Analytical Model for Cogging Torque Calculation in Surface-Mounted Permanent Magnet Motors With Rotor Eccentricity and Magnet Defects

Tong, Wenming; Li, Shiqi; Pan, Xuelong; Wu, Shengnan; Tang, Renyuan

doi:10.1109/tec.2020.2995902

Cited by 75 publications

(31 citation statements)

References 26 publications

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“…However, cogging torque and torque ripple of motors increase due to rotor eccentricity. Rotor eccentricity is frequently generated for various reasons, such as the assembly tolerances of bearings or housings, defects in bearings, and the manufacturing process of the motor [3][4][5][6][7][8]. Rotor eccentricity is classified into static eccentricity (SE) and dynamic eccentricity (DE).…”

Section: Introductionmentioning

confidence: 99%

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Park

Kim

et al. 2021

Energies

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Static eccentricity (SE) is frequently generated by manufacturing processes. As the nonuniformity of the air-gap length is caused by the SE, the torque ripple and cogging torque increase in the motor. This study analyzes the distorted back electromotive force (EMF) and cogging torque due to SE. Further, a motor design considering SE is performed for stable back EMF and low cogging torque. First, the SE was diagnosed and analyzed using the back EMF and cogging torque measured from the test results of the base model. In addition, the rotor position was calculated using the unbalanced back EMF due to the SE. The calculated rotor position is used when analyzing phenomena due to SE and applied to robust design. Subsequently, robust design optimization was performed to improve the unbalanced back EMF and cogging torque due to SE. Using finite element analysis (FEA) considering SE, the shape of the stator was designed based on the base model. The estimated rotor position from the base model was applied to the optimum model to confirm its robustness from SE’s effects. Finally, the base and optimum models were compared through the test results.

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Section: Introductionmentioning

confidence: 99%

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Park

Kim

et al. 2021

Energies

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“…Any actual situation of air-gap eccentricity is a different combination of static and dynamic eccentricity [20][21][22]. A schematic diagram of air-gap eccentricity is shown in Figure 1.…”

Section: Geometric Structure Of Air-gap Eccentricitymentioning

confidence: 99%

Static Eccentricity Fault Analysis of Surface-Mounted Permanent Magnet Electromotor with Skewed Slots Based on 2D FEA

Wang

2021

WEVJ

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It is of significance to analyze the performance of eccentric electromotor for the research on the electric vehicle wheel drive system’s operational reliabilities. We developed a fast equivalent algorithm in which the two-dimensional finite element calculation results are translated into three-dimensional calculation results. An electromotor with skewed slot was decomposed into straight-slot electromotor units that were series-wound. A prototype electromotor driven by square wave current under healthy and eccentric conditions was calculated, and the computation accuracy of the equivalent algorithm was analyzed. The air-gap magnetic field and induced electromotive force were calculated and contrasted. The study results indicate that the magnetic field distribution and the induced electromotive forces of winding elements with different axis positions were affected transparently by grievous eccentricity, yet the induced electromotive force of one phase winding and average value of torque remained virtually invariable. The reference to reliability analysis of electric vehicle wheel drive system is provided.

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“…Compared with the FEM, the analysis method can accurately predict the magnetic field distribution by solving the Laplace equation and Poisson equation with boundary conditions [10][11][12]. In 2009, Dubas F. proposed a subdomain model method to analyse the magnetic field distribution of permanent magnet motors [13].…”

Section: Introductionmentioning

confidence: 99%

Analytical modelling for magnetic field of interior permanent magnet synchronous motors accounting for bridge saturation

Wang

Sun

Zhong

et al. 2022

IET Electric Power Appl

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Analytical Model for Cogging Torque Calculation in Surface-Mounted Permanent Magnet Motors With Rotor Eccentricity and Magnet Defects

Cited by 75 publications

References 26 publications

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Static Eccentricity Fault Analysis of Surface-Mounted Permanent Magnet Electromotor with Skewed Slots Based on 2D FEA

Analytical modelling for magnetic field of interior permanent magnet synchronous motors accounting for bridge saturation

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