Analysis of Vibration and Noise for Different Skewed Slot-Type Squirrel-Cage Induction Motors

Wang, Chunyu; Bao, Xiaohua; Xu, Shuangxi; Zhou, Yang; Xu, Wei; Chen, Yuanyang

doi:10.1109/tmag.2017.2704038

Cited by 43 publications

(20 citation statements)

References 10 publications

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“…To define the air-gap flux density more accurately, the 2-D fast Fourier transform is applied in this paper. It has been widely used in the vibration analysis of electrical machines [19]. In fact, the air-gap flux density has both time-dependent and spatial properties, which means that they are determined both by frequency and order.…”

Section: B Air-gap Harmonic Analysis At the Nominal Loadmentioning

confidence: 99%

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Petrov

Pyrhönen

2019

IEEE Access

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High-speed induction machines equipped with a solid steel rotor are capable of achieving a high-rotating speed than other types of machines, because of their simpler and more robust rotor structure. At the same time, however, the eddy-current losses in the solid rotor may be critical, because of the high conductivity of the rotor material, which makes it easy for axial eddy currents to travel in the solid rotor. To efficiently mitigate the rotor eddy-current losses, it is important to accurately determine the rotor eddycurrent losses induced by a particular harmonic in advance. In this paper, an improved virtual permanent magnet harmonic machine (VPMHM) model equipped with a sinusoidally magnetized virtual magnet based on the finite element method (FEM) is proposed for determination of the rotor eddy-current harmonic losses. The 2-D fast Fourier transform was used to accurately analyze the time-spatial air-gap flux density harmonics. The VPMHM model was enhanced to ensure that it was able to exactly produce the required flux density harmonics in the air gap. Two algorithms for the improved VPMHM models with different hybrid excitations were proposed to determine the harmonic losses together with the other important harmonic behavior. The model was further investigated to separate the electromagnetic transients from different harmonics. Finally, the simulation time for the harmonic losses required by the enhanced VPMHM model was significantly reduced by separating the harmonic transients. All the results and conclusions presented in this paper are based on the FEM analysis. INDEX TERMS Solid-rotor high-speed induction machine (IM), finite element method (FEM), 2-D fast Fourier transform, eddy-current losses, improved virtual permanent magnet harmonic machine (VPMHM).

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Section: B Air-gap Harmonic Analysis At the Nominal Loadmentioning

confidence: 99%

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Petrov

Pyrhönen

2019

IEEE Access

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“…The real and imaginary parts are the axial and tangential magnetic flux density of the AFWM, respectively. (10) The PMs of the AFWM are fan-shaped, namely the polar-arc coefficients are equal at different radii. Therefore, the magnetic flux density is almost identical along the radial direction theoretically.…”

Section: Air-gap Magnetic Fieldmentioning

confidence: 99%

“…The structure-side methods are based on the optimisation of the stator structure parameters to change the model frequency and avoid resonance [5,6]. While for the excitation-side methods, many efforts have focused on reducing the amplitude of electromagnetic force by optimising electromagnetic parameters, skewing the slots, and magnets or injecting harmonic current, so as to achieve the purpose of vibration and noise reduction [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Noise reduction of axial‐flux motors by combining various pole‐arc coefficients and circumferential shifting of permanent magnets: analytical approach

Deng

Zuo

2019

IET Electric Power Applications

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The electromagnetic noise of an axial-flux in-wheel motor (AFWM) is reduced by combining various pole-arc coefficients and circumferential shifting of permanent magnets (PMs) here. First, the analytical model of the air-gap magnetic field for the AFWM with various pole-arc coefficients and circumferential shifting of PMs is established. The influence of edging effect and stator slotting is taken into account through the radial correction function and complex relative permeance function, respectively. Subsequently, the torque and electromagnetic noise of the AFWM are derived analytically. A multi-objective optimisation of the AFWM is then implemented by the NSGA-II (non-dominated sorting genetic algorithm) based on the proposed analytical approach. Finally, the electromagnetic performance and vibroacoustic characteristics of the initial and optimised motors are compared and analysed. The results show that the proposed method by combining various pole-arc coefficients and circumferential shifting of PMs can reduce the noise of axial-flux motors effectively, without sacrificing the output torque. This study is of great significance for the vibration and noise reduction of axial-flux motors.

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“…The air-gap magnetic flux density wave of the induction motor generates radial and tangential electromagnetic excitation forces on the stator core teeth. The radial component, which makes the stator core vibrate and deform, is the main source of electromagnetic noise [8][9][10] .…”

Section: Introduction1mentioning

confidence: 99%

“…The authors in [14] examined the influence of slot-combinations on the flux and force pulsations. Novel methods were proposed in [8,[15][16][17] to reduce the vibration and noise of induction motors by changing the skew slot structure of the rotor to weaken the harmonic amplitude of the rotor teeth. However, there are several side effects when equipped with skewed slot [15] , such as axial drifting and transverse current.…”

Section: Introduction1mentioning

confidence: 99%

Analysis of vibration and noise of induction motor equipped with concentric single-double-layer star-delta winding

Bao

2019

Chin. J. Electr. Eng.

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Compared with changing the structure of a motor that has been manufactured, changing the type of stator winding is an economical and time-saving method to reduce the vibration and noise. Thus, a concentric single-double-layer star-delta (CSDLSD) winding for an induction motor is described in this paper with the aim of reducing the noise of the motor. By planning the turns relationship between the two parts of the winding, the harmonic component of the air-gap magnetic field can be decreased. Besides this, through adjusting the turns ratio in each slot of concentric winding per phase respectively, the waveform of the air-gap magnetic field becomes closer to a sinusoidal type. Three motors equipped with the CSDLSD winding and another two types of stator winding were analyzed. The theoretical analysis and the two-dimensional finite element method (2D-FEM) were combined to study the relationship between the harmonics of the air-gap magnetic field and the stator winding. Finally, a 2D fast Fourier transformation (2D-FFT) method was used to obtain the time-frequency spectrum of the air-gap flux density and electromagnetic excitation force, and compared with a natural vibration wave. The noise distribution was obtained using the harmonic response. The results of the theoretical analysis, 2D-FEM, 2D-FFT, and harmonic response corroborate each other such that the motor applying CSDLSD winding could reduce both the vibration and noise.

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Analysis of Vibration and Noise for Different Skewed Slot-Type Squirrel-Cage Induction Motors

Cited by 43 publications

References 10 publications

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Noise reduction of axial‐flux motors by combining various pole‐arc coefficients and circumferential shifting of permanent magnets: analytical approach

Analysis of vibration and noise of induction motor equipped with concentric single-double-layer star-delta winding

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