Comparative study of torque ripple minimization techniques for a three-phase switched reluctance motor de Paula, M. V., Barros, T. A. S., Santos Neto, P. J. , de Souza, R. R., and Ruppert Filho, E. 2018/04/20

Abstract

Switched reluctance machines (SRM) raise advantages such as ruggedness, simplicity and fault tolerance, which highlights these machines among other topologies for variable speed applications. However, inherent drawbacks as high torque ripple and acoustic noise occur, both caused by the doubly salient structure and drive principle. This paper presents an investigation regarding SRMs torque ripple mitigation. The principles of SRM are addressed to explain the torque ripple presence. Then, instantaneous torque control (ITC) techniques, such as common torque sharing functions (TSF), direct instantaneous torque control (DITC) and direct torque control (DTC) are discussed and compared. Simulations are performed to verify the control algorithms. The simulated system consists of a control block containing the control algorithm of one aforementioned technique, an asymmetric half bridge (AHB), an 80 V power supply, and an 1,5 kW, 12/8 SRM. Simulations convey that, among the TSFs, the sinusoidal TSF arise lower torque ripple. After that, the sinusoidal TSF was compared to the other methods, in this case, sinusoidal TSF produced minor torque ripple from 0 to 1000 rpm and for higher speeds, DITC presented smaller torque ripple. It is possible to conclude that TSF is recommended for low speed applications, while DITC is suggested for higher speed applications.

Authors and affiliations

de Paula, M. V.1, Barros, T. A. S.1, Santos Neto, P. J. 1, de Souza, R. R. 1, and Ruppert Filho, E. 1
1 Faculty of Electrical and Computer Engineering, University of Campinas. Campus of Campinas – Campinas (Brazil)

Key words

Switched Reluctance Motor, Torque Ripple Reduction, Direct Torque Control, Direct Instantaneous Torque Control, Torque Sharing Function, Instantaneous Torque Control.

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