Electromagnetic Braking System

Electromagnetic Braking SystemName: William Gaskey, Sandip Mistry, Duy Nguyen, Jee Yoon

Team No.: 4Course/Section: ELET4308/12652Instructor: Dr. Farrokh Attarzadeh

University of HoustonCollege of TechnologySemester: Fall 2006

Outline• Executive Summary• Product Requirements• Design Alternatives• Design Specifications• Design Description• Construction Details• Costs• Conclusions• Questions & Comments

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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

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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

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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

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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

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Design Specifications

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• Mini-Max 51-C2 8051 Microcontroller• 2001 Toyota Corolla hub and spindle

assembly• Three GP-2030/24VDC electromagnets• MC2 Microcon pedals

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] outputInput

Square Wave

12 [V] power

42 [V] power

Amplified output

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Design Description• Circuit board

– LM317T voltage regulator to regulate input voltage

– BUK-555 60A MOSFET as a switch

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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

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Start

Parameter Setup

Voltage Reading

Generate Delay

Generate Delay

OFF State

ON State

Construction Details

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Costs

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Project Cost

PartsLaborEquipments

21% 3%

76% $19,810.78 Total

$ 4,183.43 Equipments

$15,000.00 Labor

$ 627.35 Parts

CostCategory

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

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Questions & Comments

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