The characteristics analysis and cogging torque optimization of a surface-interior permanent magnet synchronous motor

Si, Jikai; Zhao, Suzhen; Zhang, Lufeng; Cao, Ruiwu; Cao, Wenping

doi:10.23919/cjee.2018.8606788

Cited by 19 publications

(15 citation statements)

References 21 publications

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“…12 and 13 show the instant cogging torque contribution of individual field harmonics in the 36and 18-slot motors. The cogging torque produced by the k-th magnetic field harmonic can be calculated by formula (6) in the entire electric period. For the 12-pole/36-slot motor, with the concentric magnet pole, the total cogging torque is mainly determined by the 6-th, 18-th, 30-th, and 42-th order field harmonics as shown in Fig.…”

Section: Simulationmentioning

confidence: 99%

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Influence of magnet shape on the cogging torque of a surface-mounted permanent magnet motor

Zhou

Zhang

Zhao

et al. 2019

Chin. J. Electr. Eng.

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The influence of bread-loaf shaped magnet poles under parallel magnetization on the cogging torque of surface-mounted permanent magnet (SPM) motors is studied. For the SPM motors having magnetic poles with eccentricity and sine harmonic compensation, the electromagnetic performances of integer and fractional slot motors are compared. It is found that the cogging torque and torque ripple of the integer and fractional slot motors can be reduced with the same eccentric magnet pole. The cogging torque and torque ripple of a fractional slot motor can be decreased by sine harmonic compensation, however, the same sine harmonic compensation has a small influence in integer slot motors. By varying the magnetic poles, the contribution of the field harmonics (k = (2n + 1) p), which are a direct result of magnet magnetization, to the cogging torque also changes. The electromagnetic performance of a 3 kW prototype is tested, and it is found that the experimental results validate the theoretical investigation.

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Section: Simulationmentioning

confidence: 99%

“…To minimize the cogging torque, many methods have been studied. In particular, skewing of the stator slots has been widely used to reduce cogging torque [6][7] . However, the skewing of stator slots is difficult and can therefore increase production costs.…”

Section: Introductionmentioning

confidence: 99%

Influence of magnet shape on the cogging torque of a surface-mounted permanent magnet motor

Zhou

Zhang

Zhao

et al. 2019

Chin. J. Electr. Eng.

View full text Add to dashboard Cite

show abstract

“…Cogging torque and torque ripple minimization are treated by many authors throughout the design stage [7], [8], [9], [10], [11], [12], [13]. The applied techniques, e.g., skewing, follow a decrease of efficiency and thus one has to consider a tradeoff regarding the maximization of efficiency while minimizing the torque ripple and cogging torque.…”

Section: Introductionmentioning

confidence: 99%

Optimization of PMSMs Considering Multi-Harmonic Current Waveforms: Theory, Design Aspects, and Experimental Verification

Bramerdorfer

Amrhein

2023

IEEE Trans. on Ind. Applicat.

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This article is about investigating the potential of multi-harmonic design of permanent magnet synchronous machines. Thereby, multi-harmonic refers to the temporal periodic characteristics of linked fluxes and currents of the stator phases in order to ensure high-efficient operation with very low torque ripple. At first, a suitable model allowing for multi-harmonic currents evaluation is derived. Consequently, an interior-rotor IPM machine is studied. In order to have a fair comparison with conventional PMSMs featuring sinusoidal currents, an optimization scenario is defined where the same outer dimensions as well as magnet and copper volume for both design variants are considered. The use of multiple current harmonics requires a dedicated strategy for evaluating machine designs, as the conventional dq-grid analysis cannot be utilized. The introduced approach is applied and results of the optimization are illustrated. Prototypes were manufactured and machine designs were subsequently evaluated through experiments. A valuable lesson learned during practical implementation regarding rotor angle determination is highlighted. Measurement results reveal that adding more degrees of freedom in terms of multiple harmonics can give significant improvements for performance measures efficiency and torque ripple. This particularly holds if the harmonics are already considered throughout the machine design and optimization process, rather than only at post-processing stage.

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“…In [19], the surface interior permanent magnet synchronous motor is introduced and the optimal stator skewed slot analytical method for cogging torque reduction is proposed. Wang et al propose a combined method including Taguchi method, response surface methodology and genetic algorithm for cogging torque optimization [20].…”

Section: Introductionmentioning

confidence: 99%

“…In [19], the surface interior permanent magnet synchronous motor is introduced and the optimal stator skewed slot analytical method for cogging torque reduction is proposed. Wang et al.…”

Section: Introductionmentioning

confidence: 99%

Analysis and reduction of cogging torque in direct‐drive external‐rotor permanent magnet synchronous motor for belt conveyor application

Song

Zhang

et al. 2021

IET Electric Power Appl

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Permanent magnet synchronous motor (PMSM) shows the great potential for use in direct drive system because of its excellent low‐speed direct‐drive capability. However, it suffers from the adverse effect of the cogging torque in comparison with the asynchronous motor. Therefore, reducing the cogging torque, especially the external‐rotor PMSM (ERPMSM) for belt conveyor application, is necessary for enhancing the stable operation and precise positioning performances of the belt conveyor.Herein, a novel tangential magnetization low‐speed high‐torque ERPMSM is proposed and analysed. Furthermore, the expression of the cogging torque of the proposed ERPMSM is derived by energy method. Based on the special structure of the ERPMSM, a new method for cogging torque reduction is introduced. The comparative FEA results for four ERPMSM models are presented to verify the accuracy and effectiveness of this method. The accuracy of the cogging torque FEA results is confirmed by a prototype. Finally, the influence of this method on ERPMSM performance is also analysed carefully in this paper.

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The characteristics analysis and cogging torque optimization of a surface-interior permanent magnet synchronous motor

Cited by 19 publications

References 21 publications

Influence of magnet shape on the cogging torque of a surface-mounted permanent magnet motor

Influence of magnet shape on the cogging torque of a surface-mounted permanent magnet motor

Optimization of PMSMs Considering Multi-Harmonic Current Waveforms: Theory, Design Aspects, and Experimental Verification

Analysis and reduction of cogging torque in direct‐drive external‐rotor permanent magnet synchronous motor for belt conveyor application

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