A Study on the Characteristic of Noise and Vibration in 3-phase Induction Motor for the Forklift

ABSTRACT This paper presents the reduction of acoustic noise generated by electromagnetic force in an induction motor of the electrical forklift. After summarizing the electromagnetic excitation forces due to the interaction between the stator/rotor slot permeance and the stator winding magnetomotive force, the effects of the electromagnetic force on the noise and vibration of an induction motor are analyzed. In order to experimentally identify the noise sources of the motor, the signal analyses for noise and vibration are performed by using waterfall plots of noise and vibration spectrums. It is found that severe noise and vibration are caused by the electromagnetic force when the mode number of the excitation shape for a stator is low. Furthermore, it is verified that the motor noise is amplified if the excitation frequency of the electromagnetic force coincides with one of the natural frequencies of the stator. It is experimentally demonstrated that this severe noise can be considerably reduced by structure modifications. Finally, some design guidelines are suggested to develop an induction motor with a low level of noise.

[1]  Jintai Chung,et al.  A Study on Noise Reduction for the Driving System of a Forklift , 2008 .

[2]  S. J. Salon,et al.  Effects of slot closure and magnetic saturation on induction machine behavior , 1994 .

[3]  R. Belmans,et al.  Electro-mechanical analysis of the audible noise of inverter-fed squirrel-cage induction motor , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[4]  R. L. Campbell,et al.  An investigation of induction motor zeroth-order magnetic stresses, vibration, and sound radiation , 2004, IEEE Transactions on Magnetics.

[5]  Y. Sakamoto,et al.  A low noise slotless parametric motor suited for use in quiet environment , 1992 .

[6]  Hi-Sung Lee,et al.  A Safety Assessment and Vibration Characteristics of Railway Vehicle Passing Curves , 2007 .

[7]  L. Timár-P.,et al.  Noise and vibration of electrical machines , 1989 .

[8]  S. J. Yang,et al.  Low-Noise Electrical Motors , 1981 .

[9]  Gwang-Jun Kim,et al.  Analysis on Noise of Automotive Alternator Considering the Number of Stator Slots , 2000 .

[10]  Satoru Sone,et al.  A novel prediction method of acoustic magnetic noise based on induction motor's NHCC function , 1999, IEEE Trans. Ind. Electron..

[11]  Daniel Roger,et al.  Magnetic noise reduction of induction machines , 2003 .

[12]  Xu Wang,et al.  A simple and portable method of in-situ acoustic performance assessment of vehicle carpet systems , 2008 .

[13]  Aldo Canova,et al.  Calculation of slot harmonic effects in induction motors by finite element method , 1995 .

[14]  J. Penman,et al.  Cage Rotor MMF: Winding Function Approach , 2001 .

[15]  R. S. Colby,et al.  Vibration modes and acoustic noise in a four-phase switched reluctance motor , 1995 .

[16]  K.-J. Kim,et al.  Modelling of electromagnetic excitation forces of small induction motor for vibration and noise analysis , 1998 .

[17]  S. L. Nau,et al.  Acoustic noise in induction motors: causes and solutions , 2000, Record of Conference Papers. Industry Applications Society Forty-Seventh Annual Conference. 2000 Petroleum and Chemical Industry Technical Conference (Cat. No.00CH37112).

[18]  Joseph C. S. Lai,et al.  VIBRATION ANALYSIS OF AN INDUCTION MOTOR , 1999 .