Limitations and Constraints of Eddy-Current Loss Models for Interior Permanent-Magnet Motors with Fractional-Slot Concentrated Windings

Zhang, Hui; Wallmark, Oskar

doi:10.3390/en10030379

Cited by 8 publications

(2 citation statements)

References 28 publications

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“…Permanent magnet machines (PMMs) are mainly manufactured with one-piece stator cores. Among these machines, fractional-slot concentrating winding topologies ensure low cogging torque, low copper losses and high torque density [1][2][3]. Recently, segmented stator core (SSC) structures have attracted increasing interest since, compared to one-piece stator machines, they allow an easier manufacturing process and reduced material wastage, especially when large machines are considered such as wind and tidal power generators [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Design Method for the Cogging Torque Minimization of Permanent Magnet Machines with a Segmented Stator Core Based on ANN Surrogate Models

et al. 2021

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Permanent magnet machines with segmented stator cores are affected by additional harmonic components of the cogging torque which cannot be minimized by conventional methods adopted for one-piece stator machines. In this study, a novel approach is proposed to minimize the cogging torque of such machines. This approach is based on the design of multiple independent shapes of the tooth tips through a topological optimization. Theoretical studies define a design formula that allows to choose the number of independent shapes to be designed, based on the number of stator core segments. Moreover, a computationally-efficient heuristic approach based on genetic algorithms and artificial neural network-based surrogate models solves the topological optimization and finds the optimal tooth tips shapes. Simulation studies with the finite element method validates the design formula and the effectiveness of the proposed method in suppressing the additional harmonic components. Moreover, a comparison with a conventional heuristic approach based on a genetic algorithm directly coupled to finite element analysis assesses the superiority of the proposed approach. Finally, a sensitivity analysis on assembling and manufacturing tolerances proves the robustness of the proposed design method.

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Section: Introductionmentioning

confidence: 99%

A Design Method for the Cogging Torque Minimization of Permanent Magnet Machines with a Segmented Stator Core Based on ANN Surrogate Models

et al. 2021

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“…In [18,20,30], the influence of slot-pole selection was analyzed, but for the IPM (Interior Permanent Magnet) motor with concentrated windings, not SPM motors. In [16], 3-phase, 5-phase and 7-phase machines with a rotor with embedded magnets are analyzed.…”

Section: Introductionmentioning

confidence: 99%

Study on the Selection of the Number of Magnetic Poles and the Slot-Pole Combinations in Fractional Slot PMSM Motor with a High Power Density

2021

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Fractional slot, PMSM motors with a properly designed electromagnetic circuit allow for obtaining high power density factors (more than 4 kW per 1 kg of total motor weight). The selection of the number of magnetic poles to the specific dimensions and operating conditions of the motor, as well as the number of slots for the selected number of magnetic poles is the subject of the analysis in this article. This issue is extremely important because it affects the mass of the motor, the value of shaft torque, shaft power and the value of rotor losses. The aim of the work is to select solutions with the highest values of power density factor and, at the same time, the lowest values of rotor losses. The object of the study is a fractional slot PMSM motor with an external solid rotor core with surface permanent magnets (SPM). Motor weight is approximately 10 kg, outer diameter is 200 mm and a maximum power is 50 kW at 4800 r/min. The article analyzes the selection of magnetic poles in the range from 2p = 12 to 2p = 24 and various slot-pole combinations for individual magnetic poles. The target function of the objective was achieved and the calculations results were verified on the physical model. The best solutions were 20-pole, 30-slots (highest efficiency and lowest rotor loss) and 24-pole, 27 slots (highest power density).

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Pole-Slot Selection Considerations for Double Layer Three-phase Tooth-Coil Wound Electrical Machines

Skoog

Acquaviva

2018

2018 XIII International Conference on Electrical Machines (ICEM)

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Limitations and Constraints of Eddy-Current Loss Models for Interior Permanent-Magnet Motors with Fractional-Slot Concentrated Windings

Cited by 8 publications

References 28 publications

A Design Method for the Cogging Torque Minimization of Permanent Magnet Machines with a Segmented Stator Core Based on ANN Surrogate Models

A Design Method for the Cogging Torque Minimization of Permanent Magnet Machines with a Segmented Stator Core Based on ANN Surrogate Models

Study on the Selection of the Number of Magnetic Poles and the Slot-Pole Combinations in Fractional Slot PMSM Motor with a High Power Density

Pole-Slot Selection Considerations for Double Layer Three-phase Tooth-Coil Wound Electrical Machines

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