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BRADLEY UNIVERSITY

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Magnetic Levitation System for Moving Objects. U.S. Patent 5,722,326. March 3, 1998 ... T. Magnetic Levitation configuration incorperating levitation, guidance and ... – PowerPoint PPT presentation

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Title: BRADLEY UNIVERSITY


1
BRADLEY UNIVERSITY Department of Electrical and
Computer Engineering Sr. Capstone
Project Advisor Dr. Anakwa Student Paul Friend
2
  • Overview
  • Background Information
  • Halbach Array
  • Inductrack
  • Sensors
  • Propulsion Methods
  • Controls
  • Physical Design
  • Theories
  • Parts and Equipment
  • Schedule
  • Resources

3
  • Background Information
  • Inductrack
  • Created by Richard F. Post in the late 1990s at
    Lawrence Livermore National Laboratory
  • 20 meter test track
  • Burst Propulsion

4
  • Background Information
  • Inductrack
  • Contracted by NASA for Satellite Launcher
  • Low-Speed Urban Maglev Program

5
  • Halbach Array
  • Created by Klaus Halbach
  • Creates a strong, nearly one-sided magnet with a
    sinusoidal field by directing the magnetic
    fields.

6
  • Halbach Array
  • Standard Formation
  • Expanded Wavlength
  • Doubled Method

7
Halbach Array B0 Br (1 e-2pd/?)(sin(p/M))/
( p/M) Tesla B0 0.82843 (1/2 Gr. 38 NdFeB
Cube Magnets) Bx B0 sin((2p/?)x) e-(2p/?) (y1
y) Tesla By B0 cos((2p/?)x) e-(2p/?) (y1
y) Tesla
8
  • Inductrack
  • Basic Methods
  • Array of Inductors
  • Laminated Copper
  • Laminated Aluminum

9
  • Inductrack
  • Array of Inductors
  • Used in 1st Inductrack
  • Insulated Litz-wire
  • Ferrite Loading

10
  • Inductrack
  • Laminated Copper
  • Square Litz-wire bulks
  • Used for Low-Speed Urban Maglev Program

11
  • Inductrack
  • Laminated Copper Aluminum
  • Thin Sheets
  • Slots cut to guide eddy currents
  • Slots terminated at ends for shorts

12
  • Inductrack
  • Physics
  • Lenzs Law
  • Discovered in 1834
  • Eddy currents created due to moving magnetic
    field
  • (Not guided)

13
Inductrack Physics Circuit Equation V L dI/dT
RI ?f0 cos(?t) V Lift/Drag
Ratio Lift/Drag ltFygt/ltFxgt ?L/R (2pv/?)
(L/R) Power Efficiency K ltFygt/ltFxgt (2p/?)
(L/R) Newtons/Watt
14
Inductrack Physics ? optimum 4p y1 m Magnet
thickness of ?/5 Only valid for max. load for
min magnet weight and for original
Inductrack 501 levitated weight/magnet weight
ratio
15
Inductrack Inductrack II
16
  • Sensors
  • Types
  • Velocity Sensor
  • Optical Sensor
  • Magnetic Sensor

17
  • Propulsion
  • Types
  • Linear Synchronous Motor (LSM)
  • Linear Induction Motor (LIM)

18
  • Propulsion
  • Linear Synchronous Motor (LSM)
  • Used for Low-Speed Urban Maglev Program
  • Allows for large air gap 25 mm
  • Varied 3-phase frequency and current for contols
  • Solid copper cables and laminated iron rails
  • Works with Halbach array

19
  • Propulsion
  • Linear Induction Motor (LIM)
  • Typically electromagnets in train
  • Aluminum ladder as track
  • Levitation and propulsion aquired

20
  • Propulsion
  • Modified Linear Induction Motor (LIM)
  • Synchronized electromagnets
  • Precision sensing required
  • Controled via the current
  • PWM
  • Current Level

