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DESIGN OF SWITCHED RELUCTANCE MOTOR FOR ELECTRIC VEHICLE VIJITH K Edited By Sarath S Nair www.technologyfuturae.com 1

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OUTLINE INTRODUCTION SWITCHED RELUCATNCE MOTOR PRINCIPLE OF OPERATIONS EQUIVALENT CIRCUIT DESIGN CONSIDERATIONS FINITE ELEMENT ANALYSIS DESIGN OF SRM FOR EV CONCLUSIONS REFERENCES 2www.technologyfuturae.com

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INTRODUCTION High mileage and low emission vehicle – HEV, EV Motor for EV – Cost, Weight, Efficiency Switched reluctance motors are a good choice for an electric vehicle SRM rotates due to reluctance torque, originates from change of resistance of the magnetic circuit Advances in power electronics made SRMs an attractive candidates for EV Finite element analysis 3www.technologyfuturae.com

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SWITCHED RELUCTANCE MOTOR The reluctance motor is a type of synchronous machine Torque is produced by the tendency of its moveable part to move to a position where the inductance of the excited winding is maximized The machine is a doubly salient machine The rotor is aligned whenever the diametrically opposite stator poles are excited 4www.technologyfuturae.com

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Contd… Operation of switched reluctance motor (a) Phase c aligned and (b) Phase a aligned 5www.technologyfuturae.com

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Contd… Classification of SRM 6www.technologyfuturae.com

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PRINCIPLE OF OPERATION Torque production - Principle of electromechanical energy conversion The incremental mechanical energy, ΔW m = T e Δθ T e =ΔW m /Δθ When the mmf is constant, the incremental mechanical energy is equal to the change in magnetic coenergy ΔW m = ΔW′ f 7www.technologyfuturae.com

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Contd… W′ f = (½) L(θ, i) i 2 T e =(ΔW m /Δθ) = (ΔW′ f /Δθ) = (∂W′ f / ∂θ) = ∂ L(θ, i) i 2 ∂θ 2 8www.technologyfuturae.com

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EQUIVALENT CIRCUIT The applied voltage to a phase is equal to, 9www.technologyfuturae.com

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Contd… The equivalent circuit for one phase of the SRM Mutual inductance neglected 10www.technologyfuturae.com

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Contd… q-d axis voltage equations are, V q = r s i q + ω ʎ d + p ʎ q V d = r s i d - ω ʎ q + p ʎ d Electromagnetic torque is, 11www.technologyfuturae.com

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DESIGN COSIDERATIONS Optimal design of the motor is an important way to achieve good performance price ratio In the SRM design, the requirement of the pole arc for stator and rotor is, In the general design, β r > β s 12www.technologyfuturae.com

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Contd… Here a improved stator structure is proposed 13www.technologyfuturae.com

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Contd… Example of an SRM design 14www.technologyfuturae.com

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FINITE ELEMENT ANALYSIS Design process combines design calculations and finite element analysis Finite element method - Magnetic field analysis and Heat transfer analysis ANSYS software – FEM Static torque calculation, 15www.technologyfuturae.com

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Contd… The magnetic field analysis is carried out in order to obtain the heat quantity of the coil The heat transfer between SRM and outside air is done by natural convection 16www.technologyfuturae.com

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DESIGN OF SRM FOR EV Dimension of SRM Moderating ratio Power rating of SRM and number of motor required Drive system Calculation of temperature rise 17www.technologyfuturae.com

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CONCLUSION Basic concepts of switched reluctance motor was discussed It includes principle of operation, torque and voltage equations and equivalent circuit of SRM Design considerations of SRM motor for EV was discussed Basic concepts of Finite element analysis was also discussed 18www.technologyfuturae.com

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REFERENCES [1] Kazuhiro Ohyama, Maged Naguib F. Nashed, Kenichi Aso, Hiroaki Fujii, and Hitoshi Uehara,Department of Electrical Eng., Fukuoka Institute of Technology, Fukuoka, Japan, “Design Using Finite Element Analysis of Switched Reluctance Motor for Electric Vehicle” IEEE Trans 2006 [2] M. Morimoto, N. Matsui, and Y. Takeda, "Recent Advances of Reluctance Motors", IEEETrans. IA, Vol.119, No.10, 1145-1148, 1999 [3] Li Weili, Sheng Man, Huo Fei, “Optimal design and Finite Element Analysis of Switched Reluctance Motor for Electric Vehicles”, IEEE Vehicle Power and Propulsion Conference (VPPC), September 3-5, 2008, Harbin, China [4] Lisiate Takau, Simon Round, “Design of a Switched reluctance motor for an Electric vehicle”, Department of Electrical and Computer Engineering University of Canterbury 19www.technologyfuturae.com

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Log On to www.technologyfuturae.com Technical Presentations, Research Reviews, New designs & Developments

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THANK YOU… THANK YOU… 21www.technologyfuturae.com

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