Transcript Electric Motor Control with Regenerative Braking

Electric Motor Control
with Regenerative
Braking
Cody Doremus & Keegan Roach
Advisor: Mr. Gutschlag
Bradley Electrical Engineering Senior
Design Project
Regenerative Breaking - Overview

Regenerative braking is used to improve
the efficiency (fuel economy) of:
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Electric Vehicles
Hybrid Vehicles
Industrial Applications
Lowers operation costs
Regenerative Breaking - Overview
Energy Flow: Acceleration
Batteries
Motor
Speed of Vehicle
Ke=½ * M * V2
Kinetic
Energy
Energy Flow: Traditional Braking
Heat
Loss
Brakes
Kinetic
Energy
Energy Flow: Regenerative Braking
Batteries
Motor
Kinetic
Energy
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
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Spin off of a current Bradley Mechanical
Engineering electric vehicle project
Scope changes
1.
Full scale regenerative braking prototype
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2.
3 phase servo motor
Regenerative braking test bench
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DC brushed motor
Research
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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
Comparison of 115V Data with Regenerative Resistor
120
100
Voltage [V]
80
60
40
20
0
-20
0
0.5
1
1.5
2
Time [s]
2.5
3
3.5
4
Regenerative Resistor Current
Comparison
Comparison of 115V Data with Regenerative Resistor
2.5
2
Current [A]
1.5
1
0.5
0
-0.5
0
0.5
1
1.5
2
Time [s]
2.5
3
3.5
4
Energy Used by the System
Energy Used by the System
350
300
Energy [J]
250
200
150
100
50
0
0
0.5
1
1.5
2
Time [s]
2.5
3
3.5
4
Influence of Resistance
Efficiency as effected by Resistance
0.9
0.85
efficiency
0.8
0.75
0.7
0.65
0.6
0.55
0
10
20
30
Resistance
40
50
60
Influence of Viscous Friction
Efficiency as effected by Viscous Friction
0.8
0.7
Efficiency
0.6
0.5
0.4
0.3
0.2
0.1
0
0.005
0.01
0.015
0.02
Viscous Friction
0.025
0.03
0.035
Battery Voltage vs Generator Voltage
Switching Voltage Regulator
Voltage and Regulated Current
Simulink Model of Switching Voltage
Regulator
Inductor Problem
Tasks for Future Project
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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