Title :
PWM inverters producing torsional components in AC motors
Author :
Kerkman, Russel J. ; Theisen, Jeff ; Shah, Kirti
Author_Institution :
Rockwell Autom., Mequon, WI
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;
Conference_Titel :
Petroleum and Chemical Industry Technical Conference, 2008. PCIC 2008. 55th IEEE
Conference_Location :
Cincinnati, OH
Print_ISBN :
978-1-4244-2520-4
Electronic_ISBN :
0090-3507
DOI :
10.1109/PCICON.2008.4663990
