Reduction of torque and radial force fluctuation in permanent magnet synchronous motors by means of multi-objective optimization

Krotsch, Jens; Ley, Thomas; Piepenbreier, Bernhard

doi:10.1109/edpc.2011.6085546

Cited by 9 publications

(3 citation statements)

References 31 publications

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“…The outer rotor 12-slot 10-pole PMSM was originally designed for a blower application [8]. This type of an application requires silent work, which together with tuning of the radial force (reduction of the radial force strength and elimination of its low order harmonic components) [25], also demands a low torque ripple. The geometry optimization of the stator is shown in Fig.…”

Section: Torque Ripple Reduction Methodsmentioning

confidence: 99%

Unequal Teeth Widths for Torque Ripple Reduction in Permanent Magnet Synchronous Machines With Fractional-Slot Non-Overlapping Windings

et al. 2015

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Permanent magnet synchronous machines with fractional-slot non-overlapping windings (FSPMSM), also known as tooth-coil winding permanent magnet synchronous machines (TCW PMSM), have been under intensive research during the latest decade. There are many optimization routines explained and implemented in the literature in order to improve the characteristics of this machine type.This paper introduces a new technique for torque ripple minimization in TCW PMSM. The source of torque harmonics is also described. The low order torque harmonics can be harmful for a variety of applications, such as direct drive wind generators, direct drive light vehicle electrical motors, and for some high precision servo applications.The reduction of the torque ripple harmonics with the lowest orders (6 th and 12 th ) is realized by machine geometry optimization technique using finite element analysis (FEA). The presented optimization technique includes the stator geometry adjustment in TCW PMSMs with rotor surface permanent magnets and with rotor embedded permanent magnets. Influence of the permanent magnet skewing on the torque ripple reduction and cogging torque elimination was also investigated. It was implemented separately and together with the stator optimization technique. As a result, the reduction of some torque ripple harmonics was attained.

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Section: Torque Ripple Reduction Methodsmentioning

confidence: 99%

Unequal Teeth Widths for Torque Ripple Reduction in Permanent Magnet Synchronous Machines With Fractional-Slot Non-Overlapping Windings

et al. 2015

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“…The radial force is not a type of actual force (tangential force) but rather affects the vibration or acoustic performance [4][5][6]. Furthermore, the direction of this force coincides with the scattering direction of the rotors, which is caused by the centrifugal force of the rotors, and is used to produce a more exact result when it is accounted for in the calculation of stresses.…”

Section: Calculation Of the Radial Forcementioning

confidence: 99%

A Stress Analysis Method for the Rotor Design of an IPMSM Considering Radial Force

Kim¹

2014

Journal of Electrical Engineering and Technology

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-In the design of the rotor of an interior permanent magnet synchronous motor (IPMSM), the bridge between the permanent magnets helps prevent the scattering of permanent magnets and pole pieces during high-speed operation. In the design of a motor, if the bridge is too thick, its performance will be largely degraded because of flux leakage. Additionally, if the bridge is too thin, its mechanical safety cannot be guaranteed. Thus, an accurate analysis method is required to determine the thickness of the bridge. Conventional stress analysis methods determine the thickness of the bridge by only considering the centrifugal force of the rotors. In this study, however, a method that additionally considers the radial force generated by the air-gap flux density based on the conventional methods is proposed and reflected in the design of a traction motor for electric vehicles. Finally, the validity of this study is verified through a reliability test related to high-speed operation.

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“…The reduction of UMF has also been widely investigated for decades. Various methods have been proposed which can be classified as machine control methods and machine design optimizations [16]. As for the machine control methods, field weakening commutation strategy can be used to minimize on-load UMF [17].…”

Section: Introductionmentioning

confidence: 99%

Mitigation of Unbalanced Magnetic Force in a PM Machine With Asymmetric Winding by Inserting Auxiliary Slots

Zhu

2018

IEEE Trans. on Ind. Applicat.

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Reduction of torque and radial force fluctuation in permanent magnet synchronous motors by means of multi-objective optimization

Cited by 9 publications

References 31 publications

Unequal Teeth Widths for Torque Ripple Reduction in Permanent Magnet Synchronous Machines With Fractional-Slot Non-Overlapping Windings

Unequal Teeth Widths for Torque Ripple Reduction in Permanent Magnet Synchronous Machines With Fractional-Slot Non-Overlapping Windings

A Stress Analysis Method for the Rotor Design of an IPMSM Considering Radial Force

Mitigation of Unbalanced Magnetic Force in a PM Machine With Asymmetric Winding by Inserting Auxiliary Slots

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