Avoiding First Mode Resonance in Rigid-Body-Vibration Mode of Rotors for Small Induction Motors

This paper describes a finite element model for rotor-bearing systems, which has been used to estimate the natural frequency of the rigid-body-vibration mode largely affecting electromagnetic noise in small induction motors. In this model the rotor core is represented by beam elements which have an...

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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series C Vol. 64; no. 625; pp. 3327 - 3332
Main Authors MATSUBARA, Kenichiroh, IDA, Michiaki, OBATA, Takeshi
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 25.09.1998
Subjects
Bearing
Electromagnetic Induced Vibration
Finite Element Method
Identification
Induction Motors
Modelling
Resonance
Rigid-Body-Vibration Mode
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Summary:This paper describes a finite element model for rotor-bearing systems, which has been used to estimate the natural frequency of the rigid-body-vibration mode largely affecting electromagnetic noise in small induction motors. In this model the rotor core is represented by beam elements which have an equivalent value of Young's modulus to the real structure, and the bearings are modeled using spring elements arranged in radial and rotational directions. The bearing stiffnesses in both directions are obtained using an experimental apparatus which can identify the stiffness in each direction. Experimental verification shows that the natural frequency of the mode can be calculated to within 2%, using the values for radial and rotational stiffnesses.
ISSN:0387-5024
1884-8354
DOI:10.1299/kikaic.64.3327