Forces and vibrations analysis in industrial PM motors having concentric windings

Cassat, A.; Espanet, Christophe; Coleman, Robert P.; Leleu, Emmanuel; Burdet, L.; Torregrossa, Dimitri; M'Boua, J.; Miraoui, Abdellatif

doi:10.1109/ecce.2010.5618070

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…3(a), a few harmonic components have relatively large amplitude and need to be considered in the equation above. Therefore, the amplitude of the 4th harmonic order in (9) can be simplified as…”

Section: B Analysis Of Force Densitymentioning

confidence: 99%

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Slot Harmonic Effect on Magnetic Forces and Vibration in Low-Speed Permanent-Magnet Machine With Concentrated Windings

Valavi

Nysveen

Nilssen

et al. 2014

IEEE Trans. on Ind. Applicat.

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In this paper, the influence of slot harmonics on magnetic forces and vibration is studied in a 120-slot/116-pole low-speed PM machine at no-load. It is shown how the lowest mode of vibration is produced at no-load due to slotting. Comparing the cases of open slots, semi-closed slots and magnetic wedges, the effect of slot closure on radial forces and torque production capability is discussed. Magnetic flux distribution in the airgap is computed using finite element analysis. Spatial harmonics due to slotting are investigated in different cases. Maxwell's stress tensor is employed to calculate radial and tangential components of the force density in the airgap. Spatial distribution of the total forces on the teeth and also time-dependent force waveform on one tooth are analyzed and discussed for different cases. It is shown how the magnitude of the lowest mode of vibration is reduced in the case of using semi-closed slots and magnetic wedges. Tangential force density distribution and torque production capability are also discussed. Structural analysis is presented to compute the maximum amplitude of the stator deformations due to the radial forces. Experimental results of the prototype generator are presented verifying the existence of the lowest mode of vibration at no-load because of the slot harmonics.

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Section: B Analysis Of Force Densitymentioning

confidence: 99%

“…In [8], the authors investigated the characteristics of the radial magnetic forces in a 12-slot/10-pole machine. In [9], the authors examined the radial forces and vibration in a 48-slot/44-pole machine. In [10], an analytical method is developed for analyzing the radial forces for fractional slot PM machines.…”

mentioning

confidence: 99%

Slot Harmonic Effect on Magnetic Forces and Vibration in Low-Speed Permanent-Magnet Machine With Concentrated Windings

Valavi

Nysveen

Nilssen

et al. 2014

IEEE Trans. on Ind. Applicat.

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show abstract

“…In the design process of squirrel-cage induction motors, in order to assure a reduced noise level of the motor, the designers have to take into account the electromagnetic, mechanical and acoustic phenomena that contribute to the production of noise [1, 2,3]. In this paper, the purpose is to study the influence of the type of winding [3,4] -double layer or single layer -to the global noise level of the machine. These numerical methods must be integrated in the fabrication process for testing, verifying and validating different solutions offered by the designer of electrical machines [5].…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the winding type influence on the noise level of two-speed three-phase induction motors

Ionescu¹,

Munteanu

2014

2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

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The goal of this work is to present the study of the influence of the winding -double layer or single layer -to the global noise level of an induction motor. For this purpose, two variable speed induction motors have been studied, of the type M3AA 71 B2/4 manufactured by Electroprecizia S.A. Săcele, Romania, with Dahlander windings, star connected -for the low speed and double star connected -for the high speed. The motors are modelled from magnetic and mechanical point of view with finite element softwares. The noise-to-frequency characteristics have been determined by investigations in a semianechoic chamber.

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“…However, researches have been specifically dedicated to outer-rotor PMSMs and the corresponding radial electromagnetic force density is derived in rotor rotational reference [24]- [26]. Alternatively, the resultant magnetic forces acted on stator teeth, instead of radial electromagnetic force density, are employed to predict the electromagnetic vibration characteristics of both SPMSMs [27], [28] and IPMSMs [29], [30]. Similarly, various analytical [5], [7], [14], [20] and FEA [16]- [18], [28], [30]- [32] methods are widely adopted to calculate the radial electromagnetic force associated vibration in PMSMs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of radial electromagnetic force density and vibration in a fractional-slot interior permanent magnet synchronous machine

Fei

Luk

2013

2013 IEEE Energy Conversion Congress and Exposition

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This paper investigates the radial electromagnetic force density and the associated vibration of an interior permanent magnet synchronous machine (IPMSM) with fractional-slot concentrated winding (FSCW) configuration. Interactions between magneto-motive force (MMF) harmonics, stator slotting effect, and rotor saliency effect will generate various air-gap magnetic field components, as well as radial electromagnetic force density harmonics. To develop an efficient yet realistic mechanism for the understanding of the force and vibration issues of the IPMSM under study, a combination of static two-dimensional (2-D) finite element analysis (FEA) and analytical methods is used to model the low order spatial harmonics of the machine's radial electromagnetic force density. The validity of the proposed approach is confirmed by the results from the high fidelity comprehensive transient 2-D FEA and 2-D fast Fourier transformation (FFT) methods. Moreover, comprehensive mechanical FEA are employed to carry out free and forced vibration investigations of the machine, which are verified by the experimental results.

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Forces and vibrations analysis in industrial PM motors having concentric windings

Cited by 12 publications

References 8 publications

Slot Harmonic Effect on Magnetic Forces and Vibration in Low-Speed Permanent-Magnet Machine With Concentrated Windings

Slot Harmonic Effect on Magnetic Forces and Vibration in Low-Speed Permanent-Magnet Machine With Concentrated Windings

A comparative study of the winding type influence on the noise level of two-speed three-phase induction motors

Investigation of radial electromagnetic force density and vibration in a fractional-slot interior permanent magnet synchronous machine

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