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Experimental investigation of modified in-wheel switched reluctance motor with reduced torque ripple for electric vehicles

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Abstract

This research work is aimed at the modification of in-wheel switched reluctance motor (Outer rotor-type SRM) with minimized torque ripple for electric vehicles. The geometry of stator and rotor poles affects the torque. Variation in the stator and rotor pole geometry causes change in the torque profile. To reduce the torque ripple and to increase the average torque, modification in the stator and rotor pole shoes is presented in this article. The stator and rotor pole shoes with notches and projections are proposed with the objective of minimization of torque ripple and maximization of average torque. Electromagnetic analysis of conventional and modified in-wheel SRM is done with computer-aided design software MagNet 7.1.1. From the finite element analysis results, the average torque and torque ripple values are derived. Prototype of 8/6, 1000 W in-wheel SRM with the notches and projections is fabricated. Experimentation is performed on the fabricated machine to measure the magnetic flux linkage, current and speed characteristics of the proposed in-wheel SRM. The precise determination of magnetic flux characteristics is significant to check the machine design and to accurately predict the action of modified in-wheel SRM. Static modeling results of the fabricated machine were coherent with the experimental values.

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Abbreviations

N s :

Number of stator poles

N r :

Number of rotor poles

r o :

Stator inner radius

r 1 :

Stator outer radius

r 2 :

Rotor inner radius

r 3 :

Rotor outer radius

r sh :

Shaft radius

β s :

Stator pole angle

β r :

Rotor pole angle

y s :

Stator yoke thickness

yr :

Rotor yoke thickness

g :

Air gap thickness

NT:

Number of turns

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Author information

Authors and Affiliations

  1. Department of Electronics and Instrumentation Engineering, R.M.D. Engineering College, Chennai, India

    G. Nalinashini

  2. Department of Electrical and Electronics Engineering, R.M.D. Engineering College, Chennai, India

    V. Tamilselvi

Authors
  1. G. Nalinashini
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  2. V. Tamilselvi
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Corresponding author

Correspondence to G. Nalinashini.

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Appendix 1

Appendix 1

Machine details of conventional in-wheel SRM.

Design parameter

Value

Number of stator poles

8

Number of rotor poles

6

Air gap thickness g

0.4 mm

Stack length

40 mm

Bore diameter

161.7 mm

Shaft diameter

35 mm

Rotor outer diameter

229 mm

Back-iron thickness

22 mm

Turns per phase

120

Rated current

5A

Rated speed

600 rpm

Stator pole arc

19°

Rotor pole arc

20°

Specification of proposed in-wheel SRM.

Design parameter

Value

Transmission efficiency ηt

0.97

Number of stator poles

8

Number of rotor poles

6

Air gap thickness g

0.4 mm

Stack length

40 mm

Bore diameter

161.7 mm

Shaft diameter

35 mm

Rotor outer diameter

229 mm

Back-iron thickness

22 mm

Turns per phase

120

Rated current

5A

Rated speed

600 rpm

Stator pole arc

19°

Rotor pole arc

20°

Average torque (Nm)

5.107

Torque ripple (%)

0.157

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Nalinashini, G., Tamilselvi, V. Experimental investigation of modified in-wheel switched reluctance motor with reduced torque ripple for electric vehicles. Electr Eng 103, 2837–2845 (2021). https://doi.org/10.1007/s00202-021-01276-8

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  • DOI: https://doi.org/10.1007/s00202-021-01276-8

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