Oral Presentation for Project Proposal - Bradley University ECE ...

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Redesign of Rotary Inductrack for 

Magnetic Train Levitation 

Bradley University 

Department of Electrical and Computer Engineering 

Senior Capstone Project 

Advisor: 

Dr. Anakwa 

Student: 

Glenn Zomchek


Overview 

– Background information 

– Purpose of Maglev System 

– Previous Work 

– Project Summary 

– Physical Design 

– Controls 

– Parts & Equipment


Overview (cont’d) 

– Specifications for New Maglev System 

– Issues to Address 

– Tentative Schedule 

– References 

– Patents 

– Questions


Background Information 

The inductrack was first developed by Richard F. Post in 

the late 1990’s at Lawrence Livermore National 

Laboratory. 

– 20 meter test track for propulsion


Purpose of Maglev System 

Life-size Life size track and train propulsion system 

Low Speed Urban Maglev Program


Previous Work at Bradley University 

2003-2004 2003 2004 

– Paul Friend 

Initial research 

Equations developed 

GUI created in MATLAB 

Circular wire-rung wire rung inductrack attempted 

– Tony Pederson and Toby Miller 

Linear wire-rung wire rung inductrack attempted 

2005-2006 2005 2006 

– Dusty Funk and Kyle Getsla 

New support structure created 

Laminated sheets inductrack attempted

s 

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Small-Scale Small Scale Maglev System 

1 st 

goal 

st goal 

Project Summary 

– To demonstrate levitation 

2 nd 

goal 

nd goal 

– To use a position sensor to measure the 

displacement in height created by the train levitation. 

– Use the signal created as feedback to the AC motor 

to control the motor speed, creating a closed-loop 

closed loop 

system. 

– To use a digital force gauge to measure the force 

needed to levitate the train to a desired height.


Inductrack: Inductrack 

Physical Design 

Thin sheets of laminated aluminum 

wrapped around bicycle wheel 

Slots cut every 2.2 cm to guide 

eddy currents 

Eddy currents created due 

to moving magnetic field


Maglev Train 

Mass = 0.375 kg 

Halbach array of magnets 

Magnet Strength: 1.21 Tesla 

Halbach wavelength, λ = 5.5 cm


Halbach Array 

When the Halbach array passes over the track, current is 

induced. The current induced in the track creates the 

magnetic field.


Support Structure 

Support structure used in 2005 

Mechanical technician, 

assistance will be used in 

fabrication of new support 

structure 

(David Miller)


Controls 

Overall System Block Diagram 

The Maglev System block consists of the train, Halbach array of 

magnets, rotary wheel, control unit, and AC motor.


Rotary Subsystem Block Diagram 

The rotary subsystem consists of AC power coming directly from from 

the 

wall into a control unit which will control the AC motor. The control control 

unit will be compatible with the servo motor and manually set by the 

user. The AC motor will be connected to the rotary wheel to 

accelerate the wheel to a specified velocity.


Levitation Subsytem Block Diagram 

The levitation subsystem consists of the velocity of the wheel wheel 

creating an 

induced current which in turn creates an induced magnetic force to levitate 

the train. The feedback path will consist of a levitation constant. constant.


Servomotor 

Parts & Equipment 

– Model: Yaskawa SGMGH-20ACB61 

SGMGH 20ACB61 

Rated Speed: 1000 RPM 

Max Speed: 2000 RPM 

Rated Voltage: 200 V 

Servomotor provided by Robert Ruber


Parts & Equipment (cont’d) 

F7 Motor Drive Unit 

– Model: Yaskawa CIMR-F7U41P5 

CIMR F7U41P5 

Rated Input Voltage: 480 V 

Rated Output Current: 3.7 A



Position Sensor 

A position sensor will be 

purchased and used to 

measure the displacement 

of the train due to levitation



Digital Force Gauge 

A force sensor will be used 

to measure the levitation 

force felt by the train


Specifications for New Maglev System


Issues to Address 

Adverse effect of steel rivets on bicycle wheel to 

the attraction of the Halbach array of magnets. 

Material selection for gap creation between steel 

rivets and inductrack. inductrack 

Wheel rotation with load must exceed ~700 rpm 

Stability of support structure to withstand fast 

rotational speeds of the wheel with little vibration 

Proper sensor placement on the Maglev system


Fall Semester Schedule 

Weeks 1-2 1 

Development of functional description 

deliverable. Research on previous 

Maglev work along with personal 

verification measurements. 

Weeks 3-5 3 

Development of specifications 

deliverable. Parts research for motors, 

position sensors, and force sensors. 

Development ideas for new Maglev 

system. 

Weeks 6-7 6 

Preparation for project proposal and 

oral presentation. Collaboration with 

mechanical technician for support 

structure rebuild.


Spring Semester Tentative Schedule 

Weeks 1-2 1 

Collaboration with mechanical 

technician for support 

structure rebuild. 

Weeks 3-5 3 

Complete Maglev system 

construction. 

Weeks 6-10 6 10 Train levitation. Experimental 

tests and measurements. 

Weeks 11-14 11 14 Development of feedback 

signals to create a closed-loop 

closed loop 

system. Preparation for oral 

presentation and final project 

report.


References 

[1] Paul Friend’s Senior Project Magnetic Levitation Technology 1 Final Report, 

12 May, 2004. 

[2] Paul Friend’s Senior Project Proposal, 12 December, 2003. 

[3] Paul Friend’s Project Proposal Presentation, 9 December, 2003. 2003. 

[4] Dusty Funk & Kyle Getsla’s Senior Project Magnetic Levitation Train 

Final Report, 2005. 

[5] Halbach, Halbach, 

K., “Applications of permanent magnets in accelerators and electron electron 

storage rings,” Journal of Applied Physics, Physics, 

vol. 57, p. 3605, 1985. 

[6] Post, Richard F., Ryutov, Ryutov, 

Dmitri D., “The Inductrack Approach to 

Magnetic Levitation,” Lawrence Livermore National Laboratory. 

[7] Yaskawa Electric Corporation. “User’s Manual,” Servo Selection and Data 

Sheets, Sheets, 

October, 2000.


Patents 

Richard F. Post 

Magnetic Levitation System for Moving Objects 

U.S. Patent 5,722,326 

March 3, 1998 


Inductrack Magnet Configuration 

U.S. Patent 6,633,217 B2 

October 14, 2003 


Inductrack Configuration 

U.S. Patent 629,503 B2 



Laminated Track Design for Inductrack Maglev System 

U.S. Patent Pending US 2003/0112105 A1 

June 19, 2003 

Coffey; Howard T. 

Propulsion and stabilization for magnetically levitated vehicles 

U.S. Patent 5,222,436 

June 29, 2003 

Coffey; Howard T. 

Magnetic Levitation configuration incorperating 

levitation, guidance and linear synchronous motor 

U.S. Patent 5,253,592 


Levi;Enrico; Zabar;Zivan; 

Air cored, linear induction motor for magnetically levitated 

systems 

U.S. Patent 5,270,593 

November 10, 1992 

Lamb; Karl J. ; Merrill; Toby ; Gossage; Scott D. ; Sparks; 

Michael T. ;Barrett; Michael S. 

U.S. Patent 6,510,799 

January 28, 2003

Questions? 

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