The document describes the design of an electromagnetic braking system as an alternative to conventional braking systems. Key points: - The objective is to design an electromagnetic braking system that is less costly and higher performing than traditional braking, and requires no maintenance. - The design will use an 8051 microcontroller to control three electromagnets based on input from a brake pedal. This will generate braking force electronically rather than through brake pads. - Alternatives considered were permanent magnets or metallic material around the wheel, but these had issues with cleaning, arrangement, or not providing enough braking force. - The final design specifications include an 8051 microcontroller, Toyota hub/sp

1. Electromagnetic
Braking SystemName: William Gaskey, Sandip Mistry, Duy Nguyen, Jee Yoon
Team No.: 4
Course/Section: ELET4308/12652
Instructor: Dr. Farrokh Attarzadeh
University of Houston
College of Technology
Semester: Fall 2006

2. Outline
• Executive Summary
• Product Requirements
• Design Alternatives
• Design Specifications
• Design Description
• Construction Details
• Costs
• Conclusions
• Questions & Comments
ELET 4308 Team 4 Slide 1 of 13

3. Executive Summary
• Objective: Design an electromagnetic
braking system
– Replacing the conventional braking system
– Less cost with greater performance
– No need for maintenance and/or replacement
• Research: Other types of electromagnetic
braking system
– Electromagnetic braking system with brake pads
– Eddy-current braking system
ELET 4308 Team 4 Slide 2 of 13

4. Product Requirements
• Overall
– Power supply to power the system
– Hub and spindle assembly to simulate the actual
spinning of the rotor
– Custom made rotor with metal arranged for the
most effective result
– Brake pedal to simulate the real environment
– Three electromagnets to generate braking force
ELET 4308 Team 4 Slide 3 of 13

5. Product Requirements (cont’d)
• Hardware and Software
– 8051 microcontroller
• Reading the braking level from pedal
• Varying the braking force through duty cycle
– Custom built circuit board
• Regulating input voltage
• Powering up the 8051 µC
• Amplifying the output voltage to electromagnets
ELET 4308 Team 4 Slide 4 of 13

6. Design Alternatives
• Permanent magnets mounted on the wheel
– Cleaning issue
– Magnet arrangement issue
– Electromagnetic field around other mechanical
components issue
• Metallic material region all around the wheel
– Electromagnetic field dispersion issue
– Not enough braking force
ELET 4308 Team 4 Slide 5 of 13

7. Design Specifications
ELET 4308 Team 4 Slide 6 of 13
• Mini-Max 51-C2 8051 Microcontroller
• 2001 Toyota Corolla hub and spindle
assembly
• Three GP-2030/24VDC electromagnets
• MC2 Microcon pedals

8. Design Specifications (cont’d)
• General view
– Pedal
– 8015 Microcontroller
– Circuit board
– Electromagnets
– DC power supply
Pedal
8051 µC
EM
DC
power
supply
Circuit
board
5 [V]
output
Input
Square
Wave
12 [V]
power
42 [V]
power
Amplified
output
ELET 4308 Team 4 Slide 7 of 13

9. Design Description
• Circuit board
– LM317T voltage
regulator to regulate
input voltage
– BUK-555 60A
MOSFET as a
switch
ELET 4308 Team 4 Slide 8 of 13

10. Design Description
• Programming
– Voltage reading by ADC
– ADC by convert()
function
– ON and OFF state by
setbit() and clrbit()
– Generate delay by
generate_delay()
function
ELET 4308 Team 4 Slide 9 of 13
Start
Parameter Setup
Voltage Reading
Generate Delay
Generate Delay
OFF State
ON State

11. Construction Details
ELET 4308 Team 4 Slide 10 of 13

12. Costs
ELET 4308 Team 4 Slide 11 of 13
Project Cost
Parts
Labor
Equipments
21% 3%
76%
$19,810.78Total
$ 4,183.43Equipments
$15,000.00Labor
$ 627.35Parts
CostCategory

13. Conclusions
• Project was completed on schedule and
within budget thanks to donations
• Supplier issues caused the purchase of
weaker magnets than intended for design
• Good results with current design, a larger
budget would improve performance
• The project proves the theory and shows the
potential for a full functional system
ELET 4308 Team 4 Slide 12 of 13

14. Questions & Comments
ELET 4308 Team 4 Slide 13 of 13