energy Storage Power Conversion Existing Products

Regenerative Braking Test Bench

Simulink Model of Test Bench

Simulink Model – Drive

Simulink Model – Regeneration

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

Battery Voltage vs Generator Voltage

Switching Voltage Regulator

Voltage and Regulated Current

Simulink Model of Switching Voltage Regulator

Inductor Problem

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

Questions

?