Advanced Torque Ripple Minimization of Synchronous Reluctance Machine for Electric Vehicle Application

Abstract

The electric machine and the control system determine the performance of the electric vehicle drivetrain. Unlike rare-earth magnet machines such as permanent magnet synchronous machines (PMSMs), synchronous reluctance machines(SynRMs) are manufactured without permanent magnets. This allows them to be used as an alternative to rare-earth magnet machines. However, one of the main drawbacks of this machine is its high torque ripple, which generates significant acoustic noise. The most typical method for reducing this torque ripple is to employ an optimized structural design or a customized control technique. The objective of this paper is the use of a control approach to minimize the torque ripple effects issue in the SynRM. This work is performed in two steps: Initially, the reference current calculation bloc is modified to reduce the torque ripple of the machine. A method for calculating the optimal reference currents based on the stator joule loss is proposed. The proposed method is compared to two methods used in the literature, the FOC and MTPA methods. A comparative study between the three methods based on the torque ripple rate shows that the proposed method allows a significant reduction in the torque ripple. The second contribution to the minimization of the torque ripple is to propose a sliding mode control. This control suffers from the phenomenon of “Chattering” which affects the torque ripple. To solve this problem, a second-order sliding mode control is proposed. A comparative study between the different approaches shows that the second-order sliding mode provides the lowest torque ripple rate of the machine.

Modeling, Control and Diagnosis of Electrical Machines and Devices

“…This section provides a summary of this Special Issue of Energies, which includes published articles [1][2][3][4][5][6][7][8][9][10] covering various topics related to the modeling, control, and diagnosis of electrical devices.…”

“…Aladetola et al [8] developed a control approach to minimize the issue of torque ripple effects in synchronous reluctance machines (SynRMs). This work was performed in two steps: Initially, the reference current calculation bloc was modified to reduce the torque ripple of the machine.…”

Advancements in Flux Switching Machine Optimization: Applications and Future Prospects

“…Torque ripple refers to the fluctuation in torque output during each revolution of an electrical machine resulting from variations in the electromagnetic fields and their interactions between the rotor and stator [88]. Minimizing the torque ripple is crucial for achieving smooth and stable machine operation, as excessive fluctuations can lead to undesirable vibrations and noise.…”

“…In [88], an analytical model was proposed to reduce the air-gap permeance variation and torque ripples in an 8-slots-6-poles single-phase electrically excited FSM. The rotor poleshaping technique was employed to minimize the variation in the air-gap permeance.…”

Research on Innovative Hybrid Excited Synchronous Machine

“…Synchronous Reluctance machines are being extensively developed by scientists around the world. Some important designs are presented in papers [11][12][13][14][15][16]. In order to achieve higher machine torque values and to further increase the power density, the SynRM machine design was successively modified by adding magnetic field sources (permanent magnets) in the rotor.…”