LINEAR SWITCHED RELUCTANCE MOTOR

FOR

RAILWAY PROPULSION SYSTEM

Under the guidance of :

Dr. Shailendra Jain

Professor

Presented by :

D.Ravikumar

1421132171

Contents

Requirements of High Speed Transit System

Need of Linear Motors

Suitability of Linear SRM for Railway System

Advantages of LSRM Over Induction Motor

Switched Reluctance Motors

Classification of SRM

Construction and Working Principle of Switched Reluctance Motor

Linear SRM Drive Structure

Literature Review

Proposed Work With Timeline

Conclusion

2

3

Requirements of High Speed Transit System

More Efficient Use of Time

Reduced Congestion

Enormous energy savings

4

Reduced Dependence on Foreign OilReduced Dependence on Foreign Oil

Safer than Driving

No Noise

Reduces Air pollution

Need of Linear Motors

Linear Motors adapt to both people movers and industrial transport uses

Tubular LIMs for short travel (less than 1 m) can be built for robotic applications

Industrial applications such as food processing, laser cutting machines, PCB assembly….

Short stroke linear oscillatory motors are in commercial use as gas-compressor drives, or IC

engine-driven linear generators

5

Suitability of LSRM for Railway System

High starting torque

Simple construction make it an attractive alternate to AC and DC motors

High performance even in harsh environment

Power density is high

High acceleration

It requires only unidirectional current for its four-quadrant operation so number of power switches can be reduced

6

Advantages of LSRM over Induction Motor

High starting torque

Windings are on the stator only

Lowest moment of inertia

Low heat loss

No cogging and crawling

Electrical fault in one phase does not affect other phases

7

Torque ripple is high

More acoustic noise

Rotor position is required to control the SRM

Disadvantages

Comparative Analysis of Induction Motor

and SR Motor

S NO Characteristic SR Motor Induction Motor

1 Efficiency

2 Speed range

3 Torque density

4 Over load capability

5 Potential for improvement

8

5 stars indicates the best suitability where as 1 star shows the poor response.

Classification of SRM

9

Switched Reluctance Motor

Construction

Three phase 6\4 pole SRM

10

Physical structure of SRM

Working Principle

Cycle Phase

A

Phase

B

Phase

C

Position

1 ON OFF OFF 0

OFF ON OFF 30

OFF OFF ON 60

2 ON OFF OFF 90

OFF ON OFF 120

OFF OFF ON 150

3 ON OFF OFF 180

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30° 60°0°

Structure of SRM Drive System

Switched

Reluctance Motor

Position sensor

Control circuit

DC

Supply

Electronic Commutator

12

Inductance vs Rotor Position

13

Where β𝑠and 𝛽𝑟are the stator and rotor pole arcs

and 𝑃𝑟 is the number of rotor poles.

𝜃1 =1

2

2𝜋

𝑃𝑟− β𝑠 + 𝛽𝑟

𝜃2 = 𝜃1 + β𝑠

𝜃3 = 𝜃2 + 𝛽𝑟 − 𝛽𝑠

𝜃4 = 𝜃3 + 𝛽𝑠

𝜃5 = 𝜃4 + 𝜃1 =2𝜋

𝑃𝑟

Power Converter of SRM

14

Asymmetric bridge

converter :

This type of the SR

drive can support independent

control of each phase.

It has three modes

1. Magnetization mode

2. Freewheeling mode

3. Demagnetization mode

Vdc

3 Phase Asymmetric Bridge Converter

Modes of Operation

15

Magnetization DemagnetizationFreewheeling

B

AA A

B

B1 1

2

1

2 2

Waveforms with Different Switching Strategies

16

Torque-Speed Characteristics

17

Linear SRM

Side view Front view

Translator

Stator

Direction of motionDirection of motion

18

Structure of Linear SRM

19

Linear SRM with load cell

Linear SRM

Linear SRM Drive Structure

20

Literature Review

PAPER- Switched Reluctance Drives For Electric Vehicle Applications [9]

It explains the suitability of switched reluctance drive in electric vehicle

applications

It gives the guidelines for designing of switched reluctance motor

PAPER- Electric Propulsion System (EPS) for Electric Vehicular Technology (EVT) [5]

