The influence of the skewed rotor slots on the magnetic noise of three-phase induction motors

Nau, Sebastião Lauro

doi:10.1049/cp:19971106

Cited by 22 publications

(12 citation statements)

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“…In [9] authors state that "severe airgap eccentricity (over 25%) will contribute 2 to 3 dB(A) to the overall noise level of the machine". In [10] analytical calculations and experimental results also show the influence of the eccentricity on the acoustic noise generated by a three-phase induction motor.…”

Section: Evaluation Of Static Eccentricitymentioning

confidence: 91%

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Detection and analysis of rotor faults in induction motors by the measurement of the stray magnetic flux

Rigoni

Sadowski

Batistela

et al. 2012

J. Microw. Optoelectron. Electromagn. Appl.

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Section: Evaluation Of Static Eccentricitymentioning

confidence: 91%

“…5). In this work also Finite Element field calculations are employed instead of the analytical calculations presented in [10] in the theoretical analysis of the defects. Solely the static eccentricity is here considered.…”

Section: Evaluation Of Static Eccentricitymentioning

confidence: 99%

Detection and analysis of rotor faults in induction motors by the measurement of the stray magnetic flux

Rigoni

Sadowski

Batistela

et al. 2012

J. Microw. Optoelectron. Electromagn. Appl.

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“…Nau S.L., in his investigations has shown the clear influence of skewed rotor slots on magnetic noise which decreases when skew is increased within the limit defined by the performance characteristic of the motor [2]. However, newer rotor designs, employing modulated slots can give reduced noise level in the motor, thereby eliminating skew.…”

Section: Introductionmentioning

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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“…It offers various advantages over other machines such as reduced unit cost, brushless rotor (squirrel cage construction), absence of separate DC source and ease of maintenance. Numerous papers have attempted to analyze the SEIG using equivalent circuit approach [1][2][3][5][6][7]. Generally two different (but related) methods of capacitance solution for voltage build-up and terminal voltage regulation have been employed, namely, the loop impedance method and nodal admittance method.…”

Section: Introductionmentioning

confidence: 99%

“…This causes the fundamental component of the rotating flux wave to appear smaller, that is, with a reduction in the rotor voltage. As shown in equation (1), the rotor voltage is reduced by a factor equal to the skew factor ( Ksk ) [3]. …”

Section: Introductionmentioning

confidence: 99%

Investigation of skew effect on the Performance of Self - Excited Induction Generators

Sawetsakulanond

Kinnares

2007

2007 7th International Conference on Power Electronics and Drive Systems

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This paper presents the investigation of skew effects on the performance of three phase, 2.2 kW 220/380 volt 4 poles self -excited induction generators (SEIG) with skewed squirrel cage rotor. Analysis of excitation capacitor of the SEIG based on a steady -state equivalent circuit model including rotor skew effect is given. Skewed rotor with angle of 00 , 5 0, and 10 I for the SEIG are employed.Testing and performance comparison under dynamic and steady -state operation with resistive and resistiveinductive loads have been performed. Results can be guidelines for development of effective wind induction generators.

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The influence of the skewed rotor slots on the magnetic noise of three-phase induction motors

Cited by 22 publications

References 0 publications

Detection and analysis of rotor faults in induction motors by the measurement of the stray magnetic flux

Detection and analysis of rotor faults in induction motors by the measurement of the stray magnetic flux

Design and analysis of asymmetrical rotor for induction motors

Investigation of skew effect on the Performance of Self - Excited Induction Generators

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