Reducing Torque Ripple Using Axial Pole Shaping in Interior Permanent Magnet Machines

Du, Zhentao S.; Lipo, T.Α.

doi:10.1109/tia.2019.2946237

Cited by 29 publications

(12 citation statements)

References 12 publications

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“…Over the last few decades, many effective techniques of the torque ripple reduction for PMSMs have been extensively investigated. From the stator side, design and optimization methods are carried out on different parts, e.g., slot-opening width, auxiliary tooth, dummy slot, tooth width, and skewing [5]- [9]. Similarly, it is also proved to be effective in rotor optimization, e.g., pole shaping, pole arc width, auxiliary salient poles, and rotor skewing [9]- [18].…”

Section: Introductionmentioning

confidence: 99%

Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design

Chen

et al. 2020

IEEE Access

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In this paper, a salient-pole permanent magnet synchronous machine (SPPMSM) is introduced to high-speed trains, taking advantage of its high utilization of the reluctance torque from the unbalanced reactance. Torque characteristics, such as average torque and torque ripple, are rather important and should be carefully concerned during the optimal design of the SPPMSM. Both the eccentric air-gap and the advanced step-skewed rotor (ASSR) design are developed and implemented to reduce the torque ripple for comfort and safety issues. Compared to the conventional step-skewed rotor (CSSR), the ASSR takes advantage of the high utilization of permanent magnets (PMs), which are axial continuous assembled, and the easier manufacture with a single rotor lamination model, which is asymmetrically designed with pole shoes skewed by individual skewing angles. No skewing arrangement is applied to the rotor yoke and the PM chambers. The impacts of the eccentric air-gap and the ASSR on the torque characteristics are comprehensively investigated by finite element analysis. The results show that the proposed technique can significantly reduce the torque ripple with a slight expense of the average torque. Based on the optimal eccentric design, experiments of the SPPMSM with the non-skewed rotor, CSSR, and ASSR under various conditions are carried out to validate the estimated results. INDEX TERMS Eccentricity design, permanent magnet synchronous machine, step-skewed rotor, torque ripple.

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Section: Introductionmentioning

confidence: 99%

Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design

Chen

et al. 2020

IEEE Access

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“…Airgap variations, unequal interpolar separation, skewing, notching, rotor pole-pairing and optimization are the techniques discussed in literature to reduce the cogging torque. Apart from recent efforts made to reduce the torque ripples, the average torque reduction is inevitable regardless the choice of either pole shaping or skewing [34]. This paper achieves a very low torque ripples with a minimum decrease in average torque by using a right-angled trapezoidal magnet shape.…”

Section: B Proposed Magnet Shapementioning

confidence: 99%

Reduction of Torque Ripples in Multi-Stack Slotless Axial Flux Machine by Using Right Angled Trapezoidal Permanent Magnet

et al. 2021

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The aim of this paper is to design, analyze and optimize the "Multi-Stack Slotless Axial Flux Switching Permanent Magnet Machine". In the design process, mathematical models are implemented, and the Finite Element Method (FEM) is performed to analyze the machine performances. The paper aims to minimize the occurrence of cogging torque and torque ripple in the multi-stack slotless stator AFPM machine. As a consequence, it reduces the vibrations in the machine and increases its life span. Multi-stack slotless stator AFPM machine with a right-angled trapezoid-shaped PM is proposed and comparison is done with conventional shape AFPM machine. In order to examine the performance of multi-stack slotless stator AFPM machine Finite Element Analysis (FEA) is used. To further enhance the characteristics of the designed machine with the proposed right-angled PM shape, optimization is done by considering inner and outer pole pitch as the design variables. In optimization process, krigging method assigned with Latin Hyper-cube Sampling and a genetic algorithm (GA) is performed due to suitability with non-linear data. Then, finite element analysis by JMAG-Designer is performed to verify the results. It is determined that optimized model has achieved 65% reduction in torque ripples as compared with the conventional design. Hence, this work attempts to optimize the performance of the AFPM machine.INDEX TERMS Axial flux machine, torque ripples, cogging torque, slotless stator, finite element analysis.

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“…However, PMMs develop torque ripple stemming from, among others, the cogging torque and the non-sinusoidal electromotive force waveform (EMF) in the air gap. This torque ripple causes acoustic noise and vibration, which can reduce the performance of position control and speed control systems, especially at low speeds and high load torque [3][4] [5]. Studies to eliminate or reducing cogging torque in PMMs were discussed by [6] [7].…”

Section: Introductionmentioning

confidence: 99%

Characteristics analysis of interior and inset type permanent magnet motors for electric vehicle applications

Irasari¹,

Wirtayasa²,

Widiyanto³

et al. 2021

J. Mechatron. Electr. Power Veh. Technol.

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Permanent magnet motors (PMMs) are widely used in electric vehicles because of their benefits. Based on the permanent magnet topologies on the rotor, PMMs are classified into three types: surface mounted PMM, inset PMM, and interior PMM. This paper discusses a comparison of the characteristics of interior and inset types of PMMs for electric vehicle applications. The study aims to find out the effect of the rotor construction on the magnetic characteristics, torque-speed characteristics, and cogging torque. Simulations were carried out analytically and numerically using the FEMM 4.2 software. The simulation results at the base speed show that the interior PMM generates a higher torque but with a lower rotation, namely 56.47 Nm and 3162 rpm, respectively, while the inset PMM produces higher rotation 4200 rpm but lower output torque of 46.01 Nm. However, with a higher saliency ratio, the interior PMM produces higher maximum torque and speed at both constant torque and field weakening regions than the PMM inset, which is 92.87 Nm and 6310 rpm, consecutively. In terms of cogging torque, the interior PMM raises it slightly higher (2.90 Nm) than the inset PMM (1.93 Nm). The results conclude that, in general, the interior PMM shows better performance in all studied regions and is preferable for electric vehicle applications.

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Reducing Torque Ripple Using Axial Pole Shaping in Interior Permanent Magnet Machines

Cited by 29 publications

References 12 publications

Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design

Torque Ripple Reduction of a Salient-Pole Permanent Magnet Synchronous Machine With an Advanced Step-Skewed Rotor Design

Reduction of Torque Ripples in Multi-Stack Slotless Axial Flux Machine by Using Right Angled Trapezoidal Permanent Magnet

Characteristics analysis of interior and inset type permanent magnet motors for electric vehicle applications

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