Comparison of PWM and PFM induction drives ID in,egarding audible noise and vibration for household applications

Date

2004-11-01

Author

Ertan, Hulusi Bülent

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This paper is aimed at comparing the performance of pulse frequency modulation (PFM) and pulsewidth modulation (PWM) techniques regarding audible noise generated from inverter-driven induction motors. For the purpose of illustrating the performance of the two modulation techniques, a drive developed for washing machine applications is considered. First, the measured and simulated harmonic content of this inverter is compared with the measured harmonic spectrum of a three-phase input-output commercial variable-frequency inverter. It is found that despite the 8-bit processor inexpensive implementation, the total harmonic. distortion (THD) of PFM is comparable to the THD of MAIM in more sophisticated applications. It is discovered that the harmonic spectrum of PFM exhibits harmonics of smaller magnitude distributed over 0.9f(o)-2.1f(o) (base switching frequency) range, as opposed to a smaller number of dominant harmonics of PWM. Next, the prototype drive is programmed to generate both sine-PWM and PFM waveforms. The motor is driven at several frequencies and the audible noise and vibration level of the motor is measured. It is observed that the type of current harmonic content of PFM leads to reduced noise and vibration.

Subject Keywords

Acoustic noise, Induction drive, inverters, Modulation, Vibration

URI

https://hdl.handle.net/11511/30416

Journal

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS

DOI

https://doi.org/10.1109/tia.2004.836316

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

H. B. Ertan, “Comparison of PWM and PFM induction drives ID in,egarding audible noise and vibration for household applications,” IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, pp. 1621–1628, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30416.