Study of the Combined Effects of the Air-Gap Transfer for Maxwell Tensor and the Tooth Mechanical Modulation in Electrical Machines

Pile, Raphaël; Menach, Yvonnick Le; Besnerais, Jean Le; Parent, Guillaume

doi:10.1109/tmag.2019.2948228

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…This result is a generalization of the simplified coefficients which were found in ref. [34] (36) and (37) with the wavenumber n and the adimensional radius r. In particular, Figure 6 highlights that:…”

Section: Discussionmentioning

confidence: 98%

“…The main contribution of the study is to demonstrate the AGSF transfer law proposed in ref. [37]. This study also discusses the physical interpretation of this transfer law and its application to the vibroacoustic study of electrical machines.…”

Section: Introductionmentioning

confidence: 95%

“…A new analytic transfer law (45) was introduced in ref. [37], which allows us to compute the AGSF at the stator teeth tip radiusor stator bore radiusbased on the AGSF in the middle of the air gap. This transfer law is a generalization of the solution proposed in ref.…”

Section: Introductionmentioning

confidence: 99%

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Analytical study of air-gap surface force – application to electrical machines

Pile

Besnerais²,

Parent

et al. 2020

Open Physics

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The Maxwell stress tensor (MST) method is commonly used to accurately compute the global efforts, such as electromagnetic torque ripple and unbalanced electromagnetic forces in electrical machines. The MST has been extended to the estimation of local magnetic surface force for the vibroacoustic design of electrical machines under electromagnetic excitation. In particular, one common air-gap surface force (AGSF) method based on MST is to compute magnetic surface forces on a cylindrical shell in the air gap. However, the AGSF distribution depends on the radius of the cylindrical shell. The main contribution of this study is to demonstrate an analytic transfer law of the AGSF between the air gap and the stator bore radius. It allows us to quantify the error between the magnetic surface force calculated in the middle of the air gap and the magnetic force computed on the stator teeth. This study shows the strong influence of the transfer law on the computed tangential surface force distribution through numerical applications with induction and synchronous electrical machines. Finally, the surface force density at stator bore radius is more accurately estimated when applying the new transfer law on the AGSF.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 95%

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Analytical study of air-gap surface force – application to electrical machines

Pile

Besnerais²,

Parent

et al. 2020

Open Physics

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“…A 40/30 slot, four poles, and an FSCIM are used to study the influence of saturation on the air-gap flux density waveform [14]. Wang Dong et al selected three five-phase motors with 60/38 slots to form a fifteen-phase induction motor, and analyzed the air-gap magnetic potential of the induction motor under non-sinusoidal power supply conditions [15]. A comparative analysis of the operating characteristics between the three-phase and fivephase induction motors under the same structural size, that is, 30/44 slots and 2-poles induction motor, is discussed in [16].…”

Section: Introductionmentioning

confidence: 99%

An Improved Model for Five-Phase Induction Motor Based on Magnetic Noise Reduction Part II: Pole-Slot Scheme

et al. 2022

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For the reduction in the electromagnetic noise level of three-phase induction motors, many empirical rules and analytical models have been established to select the matching scheme of pole and slot, but they are not fully applicable to five-phase squirrel cage induction motors (FSCIM). In this paper, combined with the slot-number phase diagram (SNPD), and the electromagnetic force-vibration-acoustic analytical model deduced in Part I, the influence of pole-slot schemes, including five-phase regular-size phase-belt and fractional-slot winding, on magnetic noise is analyzed. The feasibility of electromagnetic noise prediction is verified by finite element simulation and experiments. Taking a 4 kW FSCIM as a prototype, noise prediction is carried out for all the slot-number matching schemes with pole pairs not exceeding three. For two noise reduction targets, which reduce the maximum single-frequency noise in the steady-state operation and the average noise during startup, the pole-slot numbers matching rule of FSCIM is given. This improved model is also applicable in different power ranges for the noise reduction design of five-phase motors.

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“…When the power level of these sounds exceeds a set threshold, they become noise. The constant striving to achieve more power and torque in motors with unchanged mass and to increase electromechanical parameters [25][26][27][28] involves the increasing use of active parts of the motor. As a result, the forces acting on the individual components of the motor are also increasing while the structure itself is becoming more susceptible to deformation, thus increasing the level of generated noise [24].…”

mentioning

confidence: 99%

Identification and Analysis of Noise Sources of Permanent Magnet Synchronous Traction Motor with Interior Permanent Magnet

Król,

Maciążek

2023

Energies

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The rapid development of electromobility is placing ever higher demands on new electric motor designs. This results in a gradual reduction in weight with a simultaneous increase in maximum torque. As a result, unfavorable phenomena, such as vibration and noise, can become apparent in the drivetrain. Modeling and evaluation of the acoustic noise sources of a traction motor are particularly important when it is used, for example, as the traction drive of an electric bus, where too high noise levels can have a negative impact on passengers. This article describes methods for analyzing and evaluating the root causes of noise that occurs in permanent magnet traction motors with a rotor in which the magnets have been placed inside the rotor (PMSM IPM). This paper presents an analysis of acoustic noise and forces acting in the air gap of a 240 kW motor with 60 stator slots and 2p = 10 (s60p20) as the number of pole pairs designed for bus and truck drives. To determine the dominant noise sources and evaluate their value, the forces acting in the air gap and their effect on the deflection of the outer surface of the stator yoke were calculated. The natural frequencies of the machine, their frequencies for the entire rotor speed range, and the frequency of vibration of the motor stator were calculated. Based on these data, the sound power level (A-SWL) was calculated at varying motor speeds. MANATEE software (EOMYS, 9, avenue de la Créativité, 59650 Villeneuve d’Ascq—FRANCE) from EOMYS was used to perform vibroacoustic calculations. The analysis results were also subjected to verification on a laboratory bench.

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Study of the Combined Effects of the Air-Gap Transfer for Maxwell Tensor and the Tooth Mechanical Modulation in Electrical Machines

Cited by 9 publications

References 6 publications

Analytical study of air-gap surface force – application to electrical machines

Analytical study of air-gap surface force – application to electrical machines

An Improved Model for Five-Phase Induction Motor Based on Magnetic Noise Reduction Part II: Pole-Slot Scheme

Identification and Analysis of Noise Sources of Permanent Magnet Synchronous Traction Motor with Interior Permanent Magnet

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