Here stabilization of Maglev system using two systems are studied by performing various simulations ref:IEEE,Stabilization of a Permanent-Magnet MAGLEV System via Null-Flux Coils Antonino Musolino, Marco Raugi, Rocco Rizzo, and Ernesto Tripodi

1. STABILIZATION OF A
PERMANENT-MAGNET MAGLEV
SYSTEM
Presented By:-
Blesson Binoy Abraham
S7,EEE R#15
AJCE

2. CONTENTS
INTRODUCTION
OBJECTIVE
LITERATURE REVIEW
DESCRIPTION OF THE SEMINAR
RESULTS
CONCLUSION
BIBLIOGRAPHY
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3. INTRODUCTION
A passive permanent-magnet (PM)based magnetic levitation
system is presented and its stability is discussed
Two versions of the device are discussed
 In the first, the stabilizing currents
are induced on a conductive
sheet surrounding the guideway.
 In the second system, the
stabilizing currents flow in an
array of null-flux coils.
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4. OBJECTIVE
To study briefly about magnetic levitation and MAGLEV
devices.
Compare and study the performance of the two proposed
systems.
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5. MAGNETIC LEVITATION
Magnetic levitation: Method by which an object is suspended
with no support other than magnetic fields.
MAGLEV systems :speeds greater than 150 m/s (540
km/h)[1].
The suspension is assured by the repulsive force provided
properly shaped PMs placed on both the guideway and the
vehicle[1].
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6.  Maglev trains have to perform the following functions to
operate in high speeds
BASIC PRINCIPLE OF MAGLEV TRAINS
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Fig 1.Levitation Fig 2.Propulsion Fig 3.Lateral Guidance
Fig 4.

7. PROPOSED SYSTEMS
The two proposed configurations share the same
arrangement of PMs on both the guideway and the armature,
but differ for the arrangement of the conductors on the
guideway.
The PMs on the armature are arranged to form a Halbach
array in the azimuth direction to focalize the flux density in
the region faced to the guideway.
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8. LEVITATION SYSTEM WITH THE
CONDUCTIVE SHEET.
The first configuration is based on the addition of a cylindrical
conductive sheet that surrounds the PM on the guideways, as
shown in figure.
 Consider a single PM moving at constant
speed above a conducting plate; it
will experience magnetic lift and
drag forces from the motional-induced
eddy currents in the plate. As a
consequence, the PM would be
pushed away and slowed.
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Fig 5

9. Consider the armature moving in the z-axis; because of the
relative motion between PMs and the conductive sheet, eddy
currents are induced on the sheet.
 These currents interact with the PMs of the armature resulting in
a Lorentz force, which has drag and lift components with the
effect of reducing the cause produced by the eddy currents
themselves
This means that there is not only a velocity reduction (due to the
magnetic drag force) but also an increase in lift force between the
Permanent Magnets and the conductive sheet.
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10. SIMULATION STUDY
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Fig 6. Eddy-current distribution in Conductive sheet at t =6.1ms

11. SIMULATION STUDY
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Fig. 7. Forces on the armature in the symmetric configuration
Fy
Fz

12. SIMULATION STUDY
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Fig. 8. Eddy-current distribution at t =1.5ms,x = 1.48mm

13. SIMULATION STUDY
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Fig. 9. Eddy-current distribution at t =9.6ms, x = -0.75mm

14. LEVITATION SYSTEM WITH THE
NULL-FLUX COILS.
The operation of the device is easily explained by
considering the system shown in Fig.11 where two identical
radial magnetized PMs move at a given speed located at the
same distance from two halves of a null-flux coil.
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Fig.10
Fig.11

15. In this symmetric configuration, the resulting flux linked
with the coil is zero and no currents are induced.
If the PMs are shifted onto the x-direction, the flux linked
with the right part of the null-flux coil is greater than the flux
linked with the left one.
 As the PMs move, the resultant flux varies and as a
consequence, a current is induced in the null-flux coil, which
interacts with the PMs.
The force on both the PMs is repulsive, and is greater on the
right-hand side, so the resultant force on the PMs produced
by the null-flux coils has a stabilizing effect.
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16. UNROLLED NULL-FLUX COIL
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Fig. 12. Unrolled null-flux coil.

17. SIMULATION STUDY
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Fig. 13. Currents in the null-flux coils at t =0.7 ms.

18. SIMULATION STUDY
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Fig. 15. Resultant force on the armature when it is initially shifted.

19. SIMULATION STUDY
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Fig. 14. Currents in the null-flux coils at t =8.6 ms.

20. SIMULATION STUDY
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Fig. 16. Resultant force on the armature when a lateral force is
applied.

21. CONCLUSION
A brief study on magnetic levitation and MAGLEV devices
has been done.
Compared and studied about the effectiveness of the two
proposed systems.
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22. BIBLIOGRAPHY
[1] H.-W. Lee, K.-C. Kim, and J. Lee, “Review of Maglev train
technologies,” IEEE Trans. Magn., vol. 42, no. 7, pp. 1917–1925, Jul.
2006.
 [2] M. Ono, S. Koga, and H. Ohtsuki, “Japan’s superconducting
Maglev train,” IEEE Trans. Instrum. Meas. Mag., vol. 5, no. 1, pp. 9–
15, Mar. 2002.
[3] M. Tsuchiya and H. Ohsaki, “Characteristics of electromagnetic
force of EMS-type Maglev vehicle using bulk superconductors,”
IEEE Trans. Magn., vol. 36, no. 5, pp. 3683–3685, Sep. 2000.
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23. THANK YOU
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