Effects of slot combination on acoustic noise from induction motors

Kobayashi, Takashi; Tajima, Fumio; Ito, M.; Shibukawa, Suetarou

doi:10.1109/20.582736

Cited by 62 publications

(28 citation statements)

References 4 publications

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“…With regard to the time order, the medium to high range (1 kHz to 3 kHz) is where auditory problems occur [18,19]. Thus, in this paper we attempt to reduce vibration by focusing on these points.…”

Section: Analysis Conditions and Methodsmentioning

confidence: 99%

Reduction of Vibration in Concentrated Winding Permanent Magnet Synchronous Motor by Means of Skew Effects of Rotor

Takahata

Wakui

Miyata

et al. 2014

Electrical Engineering Japan

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SUMMARYGlobal warming and the problem of successfully incorporating environmental safeguards are promoting the need for a more power-efficient motor. Therefore, as a driving source, permanent magnet synchronous motors (PMSMs) with concentrated winding are widely used in a variety of fields. However, a PMSM with a concentrated winding generates more vibration than one with a distributed winding because of the radial electromagnetic force. This paper describes the effect of a new skewed rotor on the characteristics of a concentrated winding PMSM. We investigated this effect by three-dimensional finite element method (3D FEM) analysis and measurement. We also demonstrate that the proposed rotor is effective in reducing the radial electromagnetic force without decreasing motor efficiency. C⃝ 2014 Wiley Periodicals, Inc. Electr Eng Jpn, 187(2): 33-43, 2014; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Section: Analysis Conditions and Methodsmentioning

confidence: 99%

Reduction of Vibration in Concentrated Winding Permanent Magnet Synchronous Motor by Means of Skew Effects of Rotor

Takahata

Wakui

Miyata

et al. 2014

Electrical Engineering Japan

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“…Different spectral methods could be implemented to analyze the data obtained from FEM as described in [8]. Some interesting results of such implementations have been reported in [9] and [10]. However a much detail representation could be obtained by employing 2D spectral analysis as shown in the Fig.9.…”

Section: A Fem Validation For Standard Equi-pitched Rotor Slotsmentioning

confidence: 99%

Design and analysis of asymmetrical rotor for induction motors

Chitroju

Sadarangani

2008

2008 18th International Conference on Electrical Machines

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Increase of stray losses in the skewed rotor is mainly due to the cross-currents flowing from the conductor into the laminations. These losses are strongly related to the contact resistance between the bar and the laminations which depends on several factors including the casting process. A substantial reduction of cross-current losses can be achieved by changing or removing skew and by employing various slot combinations. Skew removal will cause some parasitic effects such as increase in the noise level and undesirable dips in the starting torque characteristics. To minimize these effects the rotor design needs to be modified and this could be achieved by introducing modulated slots. Two such types of modulated rotor slot designs are proposed in this paper. As a first step in the performance analysis, magnetic forces, which are the major sources of noise and vibration excitations, is considered. In order to study the newly proposed modulated slot designs, a spectral method is employed and analytically calculated electromagnetic forces are validated against FEM results. The analyses shows that the proposed new designs have better force characteristics compared to the conventional design, which illustrate the fact that better performance characteristics can be achieved by removing skew and introducing modulated slots.

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“…Stator and rotor harmonics spectrum should be calcul-ated and listed when anlysising order time and frequency of Radial force for different slot combination [4] [5] The data in tables below is calculated in the classic formula,which is the number of low-order force wave and the corresponding frequency of different slot combination.These tables can be to made the theoretical data reference for later analysis of the radial electromagnetic force [6] [7] . …”

Section: Theoretical Analysis Of the Radial Electromagnetic Forcementioning

confidence: 99%

“…Previous theories about slot combination may not be able t o meet the requirements of manufacturing now. Therefore, it' s necessary to make a further study on influence of different motor slot coordination to the vibration noise under the condit ion of the inverter power supply [4] [6] .…”

Section: Introductionmentioning

confidence: 99%

Research on the radial electromagnetic force of inverter-fed induction machine with different slot combination using FEM

Hengyu

Ruan

Liu

et al. 2014

2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

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Electromagnetic vibration is one of the vital factor causing noise and vibration of induction machine, especially in inverter supply. For inverter-fed induction machine, higher harmonic in stator current will worsen the electromagnetic noise and vibration. In this paper, a 2-D field-circuit coupling analysis by time-stepping finite element method (FEM) is conducted to get the radial electromagnetic forces in different slot combination. It focuses on the order and the frequency spectrum characteristics of radial electromagnetic force through the fft result in time and space domain. After the comprehensive analysis ， it provides a proper kind of slot combination of inverter-fed motor to guide the industrial design

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Effects of slot combination on acoustic noise from induction motors

Cited by 62 publications

References 4 publications

Reduction of Vibration in Concentrated Winding Permanent Magnet Synchronous Motor by Means of Skew Effects of Rotor

Reduction of Vibration in Concentrated Winding Permanent Magnet Synchronous Motor by Means of Skew Effects of Rotor

Design and analysis of asymmetrical rotor for induction motors

Research on the radial electromagnetic force of inverter-fed induction machine with different slot combination using FEM

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