article · Energies
Synchronous reluctance motors depend heavily on rotor geometry to achieve high efficiency, strong torque density, and minimal torque ripple. Optimising this geometry through finite element methods requires substantial computational time due to the high number of variables involved. Rotor flux-barrier widths and angles represent the most critical parameters determining output torque and torque ripple. To simplify this design challenge, a set of easy-to-use parameterised equations has been developed to select suitable values for both variables. The approach targets distributed-winding synchronous reluctance motors across a wide design range. Sensitivity analyses demonstrate how adjusting these two parameters influences motor performance. When compared to three alternative design approaches across configurations with three, four, and five flux barriers, the proposed equations successfully balance low torque ripple with higher average torque, with findings confirmed by experimental testing.
Designing synchronous reluctance motors usually requires computationally expensive simulation software to fine-tune rotor geometry. By replacing intensive numerical optimisation with direct analytical equations, engineers can rapidly design motors that deliver high torque with smooth, low-ripple operation. This streamlines the development of efficient electric drives while reducing the computational resources and design time typically needed during early engineering phases.
Motor manufacturers and electric drive designers can use these equations to streamline the engineering of synchronous reluctance motors with distributed windings. Because the analytical framework has been validated through finite element simulations and physical experimental testing, the methodology represents an applied and tested engineering tool. It can be integrated into industrial design workflows to accelerate the development of high-torque, low-vibration electric machines.
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The rotor design of Synchronous Reluctance Motors (SynRMs) has a large effect on their efficiency, torque density and torque ripple. In order to achieve a good compromise between these three goals, an optimized rotor geometry is necessary. A finite element method (FEM) is a good tool for the optimization. However, the computation time is an obstacle as there are many geometrical parameters to be optimized. The flux-barrier widths and angles are the two most crucial parameters for the SynRM output torque and torque ripple. This paper proposes an easy-to-use set of parametrized equations to select appropriate values for these two rotor parameters. With these equations, the reader can design a SynRM of distributed windings with a low torque ripple and with a better average torque. The methodology is valid for a wide range of SynRMs. To check the validity of the proposed equations, the sensitivity analysis for the variation of these two parameters on the SynRM torque and torque ripple is carried out. In addition, the analysis in this paper gives insight into the behavior of the machine as a function of these two parameters. Furthermore, the torque and torque ripple of SynRMs having a rotor with three, four and five flux-barriers are compared with three literature approaches. The comparison shows that the proposed equations are effective in choosing the flux-barrier angles and widths for low torque ripple and better average torque. Experimental results have been obtained to confirm the FEM results and to validate the methodology for choosing the rotor parameters.
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DOI: 10.3390/en9110942
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