Noise Source Identification of Small Fan-BLDC Motor System for Refrigerators

Kim, Yong-Han; Yang, Bo-Suk; Kim, Chang-Joon

doi:https://doi.org/10.1155/IJRM/2006/63214

International Journal of Rotating Machinery

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Volume 2006 | Article ID 063214 | https://doi.org/10.1155/IJRM/2006/63214

Noise Source Identification of Small Fan-BLDC Motor System for Refrigerators

Yong-Han Kim,¹Bo-Suk Yang,²and Chang-Joon Kim³

Received01 Jun 2006

Revised04 Sept 2006

Accepted06 Sept 2006

Published13 Nov 2006

Abstract

Noise levels in household appliances are increasingly attracting attention from manufacturers and customers. Legislation is becoming more severe on acceptable noise levels and low noise is a major marketing point for many products. The latest trend in the refrigerator manufacturing industry is to use brushless DC (BLDC) motors instead of induction motors in order to reduce energy consumption and noise radiation. However, cogging torque from BLDC motor is an undesirable effect that prevents the smooth rotation of the rotor and results in noise. This paper presents a practical approach for identifying the source of excessive noise in the small fan-motor system for household refrigerators. The source is presumed to a mechanical resonance excited by torque ripple of the BLDC motor. By using finite element analysis, natural frequencies and mode shapes of the rotating part of the system are obtained and they are compared with experimental mode shapes obtained by electronic torsional excitation test which uses BLDC motor itself as an exciter. Two experimental validations are carried out to confirm the reduction of excessive noise.

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Copyright

Copyright © 2006 Yong-Han Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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