linear switched reluctance motor for railway propulsion system
TRANSCRIPT
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
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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
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Switched Reluctance Motor
Construction
Three phase 6\4 pole SRM
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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
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Inductance vs Rotor Position
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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
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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
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Magnetization DemagnetizationFreewheeling
B
AA A
B
B1 1
2
1
2 2
Waveforms with Different Switching Strategies
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Torque-Speed Characteristics
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Linear SRM
Side view Front view
Translator
Stator
Direction of motionDirection of motion
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Structure of Linear SRM
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Linear SRM with load cell
Linear SRM
Linear SRM Drive Structure
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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
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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
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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
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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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