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Title: | ACOUSTIC NOISE ANALYSIS, MEASUREMENT, AND CHARACTERIZATION IN ELECTRIC MOTOR DRIVES |
Authors: | Masoumi, Moien |
Advisor: | Bilgin, Berker |
Department: | Electrical Engineering |
Publication Date: | 2024 |
Abstract: | The surge in electrification has led to greater utilization of electric motors in applications where noise reduction is critical, such as electric vehicles, residential appliances, and medical equipment. Consequently, developing motors that ensure lower acoustic noise generation is essential. Proper noise measurement and analysis are vital prerequisites for reducing acoustic noise in electric motors. Accurate noise measurement allows engineers and manufacturers to assess and validate the acoustic performance of electric motors, ensuring compliance with noise standards. It enables them to identify potential noise sources, develop effective noise control strategies, and refine motor designs for quieter operation. After discussing the fundamentals of acoustic noise modeling and measurement, an in-depth investigation into the harmonic content of the radial force and vibroacoustic characteristics of three different motor topologies is performed. The radial force density waveforms are explored, and the dominant radial force harmonics are identified, followed by presenting a pattern for each motor’s dominant radial force harmonics. Then, the correlation between these harmonics and peak points in the sound pressure level of the motors is investigated. A new transportable microphone holding fixture is designed and manufactured, and a setup is developed for the acoustic noise characterization of electric motors. The details of the hardware and software setup are discussed, and the setup is utilized to characterize the acoustic noise of three different electric motors. First, the setup is used in the acoustic noise characterization of an IPM motor by measuring the sound intensity and calculating the motor’s sound power. Then, the acoustic noise characteristics of a 12/8 SRM are studied. The motor is tested at various speed points and load torque values. Two different current control methods are employed for the experiments: a hysteresis controller with a variable switching frequency of up to 20 kHz, and a PWM controller with a switching frequency of 12.5 kHz. Various acoustic noise characteristics are calculated for different operating points, and the results for the two controllers are discussed and compared. Finally, the acoustic noise characteristics of an industrial SRM designed for a wind turbine pitch angle control application are studied. The motor is tested under various speed points and load torque values. The control method employed for the experiments is PWM current control with a switching frequency of 12.5 kHz. The effects of speed variations and loading on various characteristics of the motor’s acoustic noise, such as sound power level and sound quality metrics, are analyzed. |
URI: | http://hdl.handle.net/11375/30346 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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masoumi_moien_202409_PhD.pdf | 7.26 MB | Adobe PDF | View/Open |
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