Influence of Pole and Slot Number Combinations on Cogging Torque in Permanent-Magnet Machines With Static and Rotating Eccentricities

Zhu, Z. Q.; Wu, Lijian; Jamil, Mohd Luqman Mohd

doi:10.1109/tia.2014.2308363

Cited by 72 publications

(46 citation statements)

References 23 publications

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“…For machine design, proper stator/rotor pole combination is known to be an important criterion to enhance the performance. By way of examples, in [6]- [11], the influence of stator/rotor pole combinations on electromagnetic performance is investigated for various machines, e.g., SRMs [6], [7], permanent magnet (PM) synchronous machines [8], [9], flux switching PM machines [10], synchronous reluctance machines [11]. As for VFRMs, the electromagnetic performance of 6s/(4, 5, 7, 8)r and 12s/ (8,10,11,13,14)r VFRMs are comparatively analyzed in [5] and [12], respectively.…”

Section: Asmentioning

confidence: 99%

Analysis of Stator/Rotor Pole Combinations in Variable Flux Reluctance Machines Using Magnetic Gearing Effect

Huang

Zhu

Feng

et al. 2019

IEEE Trans. on Ind. Applicat.

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The torque production of variable flux reluctance machines (VFRMs) is explained by the "magnetic gearing effect" in recent research. Based on this theory, this paper concludes the general principles for feasible stator/rotor pole selection and corresponding winding configuration for VFRMs. The influence of stator/rotor pole combination on torque performance is comprehensively investigated not only in terms of average torque and torque ripple, but also in terms of each single torque component. It is found that the synchronous torque is proportional to the fundamental rotor radial permeance component and has the dominant contribution in average torque for all the VFRMs. The stator slot number and rotor pole number should be close to each other to achieve the highest output torque. Meanwhile, the 6-stator-slot/(6i±2)-rotor-pole (6s/(6i±2)r) and their multiples are large torque ripple origins for VFRMs due to the large reluctance torque ripple. Also, it is proved that a lower stator slot number is preferable choice to obtain higher torque/copper loss ratio, whereas a higher stator slot number is more suitable for large machine scale scenario. Finally, the analyses and conclusions are verified by finite element analysis (FEA) on the 6-, 12-, 18-and 24-stator-slot VFRMs and by experimental tests on a 6s/7r and 6s/8r VFRMs.

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Section: Asmentioning

confidence: 99%

Analysis of Stator/Rotor Pole Combinations in Variable Flux Reluctance Machines Using Magnetic Gearing Effect

Huang

Zhu

Feng

et al. 2019

IEEE Trans. on Ind. Applicat.

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“…In [13] [15][1] [3] some analytical analysis is developed to characterize Maxwell magnetic forces harmonics in terms of spatial and time frequency orders, in no-load case and in loaded case including armature-field reaction. The effect of static and dynamic eccentricity is for instance investigated in [14] and [16], whereas the effect of magnet magnetization shape on vibration is studied in [18]. Besides radial and tangential airgap reluctant forces, some other phenomena can generate magnetic vibrations and acoustic noise.…”

Section: Vibro-acoustics Of High-speed Bldcmentioning

confidence: 99%

Analysis of the electromagnetic acoustic noise and vibrations of a high-speed brushless DC motor

Besnerais¹,

Souron²,

Devillers

2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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In this paper, the acoustic noise and vibrations due to Maxwell forces of a 4-pole, 12-slot, high-speed brushless DC motor (BLDC) is analysed up to 90 kRPM. The harmonic magnetic forces present in the machine are first analytically characterized, and validated with numerical simulations using MANATEE ® electromagnetic and vibro-acoustic software. The effects of rotor vibrations due to bearing faults, pole displacements and eccentricities are considered. Finally, some complete experimental measurements relying on "spatiogram" techniques are run to characterize the vibration waves (wavenumber and frequency) involved in acoustic noise generation. These results are compared to simulations and it is demonstrated that the observed high acoustic noise is due to machine imperfections creating harmonic forces exciting the bending mode of the shaft and the stator elliptical mode. Nomenclature Symbol Description fR mechanical frequency [Hz] fs electrical frequency [Hz] p pole pair number Zs stator slot number

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“…However, it was shown in [12] that the magnitude of the sub-harmonics depends on the operating conditions. In [13,14], it is shown that the relation between number of poles and slots effects the appearance of sub-harmonics related to eccentricity faults. To compensate these problems, the authors of [15] used harmonics instead of sub-harmonics in the voltage signal, in current controlled machine, as an indicator for detection.…”

Section: Introductionmentioning

confidence: 99%

Review of Detection Methods of Static Eccentricity for Interior Permanent Magnet Synchronous Machine

Aggarwal

Strangas

2019

Energies

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This paper compares the detection methods of static eccentricity in Interior Permanent Magnet Synchronous Machines (IPMSM). Four methods are discussed: The first method uses shift in the voltages in d–q plane to detect fault. The second method uses shift in peak of the incremental inductance curve for fault detection. The third method uses the combined information of harmonics present both in current and voltage to detect the fault. This makes the detection robust with respect to current controller bandwidth. Finally, the fourth method used for detection includes measuring vibrations using accelerometers. It is shown that all four methods detected static eccentricity. These methods are compared on the basis of utility of fault detection under online or offline conditions and under saturated conditions. For all four methods the machine was tested at healthy, 25% and 50% static eccentricity levels. Two-dimensional (2-D) Finite element analysis was used for simulating machine under healthy and faulty cases. The experiments were performed by controlling the machine using Labview Real-time.

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Influence of Pole and Slot Number Combinations on Cogging Torque in Permanent-Magnet Machines With Static and Rotating Eccentricities

Cited by 72 publications

References 23 publications

Analysis of Stator/Rotor Pole Combinations in Variable Flux Reluctance Machines Using Magnetic Gearing Effect

Analysis of Stator/Rotor Pole Combinations in Variable Flux Reluctance Machines Using Magnetic Gearing Effect

Analysis of the electromagnetic acoustic noise and vibrations of a high-speed brushless DC motor

Review of Detection Methods of Static Eccentricity for Interior Permanent Magnet Synchronous Machine

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