Abstract
Switched reluctance motors (SRMs) have been receiving great attention in electric vehicle (EV) applications. However, the complicated control and inherent torque ripples are the major drawbacks of SRMs. This paper introduces a numerical estimation method for the optimum control parameters of SRM based on a simplified average torque control (ATC) strategy for EVs. The proposed control aims to simplify the control algorithm to cut down complexity and cost. Besides, it aims to achieve all the vehicle requirements. A multi-objective optimization problem is set to determine the most efficient excitation parameters that can fulfill the vehicle requirements. The objective function has two terms: torque ripple and efficiency. Proper constraints for both turn-on and turn-off angles are included in order to achieve high-performance control, maximum torque per Ampere (MTPA) production, and reliable operation. Besides, additional toque constraints are involved to ensure fast dynamics, high-performance torque tracking capability, and parameter insensitivity. The motor model is accurately achieved based on the experimentally measured torque and flux characteristics. Several simulations are executed to prove the feasibility and effectiveness of the proposed control. Moreover, experimental results are obtained to validate the theoretical findings. It is observed that the proposed control has a significant reduction of torque ripples compared to the conventional control methods. The average reduction ratio of torque ripple over the speed range is about 72.43%. Besides, the proposed control succeeds in maintaining a very good efficiency and high torque/current ratio. It also has a fast-dynamic performance.
Highlights
Thanks to their advantages in terms of structure, cost, reliability, efficiency, and fault-tolerance, switched reluctance motors (SRMs) have been receiving great attention in numerous industrialMathematics 2020, 8, 1213; doi:10.3390/math8081213 www.mdpi.com/journal/mathematicsMathematics 2020, 8, 1213 applications, including electric vehicles (EVs) [1,2,3,4]
The proposed simplified average torque control (SATC) strategy, along with the optimum solution for the introduced optimization problem is compared to the analytical solution of [18] under steady-state conditions
The obtained solution for the switching angles in Figure 7 is used for both techniques
Summary
Thanks to their advantages in terms of structure, cost, reliability, efficiency, and fault-tolerance, switched reluctance motors (SRMs) have been receiving great attention in numerous industrialMathematics 2020, 8, 1213; doi:10.3390/math8081213 www.mdpi.com/journal/mathematicsMathematics 2020, 8, 1213 applications, including electric vehicles (EVs) [1,2,3,4]. Thanks to their advantages in terms of structure, cost, reliability, efficiency, and fault-tolerance, switched reluctance motors (SRMs) have been receiving great attention in numerous industrial. ITC has a good capability of torque ripple reduction, it is meant only for limited speed ranges with a lower torque per ampere ratio [10]. ATC possesses a simple structure, has no torque inverse models or torque sharing functions and offers higher torque/ampere ratios, as it has no current profiling for torque control. Despite the numerous advantages of ATC, it has higher torque ripples than ITC, but these ripples can be efficiently filtered by the vehicles’ inertia. ATC is an advantageous solution for EVs [10,11,12,13]
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