Torque Ripple Reduction of SynRM Using Machaon Type Lamination

Kafadar, Ahmet Suat; Tap, Alper; Ergene, Lale T.

doi:10.1109/ceit.2018.8751815

Cited by 6 publications

(6 citation statements)

References 15 publications

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“…Due to the half-wave symmetry proved above, only odd order spatial harmonics appear in Structure I as given in Equation (11) and in Structure IV as in Equation (12). However, both odd and even order spatial harmonics exist in Structure II as in Equation (11) and in Structure III as in Equation (12), where A νi is an intermediate coefficient related to the Λ b , Λ g and θ k .…”

Section: Analytical Modelmentioning

confidence: 91%

“…f r (θ r ) is further processed with Fourier transform, and θ r is replaced with θ s , as θ r = θ s − ωt/p, the rotor magnetic potential is thus transformed to the stator frame in order to facilitate the analysis of radial force on the stator teeth. Due to the half-wave symmetry proved above, only odd order spatial harmonics appear in Structure I as given in Equation (11) and in Structure IV as in Equation (12). However, both odd and even order spatial harmonics exist in Structure II as in Equation ( 11) and in Structure III as in Equation (12), where A νi is an intermediate coefficient related to the Λ b , Λ g and θ k .…”

Section: Analytical Modelmentioning

confidence: 92%

“…For example, as illustrated in Figure 1(b), the rotor flux barriers are symmetric about the q-axis (i.e. the direction of maximum magnetoresistance) but asymmetric about the d-axis (the direction of minimum magnetoresistance) [5][6][7][8][9][10][11]. This kind of asymmetric rotor is called Structure II.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Radial electromagnetic force and vibration in synchronous reluctance motors with asymmetric rotor structures

Lin

Sun

Wang

et al. 2021

IET Electric Power Appl

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Asymmetrical rotor topologies were previously proposed for synchronous reluctance motors (SynRM) to reduce the torque ripple. However, potential negative effect of these topologies on mechanical vibration, which is often serious in SynRM, was hardly studied and such an effect is investigated here. An analytical model is established, through which the spatial orders of the radial electromagnetic force with various rotor topologies are derived, and the relationship of the peak frequencies and the corresponding spatial orders in the radial electromagnetic force is revealed. It is shown that some asymmetric rotor topologies will reduce the order of the lowest spatial harmonic for the radial electromagnetic force, and consequently increase the vibration. Finite element analysis and experiments demonstrate the same results. Finally, a specific rotor topology with asymmetry about both d-axis and q-axis is recommended, which can reduce the torque ripple, but would not deteriorate the radial electromagnetic force and vibration.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Analytical Modelmentioning

confidence: 91%

Section: Analytical Modelmentioning

confidence: 92%

See 1 more Smart Citation

Radial electromagnetic force and vibration in synchronous reluctance motors with asymmetric rotor structures

Lin

Sun

Wang

et al. 2021

IET Electric Power Appl

View full text Add to dashboard Cite

show abstract

“…On the other hand, a priori (prior to optimization) ripple reduction methods are: increasing the number of poles, application of barrier corner fillets [10], use of barrier notch (Figure 2a), and use of asymmetric pole designs [17]. The function of the barrier notch is to further increase rotor reluctance, otherwise, the flux lines would distribute between adjacent slots thus contributing to the loss of torque and consequently increasing the torque ripple.…”

Section: Syrm Disadvantages and Potential Solutionsmentioning

confidence: 99%

“…One of the inherent disadvantages of the SyRM is the increased torque ripple. The issue can be mitigated with the use of asymmetric rotor poles [17,19] or with rotor or stator skewing [40,41]. The drawback of using skewing in optimization is a prolonged transient calculation (it has to be done for each of the rotor slices, e.g., 5 segment rotor skew will have 5 times longer transient simulation).…”

Section: Torque Ripple Mitigationmentioning

confidence: 99%

Systematic Metamodel-Based Optimization Study of Synchronous Reluctance Machine Rotor Barrier Topologies

Ban

Stipetić

2022

Machines

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Nowadays, due to the confidence in modeling tools and rapid product iteration, electric machine designers primarily rely on simulations. This approach reduces time and cost and is very useful when comparing different machine topologies. The prototype stage usually comes after the depletion of all simulation resources. When designing a synchronous reluctance machine, the first step is the selection of rotor barrier type. The literature provides several topologies but does not clearly state which one yields the best performance. The goal of this paper is to determine the best variant for a six-pole machine and the selected requirements using a metamodel-based optimization approach. Seven rotor topologies with different complexities were derived from circular, hyperbolic, and Zhukovsky barrier types (circular concentric, circular variable depth, hyperbolic with fixed eccentricity, hyperbolic with variable eccentricity, original Zhukovsky, modified Zhukovsky variable depth and modified Zhukovsky with equal barrier depth). The novelty of the proposed strategy is in the systematic and fair comparison of different rotor topologies. This approach significantly reduces the total optimization time from several weeks to a few days. Additionally, a novel modified Zhukovsky variable depth topology, which merges the best qualities of all considered variants, was developed. An identical optimization strategy was applied to all variants, and the final results prove that the barrier type substantially affects the final performance of the machine. The best results are achieved by the modified Zhukovsky variable depth topology. In relation to the worst (baseline) topology, the performance gain is 14.9% and the power factor is increased from 0.61 to 0.67. An additional study using different numbers of barrier layers (3, 4, and 5) was conducted to determine the best topology. The best results were achieved with the original four barrier layers.

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Design and Torque Ripple Reduction Methods for Synchronous Reluctance Machine applied in Electric Power Take-off actuation

Ban

Andersson²,

Stipetić

2022

2022 International Conference on Electrical Machines (ICEM)

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Torque Ripple Reduction of SynRM Using Machaon Type Lamination

Cited by 6 publications

References 15 publications

Radial electromagnetic force and vibration in synchronous reluctance motors with asymmetric rotor structures

Radial electromagnetic force and vibration in synchronous reluctance motors with asymmetric rotor structures

Systematic Metamodel-Based Optimization Study of Synchronous Reluctance Machine Rotor Barrier Topologies

Design and Torque Ripple Reduction Methods for Synchronous Reluctance Machine applied in Electric Power Take-off actuation

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