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Electromagnetic and Vibration Analysis of E-core Switched Reluctance Motor with Permanent Magnets and Auxiliary Windings

  • Saranya, S. (Department of Electrical and Electronics Engineering, SSN College of Engineering) ;
  • Balaji, M. (Department of Electrical and Electronics Engineering, SSN College of Engineering)
  • Received : 2018.04.25
  • Accepted : 2018.11.30
  • Published : 2019.03.20

Abstract

In this work a new configuration of E-core stator Switched Reluctance Motor (SRM) with permanent magnets and auxiliary windings embedded in the stator yoke is proposed. For the proposed configuration of SRM electromagnetic analysis is performed using Finite Element Analysis (FEA) based computer aided design package MagNet and to emphasize its merits a comparison is drawn with existing hybrid excitation configuration of SRM. In addition, the vibration characteristics of the motor are analyzed by performing modal and transient analysis using the ANSYS package. Results of the analysis reveals that the proposed configuration of SRM exhibits better electromagnetic and vibration characteristics and is capable of competing with the existing topologies in the variable speed market.

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Fig. 1. Structure of hybrid E-core SRM.

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Fig. 2. Flux lines of hybrid E-core SRM when phase A windings are energized. (a) Aligned position. (b) Unaligned position.

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Fig. 3. Arrow plot for flux distribution of hybrid E-core SRM at aligned position. (a) Phase A energized. (b) Phase B energized.

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Fig. 4. Static flux linkage vs current characteristics for hybrid Ecore SRM with and without PM and AW.

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Fig. 5. Inductance profile for hybrid E-core SRM with and without PM and AW.

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Fig. 6. Torque profile for hybrid E-core SRM with and without PM and AW.

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Fig. 7. Cogging torque profile for hybrid E-core SRM.

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Fig. 8. Structure of hybrid SRM.

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Fig. 9. Flux distribution of hybrid SRM at aligned position. (a) Phase A energized. (b) Phase B energized.

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Fig. 10. Structure of DSPM SRM.

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Fig. 11. Flux distribution of DSPM SRM at aligned position. (a) Phase A energized. (b) Phase B energized.

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Fig. 12. Comparison of phase flux linkage characteristics for the three different configurations of SRM.

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Fig. 13. Dynamic torque characteristics of Hybrid SRM at rated current.

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Fig. 14. Dynamic torque characteristics of DSPM SRM at rated current.

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Fig. 15. Dynamic torque characteristics of Hybrid E-core SRM at rated current.

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Fig. 16. Flow chart for vibration analysis.

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Fig. 17. Stator mode shapes of hybrid E-core SRM using 3-D FEA. (a) Mode 1(2100 Hz). (b) Mode 2 (3778 Hz). (c) Mode 3 (3878 Hz). (d) Mode 4 (6198 Hz). (e) Mode 5 (8071 Hz).

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Fig. 18. X direction displacement vs frequency due to normal and tangential forces for hybrid E-core SRM.

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Fig. 19. Y direction displacement vs frequency due to normal and tangential forces for hybrid E-core SRM.

TABLE I COMPARISON OF AVERAGE TORQUE

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TABLE II STRUCTURAL PARAMETERS FOR THREE DIFFERENT CONFIGURATIONS OF SRM

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TABLE III COMPARISON OF STATIC AVERAGE TORQUES FOR DIFFERENT CURRENT LEVELS

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TABLE IV COMPARISON OF PERFORMANCE PARAMETERS

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TABLE V NATURAL FREQUENCIES FOR THREE DIFFERENT CONFIGURATIONS OF SRM

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TABLE VI COMPARISON OF DISPLACEMENT VALUES

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Acknowledgement

Supported by : Department of Science and Technology

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