STUDENTS: TONY PEDERSON & TOBY MILLER

ADVISOR: DR. WINFRED ANAKWA

PROJECT SUMMARY

PROJECT DESCRIPTION

SYSTEM BLOCK DIAGRAMS

ORIGINAL SCHEDULE

TASKES COMPLETED TO DATE

REMAINING TASKES

REVISED SCHEDULE

BLOCK DIAGRAM TRAIN TRACK ELECTRODYNAMIC SUSPENSION HALBACH ARRAY LINEAR SYNCHRONOUS MOTOR CONTROLLER

The goal of the project is to design a model size train that will be levitated and propelled by electromagnetism. A special magnet array called a Halbach array will be utilized along with a linear synchronous motor to make this train operate.

FREQUENCY REFERENCE SIGNAL FOR SPEED CONTROL

CONTROLLER

TRACK THREE-PHASE POWER INPUT

TRAIN WITH SPEED

SENSOR

Made out of aluminum to minimize weight 4 rows of 8 magnets arranged in a Halbach

Array 2 rows for levitation 2 rows for lateral guidance and propulsion May or may not have speed sensor. This

will be determined later.

Halbach Array’s are a special arrangement that cancels the magnetic field above the magnets, but still allows a field below the magnets. The permanent magnets that will be using are made out of Neodymium Iron Boron (NdFeB)

2 wooden guide ways Wires will be wrapped around guide way to

provide the levitation circuits A G scale model railroad track will be laid

between guide ways to provide support for take off and stopping.

A linear synchronous motor will be attached to the track to provide propulsion

The magnets on the train produce eddy currents in the levitation coils when traveling over them

The method of levitation requires a certain velocity before levitation will occur

Same principle as a rotary synchrounous motor

The rotor will be the Halbach Array

The stator will be coils of wire on the sides of the guide way

The input will be a three-phase varying frequency signal at a very low frequency (2-10 hz)

WEEK 1 - BUILD THE TRAIN. WEEKS 2-4 - FINISH DESIGNING

TRACK AND BUILD IT. WEEKS 5-12 - TESTING AND

DESIGNING A CONTROLLER. WEEKS 13-14 – PREPARING FOR

FINALE PRESENTATION.

Milling and Construction of the train. This time frame also considers getting train and track supplies. This took the first four weeks of the spring semester

Instillation of the magnets into the train in the proper Halbach Arrays. Trying to make track calculations for proper wire and levitation speed. Testing of different types of coils was completed.

OPTIMUM MAGNET THICKNESS =.2*wavelength (lambda)

Optimum wavelength = 4*pi*y1 (m)

y1 = levitation height (lambda)

Br = (Tesla) remanent field of the permanent magnet

1

2

77.Mag of Wt.

lev Wt.

y

Br

LEVITATION FORCES

vkv 2

Excitation Frequency

Peak Strength of Magnetic Field M

MeBB kd

ro /

)/sin(*]1[

LEVITATION FORCES

)2(* 1

0

2max Co ykB

A

F e

dL

d

c

y

LL

L

P

w

F

F

*

max

L

Rvt *

2

LEVITATION FORCES

C

Cd kd

PL

20

turns

P

A

lR C*

LEVITATION FORCES

Levitation Height = 1.114 cm

Transition Velocity = .808 m/s

Approximately 14,200 m of wire will be needed for 24 ft of track.

$200 = 32 NdFeB Permanent Magnets

$100 = Aluminum for Train

$120 = Model Track and Wheels

$43 = Wood for Guide Rails

??= Wire Wrapping for Guide Rails

Thickness of Wire # of Turns Approx Amps

.0315 in 1 492 mA

.10189 in10 awg

1 3.8 A

.10189 in10 awg

5 9.9 A

• Finish calculations for track and determine what wire will be used. This includes the numbers of turns, thickness, width, and distance apart

•Actually wrap the track with wire (either going to be sent out or find a freshman to do it)

•Using a spring to get a accurate measurement of speed, test the train for levitation.

•Complete as much on the motor as possible so the next group can take it from here.

• WEEK 7-8 - Finish all track calculations and coil testing on track.

• WEEKS 9-11 – Complete the wrapping on the track and do levitation testing.

• WEEK 12 – Do some motor calculations from the train and track specs

• WEEKS 13-14 – Preparing for final presentation.