Masters Theses
Abstract
"Noise of claw pole alternators, generated electromagnetically and structurally radiated, has been the subject of an extensive research program. The goal has been to identify and reduce noise radiation mechanisms in claw pole (Lundell) alternators used in automotive applications. The study reported here has investigated machine and mount response to electromagnetically generated torque ripple. Modeling and experimentation has led to the conclusion that there exists a high correlation between electromagnetic sources, torque ripple, and radiated noise. Experimentation also has led to the conclusion that noise characteristics of a given machine are substantially altered by modification of the mounting configuration. The work reported here involves modeling, simulation, and experiment to isolate machine dynamic characteristics and mounting geometries which contribute to strong coupling between torque ripple and machine/mount dynamic response. A low order model of the alternator which includes shaft flexibility, gyroscopic effects, shaft bearing asymmetry, mounting lug geometry, and mounting structure dynamics has been created. The model provides a rapid simulation of dynamic response in the form of a transfer function between torque ripple and mounting forces. Electromagnetic modeling and dynamic response simulations suggest that the six phase machine is inherently quieter. This is supported by experimental results. A test fixture for the measurement of torque ripple has been developed. Experimentation shows that the relative amplitudes of torque ripple in three and six phase machines correlates with relative noise levels. In addition, in torque ripple measurements, machine mounting characteristics are substantially altered and a predictably large reduction in radiated noise is realized"--Abstract, page iv.
Advisor(s)
Eversman, Walter
Committee Member(s)
Dharani, Lokeswarappa R.
Crow, Mariesa
Department(s)
Mechanical and Aerospace Engineering
Degree Name
M.S. in Mechanical Engineering
Publisher
University of Missouri--Rolla
Publication Date
Spring 2004
Pagination
ix, 54 pages
Note about bibliography
Includes bibliographical references (page 38).
Rights
© 2004 Steven Jonathan Burns, All rights reserved.
Document Type
Thesis - Restricted Access
File Type
text
Language
English
Subject Headings
Automobiles -- Electric generators -- Design and constructionAutomobiles -- NoiseNoise control
Thesis Number
T 8511
Print OCLC #
56586277
Recommended Citation
Burns, Steven Jonathan, "Noise generation mechanisms in claw pole alternators" (2004). Masters Theses. 2520.
https://scholarsmine.mst.edu/masters_theses/2520
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Comments
Financial support has been provided by Delphi Automotive Systems, as well as the Integrative Graduate Education and Research Training (IGERT) program, which is funded by the National Science Foundation.