Comparative analysis of different Electric Motors used in EPS

Electric motors used in different Electrified Vehicles

21

PAPER- Power Ratings and Losses Estimation Of A SRM For Electrified Railway Applications [7]

Different power losses of the motor with the train speed are explained

The continuous output power of the SRM is determined for electrified

railway

PAPER- Linear Switched Reluctance Motor as a High Efficiency Propulsion System for Railway Vehicles [4]

It presents a study on model-based developing of linear and rotational

SRM using FEM tool

The characteristics of the linear and of the rotational motor are almost

identical

22

Proposed Work with Timeline

S.NO PROPOSED WORK TIME PERIOD

1 Understanding the construction and working of SRM and Linear SRM AUG-SEP

2 Modeling of 6/4 pole SRM and Linear SRM OCT-DEC

3 Exploring the use of Ansys software for Modified control of LSRM for

TRACTION application

JAN-FEB

4 Simulation Work, Analyzing and Comparing the Results MAR-APR

5 Final Presentation and Thesis Submission MAY-JUN

23

Conclusion

Linear SRM offer simple and robust design

Suitable for highly reliable applications

High starting torque

It has great potential in motion control applications

High performance even in harsh environment

Power density is high

Therefore the linear SR motor can be supposed as a good candidate for use in an

autonomous RAILWAY SYSTEM.

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References

1. T. J. E. Miller, Switched Reluctance Motors and Their Control, Magna Physics Publishing

and Clarendon press, Oxford, 1993

2. R. Krishnan, Switched Reluctance Motor Drives: Modelling, Simulation, Analysis, Design,

and Applications, CRC Press, 2001

3. Linear Electric Machines, Drives, and MAGLEVs Handbook by ION BOLDEA

4. Linear Switched Reluctance Motor as a High Efficiency Propulsion System for Railway

Vehicles by L. Kolomeitsev, D. Kraynov, S. Pakhomin, F. Rednov, E. Kallenbach, V. Kireev, T.

Schneider, J. Böcker

5. Electric Propulsion System for Electric Vehicular Technology : A review Lalit Kumar,

Shailendra Jain Department of Electrical Engineering, Maulana Azad National Institute of

Technology(MANIT),Bhopal,MP,India

6. M Santosh Kumar, Dr. Manisha Dubey and Alekh Ranjan, “Permanent Magnet Linear

Generator Design for Wave Power”, International Conference on Computing,

Communication and Electrical Technologies ICCCT pp.542-547 4th and 5th April 2014. 25

References

7. POWER RATINGS AND LOSSES ESTIMATION OF A SWITCHED RELUCTANCE MOTOR FOR ELECTRIFIED RAILWAY APPLICATIONS BY Mohammad B. B. Sharifian1 Farhad Shahnia2

8. DESIGN AND CONTROL OF A ROPELESS ELEVATOR WITH LINEAR SWITCHED RELUCTANCE MOTOR DRIVE ACTUATION SYSTEMS By Hong Sun Lim

9. Switched reluctance drives for electric vehicle applications P.Andrada, M.Torrent, B.Blanqué, J.I.Perat

10. Henke, M.; Grotstollen, H.: Modeling and Control of a Longstator-Linearmotor for a Mechatronic Railway Carriage. Proc. of the 1st IFAC Symp. on Mechatronic Systems. Sept. 2000, Darmstadt, Germany, pp. 353-357.

11. Lloyd, J., SR drive applications, in Tutorial Course on Switched Reluctance Motor Drives, organized by R. Krishnan, Conf. Rec. IEEE Ind. Appl. Soc. Ann. Mtg.,Oct.,210–245, 1996.

12. Krishnan, R. and A.S. Bharadwaj, A comparative study of various motor drive systems for aircraft applications, Conf. Rec. IEEE Ind. Appl. Soc. Ann. Mtg.,Oct., 252–258,1991.

13. Bae, H.K., B.S. Lee, P. Vijayraghavan, and R. Krishnan, A linear switched reluctance motor: converter and control, Conf. Rec. IEEE Ind. Appl. Soc. Ann. Mtg., Oct.,547–554, 1999.

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Thank You

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