NDLI: VFD Machinery Vibration Fatigue Life and Multilevel Inverter Effect

Content Provider	IEEE Xplore Digital Library
Author	Xu Han Palazzolo, A.B.
Copyright Year	1972
Abstract	This paper documents fatigue-related mechanical failures in variable-frequency drive (VFD) motor machinery due to mechanical vibrations excited by drive torque harmonics which are created by pulse width modulation (PWM) switching. Present effort models the coupled system with a full electrical system (including the rectifier, dc bus, inverter, and motor), and an industrial mechanical system (including flexible couplings, gearboxes, and multiple inertias). The models are formed by a novel combination of a commercial motor code with a general self-written mechanical code. The approach extends failure prediction beyond the simple occurrence of resonance to fatigue life evaluation based on the rain-flow algorithm, which is suitable for both steady state and transient start-up mechanical response. The second contribution is a demonstration that the common use of a multilevel inverter to reduce voltage/current harmonics may actually exacerbate resonance and fatigue failure. This is shown to be caused by a resulting amplitude increase of torque components in proximity to potential resonance frequencies.
Sponsorship	IEEE Industry Applications Society
Starting Page	2562
Ending Page	2575
Page Count	14
File Size	2554314
File Format	PDF
ISSN	00939994
Volume Number	49
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stress Torque Harmonic analysis Inverters Couplings Machinery Damping vibration Fatigue rain-flow variable-frequency drive (VFD)
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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