Analytical Calculation of Surface-Inset PM In-Wheel Motors and Reduction of Torque Ripple

Zhang, H. S.; Yang, Minglei; Zhang, Y.; Tuo, Jiying; Luo, Shuang; Xu, Jin

doi:10.1109/tmag.2020.3034882

Cited by 14 publications

(9 citation statements)

References 25 publications

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“…Shin et al [27] obtained optimal slot opening and pole arc ratio to minimize the cogging torque of SPM machine by using the subdomain analysis. The torque ripple change due to the flux modulation slot of SPM machine was also well predicted [28]. However, the cores are assumed to be infinitely permeable in most subdomain analysis.…”

Section: Introductionmentioning

confidence: 85%

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Torque Ripple Minimizing of Uniform Slot Machines with Delta Rotor via Subdomain Analysis

2021

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Since the slot opening is large in the uniform slot machine, the torque ripple generated by overlapping or misaligning with the rotor cavity is remarkably large in the case of interior permanent magnet (IPM) machine. In this work, it is observed that the magnitude of torque ripple depends strongly on the phase difference between air-gap field harmonics: The ripple is minimized when the two dominant harmonic components cancel each other. Based on this fact, a condition is developed to minimize torque ripple by adjusting the q-flux channel width and d-flux barrier width. The torque ripple minimizing solution is found from a level chart made by subdomain time-stepping analysis. Finite element analysis (FEA) also gives a very similar minimizing solution. A prototype machine is manufactured, and its performances are validated through experiments.

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Section: Introductionmentioning

confidence: 85%

“…According to (28), the phase difference α rl − α θl of the field harmonics determines the lth order torque component along with the magnitude, T l . In the machine under consideration, the 11th and 13th harmonic components are dominant.…”

Section: Torque Ripple and Harmonic Phase Conditionmentioning

confidence: 99%

Torque Ripple Minimizing of Uniform Slot Machines with Delta Rotor via Subdomain Analysis

2021

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“…Each subdomain’s governing equations are established in 2-D polar coordinates according to the type of excitation sources. Namely, the PM and stator slot regions satisfy Poisson’s equation, while the air-gap and slot opening regions satisfy Laplace’s equation (Zhang et al , 2021a, 2021b): where J i is the current density of the i -th stator slot. The general solution of the magnetic vector potential in each subdomain can be obtained using the separation method.…”

Section: Analytical Modelmentioning

confidence: 99%

“…Each subdomain's governing equations are established in 2-D polar coordinates according to the type of excitation sources. Namely, the PM and stator slot regions satisfy Poisson's equation, while the air-gap and slot opening regions satisfy Laplace's equation (Zhang et al, 2021a(Zhang et al, , 2021b:…”

Section: Solution Of Magnetic Vector Potentialmentioning

confidence: 99%

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Magnetic field and electromagnetic performance analysis of permanent magnet machines with segmented Halbach array

Zhang

Wang

Tuo

et al. 2021

COMPEL

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Purpose This study aims to accurately calculate the magnetic field distribution, which is a prerequisite for pre-design and optimization of electromagnetic performance. Accurate calculation of magnetic field distribution is a prerequisite for pre-design and optimization. Design/methodology/approach This paper proposes an analytical model of permanent magnet machines with segmented Halbach array (SHA-PMMs) to predict the magnetic field distribution and electromagnetic performance. The field problem is divided into four subdomains, i.e. permanent magnet, air-gap, stator slot and slot opening. The Poisson’s equation or Laplace’s equation of magnetic vector potential for each subdomain is solved. The field’s solution is obtained by applying the boundary conditions. The electromagnetic performances, such as magnetic flux density, unbalanced magnetic force, cogging torque and electromagnetic torque, are analytically predicted. Then, the influence of design parameters on the torque is explored by using the analytical model. Findings The finite element analysis and prototype experiments verify the analytical model’s accuracy. Adjusting the design parameters, e.g. segments per pole and air-gap length, can effectively increase the electromagnetic torque and simultaneously reduce the torque ripple. Originality/value The main contribution of this paper is to develop an accurate magnetic field analytical model of the SHA-PMMs. It can precisely describe complex topology, e.g. arbitrary segmented Halbach array and semi-closed slots, etc., and can quickly predict the magnetic field distribution and electromagnetic performance simultaneously.

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Analysis of Cogging Torque of Yokeless and Segmented Armature Axial Field Permanent Magnet Synchronous Motor Based on Different Stator Topologies

Wang

Liu

Zhang

2023

Lecture Notes in Electrical Engineering

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Analytical Calculation of Surface-Inset PM In-Wheel Motors and Reduction of Torque Ripple

Cited by 14 publications

References 25 publications

Torque Ripple Minimizing of Uniform Slot Machines with Delta Rotor via Subdomain Analysis

Torque Ripple Minimizing of Uniform Slot Machines with Delta Rotor via Subdomain Analysis

Magnetic field and electromagnetic performance analysis of permanent magnet machines with segmented Halbach array

Analysis of Cogging Torque of Yokeless and Segmented Armature Axial Field Permanent Magnet Synchronous Motor Based on Different Stator Topologies

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