21
  • Controls
  • Properties to Control
  • (80515 Microcontroller Based)
  • Levitation Hieght
  • Direction
  • Velocity

22
  • Controls
  • Levitation Height Control
  • Theory of current Low-Speed Urban Maglev Program
  • Height by causing a phase shift
  • Compromises the structure

23
  • Controls
  • Direction and Velocity Control
  • Modified Induction Motor (LIM)
  • Sensing and Electromagnets

24
  • Controls
  • Direction and Velocity Control
  • Inputs
  • Mode of Operation
  • Velocity or Current
  • Outputs
  • Train Levitation
  • Train Propulsion
  • LCD Display

25
Controls Direction and Velocity Control Modes of
Operation 0.) Open Loop Backwards Current
Input1.) Closed Loop Backwards Velocity Input
with Control2.) Backwards Coast with No
Propulsion3.) Stop4.) Forwards Coast with No
Propulsion5.) Closed Loop Forwards Velocity
Input with Control6.) Open Loop Forwards Current
Input
26
Controls Free Running Position Detector Inputs
Current Direction Addressed
Sensor Outputs Addresses Senosr
Addresses Electromagnets Velocity
27
Controls Open Loop Modes 0 6 Inputs
Current Level Direction Outputs
Current
28
Controls Closed Loop Modes 1 5 Inputs
Velocity Direction
29
  • Controls
  • Coast Modes 2 4
  • Direction is indicated for sensor prediction
  • Utilizes free running position detector with no
    current
  • Velocity still displayed
  • Stop Mode 3
  • Pulse electromagnets in front of train
  • Position detector can not be used
  • Details have not been worked out

30
  • Controls
  • High Power DC Switching Current Control
  • Power MOSFET
  • Insulated -gate bipolar transistor (IGBT)
  • Gate-turn-off thyristor (GTO)

31
Controls Current Converted Converts current
levels 0 - 256 (0-FF hex) to increasing current
levels using PWM and resistor paths
32
Controls Magnet Addresser Directs current to each
individual electromagnet using an array of
switches for each section, and corresponding
placement in each section.
33
Physical Design Materials Wood and 1/16 Aluminum
34
  • Testing
  • Inductrack Testing
  • Use of a horizontal or lateral wheel
  • Utilized by Post

35
  • Theories
  • Disk Method
  • Wheel Method
  • Tractor Tread Method
  • Paddle Wheel Method

36
Standards Table of standards used by the
Low-Speed Urban Maglev Program Will be used
for concepts to keep in mind
37
Patents Richard F. Post Magnetic Levitation
System for Moving Objects U.S. Patent
5,722,326 March 3, 1998 Richard F.
Post Inductrack Magnet Configuration U.S. Patent
6,633,217 B2 October 14, 2003 Richard F.
Post Inductrack Configuration U.S. Patent 629,503
B2 October 7, 2003 Richard F. Post 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 October 19, 1993 LeviEnrico
ZabarZivan 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
38
Schedule Tentative schedule Weeks 1
4 Development and testing of tracks Weeks 5
8 Development of a propulsion method Weeks 9
10 Integration of the propulsion and the
Inductrack Weeks 11 13 Propulsion
Controls Week 14 Finish Loose Ends Based on
progress, meetings with Dr. Anakwa will determine
the direction the project will take after each
step
39
Parts and Equipment 40 - 1/2 NdFeB, Grade 38
Cubes 90.00 40 - 1/4 NdFeB, Grade 38
Cubes 14.40 Litz-wire Bulks, Copper Sheets,
Aluminum Sheets, Wheels, Conductive balls, and
Electromangets Cart/Train non inductive materials
and CNC router machine time provided by
Midwestern Wood Products Co.
40
  • Resources
  • Many Documents by Richard F. Post (LLNL)
  • General Conversation with Richard F. Post (LLNL)
  • General Conversation with Phil Jeter (General
    Atomics)
  • General Conversation with Hal Marker (Litz-wire)
  • General Converastion with Dr. Irwin (Bradley
    University)
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