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2D Finite Element Electromagnetic Field Calculation of

LINEAR SWITCHED RELUCTANCE MOTOR

Under the guidance of :

Dr. Shailendra JainProfessor

Presented by :

D.Ravikumar142113217

MAULANA AZAD NATIONAL INSTITUTE OF TECHNOLOGY Bhopal, Madhya Pradesh

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Contents Classifications of LSRM Importance of Finite Element Analysis 2D Finite Element Electromagnetic Field Calculation

Models of Double Sided Longitudinal flat LSRM Design specifications Flux lines distribution Magnetic flux density distribution

Results Conclusion

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Classification of LSRM

LSRM

Flat LSRMs

Longitudinal

Lamination

Transverse Laminatio

nTubular LSRM

Flat LSRMs (Longitudinal)

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Side view Front view

Translator

Stator

Direction of motion

Direction of motion

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1. Longitudinal 8/6 Single Sided LSRM

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Flat LSRMs (Transverse)

Laminated segmented secondary

Non conducting, non magnetic primary frame

Non conducting, non magnetic secondary frame

Motion

2. Transverse 8/6 Single Sided LSRM

Side view Front view

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Tubular LSRM

Air gap

Yoke laminations

Tooth lamination

s

Tubular mover

primary

Iron eddy current barriers and ventilation channels

Tubular LSRM

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Importance of Finite Element Analysis

In order to generate a high-propulsion force, the LSRM must be operated in the saturation zone.

In saturation conditions, the flux linkage and the propulsion force are highly nonlinear

Consequently, the analytical methods based on some hypotheses are not very accurate to compute the electromagnetic characteristics

To overcoming the limitations of analytical methods, numerical methods, such as finite element analysis (FEA), are preferred.

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2D Finite Element Electromagnetic Field CalculationModels of Double sided Longitudinal LSRM

Aligned position Unaligned position

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Design Specifications [1]:

Upper & Lower rail – 8 poles each [M-22 STEEL]

4 phase windings on Upper & Lower rails

No of turns/phase – 2000 [10 AWG]

Excitation – 4 Amp/ phase

Stator tooth width – 1 cm

Stator slot width – 1 cm

Stator slot depth – 5 cm

Translator – 6 poles [M-22 STEEL]

Translator tooth width – 1 cm

Translator slot width – 2 cm

Air gap – 2 mm

Translator slot depth – 4 cm

No of air ducts on each stator rail - 3

No of air ducts on translator – 2

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Mesh analysis with 51174 Nodes

Mesh analysis with 49137 Nodes

Aligned position Unaligned position

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Flux lines distributionAligned position Unaligned

position

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Magnetic flux density distribution

Aligned position

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Magnetic flux density distribution

Unaligned position

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Flux density along Translator

Aligned position Unaligned position

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Flux density along Stator slots

Aligned position Unaligned position

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Field intensity along Translator

Aligned position Unaligned position

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Field intensity along Stator slots

Aligned position Unaligned position

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Circuit Properties

Aligned position Unaligned position

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Conclusion

LSRM with longitudinal flux linkage is analyzed using 2D-FEM The magnetic behavior of this actuator is nonlinear due to

the saturation and nonlinear magnetization curves of the materials used in this actuator.

For this reason, the electromagnetic quantities such as flux linkage, flux density and field intensity are calculated with the finite element method using the FEMM tool.

The obtained results are presented

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References 1. Eng, T. J. E. (2014). Design of a double-stator linear switched reluctance

motor for shunting railway channels. Turkish Journal of Electrical Engineering & Computer Sciences, 22, 302-314.

2. Amoros, J. G., Molina, B. B., & Gascon, P. A. (2011, August). Simulation of linear switched reluctance motor drives. In Proceedings of the 2011 14th European Conference on Power Electronics and Applications.

3. Chen, H., & Wang, Q. (2013). Modeling of switched reluctance linear launcher. Plasma Science, IEEE Transactions on, 41(5), 1123-1130.

4. Darabi, S., & Ardebili, M. (2011, February). Analysis of linear switched reluctance motor with longitudinal flux linkage using 2D-FEM compared to 3D-FEM. In 2011 2nd Power Electronics, Drive Systems and Technologies Conference.

5. Lenin, N. C., & Arumugam, R. (2010). Analysis and experimental verification of a linear switched reluctance motor having special pole shape. Majlesi Journal of Electrical Engineering, 4(2), 1-7.

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References6. García-Amorós, J., Andrada, P., & Blanqué, B. (2015). Assessment of Linear Switched

Reluctance Motor's Design Parameters for Optimal Performance. Electric Power Components and Systems, 43(7), 810-819.

7. T. J. E. Miller, Switched Reluctance Motors and Their Control, Magna Physics Publishing and Clarendon press, Oxford, 1993

8. R. Krishnan, Switched Reluctance Motor Drives: Modelling, Simulation, Analysis, Design, and Applications, CRC Press, 2001

9. Linear Electric Machines, Drives, and MAGLEVs Handbook by ION BOLDEA10. Deshpande, U. (2000). Two-dimensional finite-element analysis of a high-

force-density linear switched reluctance machine including three-dimensional effects. Industry Applications, IEEE Transactions on, 36(4), 1047-1052.

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Thank You