SVM–DTC Permanent Magnet Synchronous Motor Driven Electric Vehicle with Bidirectional Converter


Electric Vehicle (EV) technology provides an effective solution for achieving better performance compared to conventional vehicles. This paper highlights the use of a bidirectional buck-boost converter for a Permanent Magnet Synchronous Motor (PMSM) driven EV. The bidirectional buck–boost converter interfaces the low-voltage battery with a high-voltage dc bus and maintains a bidirectional power flow. The batteries are at low voltage to obtain higher volumetric efficiencies, and the dc link is at higher voltage to have higher efficiency on the motor side. PMSMs are known as a good candidate for EV due to their superior properties such as high torque/volume ratio, power factor and high efficiency. This paper also includes Space Vector Modulation (SVM) based Direct Torque Control (DTC) which controls the PMSM to reduce the ripples in both torque and speed. A closed loop control system with a Proportional Integral (PI) controller in the speed loop has been designed to operate in constant torque and flux weakening regions. Extensive simulation work was carried out using Matlab/ Simulink, and the results established shows that the performance of the controller both in transient as well as in steady state is quite satisfactory.


  1. Permanent Magnet Synchronous Motor (PMSM)
  2. Electric vehicle
  3. Simulation
  4. SVM
  5. DTC bidirectional converter



Fig. 1: Schematic diagram of the proposed system


Fig. 2: Response of reference torque and generated torque

Fig. 3: Response of reference Speed and generated Speed

Fig. 4: Stator Flux

Fig. 5: Stator Flux Trajectory

Fig. 6: Velocity of traction system

Fig. 7: Response of dc link voltage

Fig. 8: Phase Current of PMSM


The present paper has presented a bidirectional buck boost converter for a PMSM drive controlled by SVM based DTC. This controller determinates the desired amplitude of torque hysteresis band. It is shown that the proposed scheme results in improved stator flux and torque responses under steady state condition. The main advantage is the improvement of torque and flux ripple characteristics at any speed region; this provides an opportunity for motor operation under minimum switching loss and noise. So this produces the required torque with minimum torque ripples. A speed controller has been designed successfully for closed loop operation of the PMSM drive system so that the motor runs at the commanded or reference speed. The simulated system has a fast response with zero steady state error thus validating the design method of the speed controller.


[1] D. Sandalow, Ending Oil Dependence. Washington, D.C.: The Brookings Institution, Jan. 2007

[2] A. Emadi, Y. J. Lee, and K. Rajashekara, “Power electronics and motor drives in electric, hybrid electric, and plug-in hybrid electric vehicles,” IEEE Trans. Ind. Electron., vol. 55, no. 6, pp. 2237–2245, Jun. 2008.

[3] F. Caricchi, F. Crescimbini, G. Noia, and D. Pirolo, “Experimental study of a bidirectional DC–DC converter for the DC link voltage control and the regenerative braking in PM motor drives devoted to electrical vehicles,” in Proc. IEEE APEC, Orlando, FL, Feb. 1994, vol. 1, pp. 381–386

[4] Enrique L. Carrillo Arroyo, “Modeling and simulation of permanent magnet synchronous motor drive system,” M.S Thesis 2006.

[5] J. Rais, M. P. Donsión, “Permanent Magnet Synchronous Motors (PMSM). Parameters influence on the synchronization process of a PMSM,” Articel

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