Noise Source Identification of Small Fan-BLDC Motor System for Refrigerators
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 industr...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2006-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/IJRM/2006/63214 |
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| Summary: | 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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| ISSN: | 1023-621X 1542-3034 |