Optimization of Air-Gap Profile in Interior Permanent-Magnet Synchronous Motors for Torque Ripple Mitigation

Liang, Jingchen; Parsapour, Amir; Yang, Zhuo; Caicedo-Narvaez, Carlos; Moallem, Mehdi; Fahimi, Babak

doi:10.1109/tte.2019.2893734

Cited by 52 publications

(22 citation statements)

References 23 publications

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“…The mechanism of the ASSR with a single lamination model is illustrated by examples of different pole pairs and step numbers. The step number can be determined by (12), but also constrained by the skewing angles, the pole arc width, and the manufacturing complexity. The torque performances of the SPPMSM with the NSR, CSSR, and ASSR are evaluated by FEA and experimental tests.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…The cogging torque waveform of the interior PMM is also smoother owing to the uniform air gap radial length. An uneven air gap increases the torque ripple [25], which can reduce bearing life, whereas a higher cogging torque requires a higher starting current to start rotating the motor. Cogging torque can be reduced by optimizing parameters, such as the pole arc to pole pitch ratio, stator slot opening width, etc.…”

Section: Cogging Torquementioning

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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“…A V-shaped arrangement makes a large region of permanent magnets per pole to be established, which can centralize the flux at the middle of the poles [28]. This increases the peak air gap flux density and produces a back EMF waveform that is close to a sine wave [29,30]. Moreover, it could raise the magnetic saliency to increase the incidence of the reluctance torque because the angle and length of the magnets can be adjusted to ensure a sufficient flux path along the q axis [31,32].…”

Section: Step 34 Rotor Topology Optimizationmentioning

confidence: 99%

Analysis and Design of a High-Performance Traction Motor for Heavy-Duty Vehicles

Lee

2020

Energies

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Due to environmental issues and depletion of resources, global attentiveness in electric vehicles (EVs) is growing. In particular, research on high specification motors for driving large EVs has attracted a lot of attention. In this study, an analysis and design process for a motor that can be universally applied in heavy vehicles to reduce environmental pollution was introduced. Motors for driving heavy vehicles require high specifications. Thus, an interior permanent magnet synchronous motor (IPMSM) with a delta-shaped magnet array was used to improve the torque and power characteristics. A step skew rotor structure was also used to dampen vibration and noise by minimizing the high-order harmonics in the cogging torque. The proposed analysis and design approach also reduces the total harmonic distortion (THD) of the back electromotive force (EMF). The effectiveness of the proposed analysis and design process and the usefulness of the resulting high-performance traction motor for heavy-duty vehicles were verified via the finite element method (FEM) and by experiment.

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Optimization of Air-Gap Profile in Interior Permanent-Magnet Synchronous Motors for Torque Ripple Mitigation

Cited by 52 publications

References 23 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

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

Analysis and Design of a High-Performance Traction Motor for Heavy-Duty Vehicles

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