PWM inverters producing torsional components in AC motors

Author

Kerkman, Russel J. ; Theisen, Jeff ; Shah, Kirti

Author_Institution

Rockwell Autom., Mequon, WI

fYear

2008

fDate

22-24 Sept. 2008

Firstpage

1

Lastpage

9

Abstract

Voltage source adjustable frequency drives produce voltage spectra capable of exciting torsional components within the bandwidth of a loadpsilas criticals. If not damped, a motorpsilas torsional spectrum may excite the mechanicalpsilas resonant frequencies destroying fan blades or fail couplings and shafts. This paper reports on an oil refinerypsilas induced draft fanpsilas coupling and drive motorpsilas shaft failures. Field torsional data, mechanical and drive models with analyses and simulation data are presented identifying contributing factors. The paper also presents a solution with installation data showing the improvement.

Keywords

AC motor drives; PWM invertors; fans; oil refining; petroleum industry; shafts; variable speed drives; AC motor shaft; PWM inverters; draft fan coupling; field torsional data; oil refinery; torsional component excitation; voltage source adjustable frequency drives; AC motors; Bandwidth; Blades; Couplings; Data analysis; Oil refineries; Pulse width modulation inverters; Resonant frequency; Shafts; Voltage; Adjustable Frequency Drive (AFD); Pulse Width Modulation (PWM); dead time; dynamic torque; mechanical modeling; modulation; modulation index; torsional torques;

fLanguage

English

Publisher

ieee

Conference_Titel

Petroleum and Chemical Industry Technical Conference, 2008. PCIC 2008. 55th IEEE

Conference_Location

Cincinnati, OH

ISSN

0090-3507

Print_ISBN

978-1-4244-2520-4

Electronic_ISBN

0090-3507

Type

conf

DOI

10.1109/PCICON.2008.4663990

Filename

4663990