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 track and train propulsion system Low Speed Urban Maglev Program
Previous Work at Bradley University 2003-2004 2004 Paul Friend Initial research Equations developed GUI created in MATLAB Circular wire-rung rung inductrack attempted Tony Pederson and Toby Miller Linear wire-rung rung inductrack attempted 2005-2006 2006 Dusty Funk and Kyle Getsla New support structure created Laminated sheets inductrack attempted
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Small-Scale Scale Maglev System 1 st st goal Project Summary To demonstrate levitation 2 nd 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 loop system. To use a digital force gauge to measure the force needed to levitate the train to a desired height.
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 the wall into a control unit which will control the AC motor. The control c 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 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.
Servomotor Parts & Equipment Model: Yaskawa 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 Rated Input Voltage: 480 V Rated Output Current: 3.7 A
Parts & Equipment (cont d) Position Sensor A position sensor will be purchased and used to measure the displacement of the train due to levitation
Parts & Equipment (cont d) Digital Force Gauge A force sensor will be used to measure the levitation force felt by the train
Specifications for New Maglev System Specifications for New Maglev System PDF Created with deskpdf PDF Writer - Trial :: http://www.docudesk.com
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. 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
Weeks 1-21 Weeks 3-53 Weeks 6-76 Fall Semester Schedule Development of functional description deliverable. Research on previous Maglev work along with personal verification measurements. Development of specifications deliverable. Parts research for motors, position sensors, and force sensors. Development ideas for new Maglev system. Preparation for project proposal and oral presentation. Collaboration with mechanical technician for support structure rebuild.
Spring Semester Tentative Schedule Weeks 1-21 Weeks 3-53 Weeks 6-106 Weeks 11-14 Collaboration with mechanical technician for support structure rebuild. Complete Maglev system construction. 10 Train levitation. Experimental tests and measurements. 14 Development of feedback signals to create a closed-loop 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. 03. [4] Dusty Funk & Kyle Getsla s Senior Project Magnetic Levitation Train Final Report, 2005. [5] Halbach,, K., Applications of permanent magnets in accelerators and electron storage rings, Journal of Applied Physics,, vol. 57, p. 3605, 1985. [6] Post, Richard F., 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,, October, 2000.
Patents PDF Created with deskpdf PDF Writer - Trial :: http://www.docudesk.com 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 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
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