Prediction of Mechanical Shaft Failures Due to Pulsating Torques of Variable-Frequency Drives

Song-Manguelle, Joseph; Schröder, S.; Geyer, Tobias; Ekemb, Gabriel; Nyobe-Yome, J.M.

doi:10.1109/tia.2010.2057397

Cited by 61 publications

(52 citation statements)

References 20 publications

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“…Although this is true and also beneficial from the standpoint of reducing EMI and ohmic losses, it does not guarantee that all components of torque are reduced, and as shown by our example certain harmonics may actually increase as the inverter level increases and further exacerbate a high cycle fatigue problem. A recent publication [16] provides formulas for the torque harmonic frequencies and the relationships between torque and current harmonic frequencies, which are verified by both simulations and tests. Theses authors develop a particularly clever approach for eliminating entire series of torque harmonics by implementing a PWM carrier frequency interleaving on a four-thread VFD.…”

Section: Literature Reviewmentioning

confidence: 75%

“…Both the two-level and multilevel inverters "chop" the input DC voltage at a high-frequency. The chopped voltage/current signal contains many high frequency harmonics which interact with the motor fundamental frequency, resulting in relatively low frequency torque harmonics as given in [16].…”

Section: A Vfd Systemmentioning

confidence: 99%

“…The five-level inverter shear stress is less than the three-level inverter shear stress, but is larger than the two level inverter shear stress. The reason for this is explained based on the torque-current relationship developed in [16] with the assumption that in rotating coordinates the stator and rotator currents are all dominated by large DC components. As stated in [16], the torque harmonic frequencies and current harmonic frequencies can be written as (32) three.…”

Section: Life Predictionmentioning

confidence: 99%

See 2 more Smart Citations

VFD machinery vibration fatigue life and multi-level inverter effect

Han

Palazzolo

2012

2012 IEEE Industry Applications Society Annual Meeting

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The 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 PWM switching. Present effort models the coupled system with full electrical system including rectifier, DC bus, inverter, motor, and an industrial mechanical system including flexible couplings, gearboxes and multiple inertias. The models are formed by a novel combining of a commercial motor code with a general, self-written mechanical code. The approach extends failure prediction beyond simple occurrence of resonance, to fatigue life evaluation based on Rain-flow algorithm, which is suitable for both steady state and transient startup mechanical response. The second contribution is a demonstration that the common use of 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.

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Section: Literature Reviewmentioning

confidence: 75%

Section: A Vfd Systemmentioning

confidence: 99%

Section: Life Predictionmentioning

confidence: 99%

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VFD machinery vibration fatigue life and multi-level inverter effect

Han

Palazzolo

2012

2012 IEEE Industry Applications Society Annual Meeting

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“…The failure was attributed to the high tidal current speed, caused torsional shaft oscillations and destroyed the turbine rotor blades [6]. Shaft fatigue in tidal generation following severe disturbances was investigated in [7][8][9][10]. While it is easy for an underwater system to fail under the extreme conditions, it is also difficult to maintain and repair.…”

Section: Introductionmentioning

confidence: 99%

Maximum Lifecycle Tracking for Tidal Energy Generation System

Orekan

Zhao

Zhang

et al. 2015

Electric Power Components and Systems

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“…Nevertheless, there is a lack of necessary investigations to ascertain the system's adaptability for very large generators and drives. Studies show [8], [9], that torque oscillations with high frequencies can damage the mechanical parts of a rotating system, while the frequency and not the amplitude is crucial.…”

Section: Introductionmentioning

confidence: 99%

Harmonics in rotating transformer exciting systems for turbine generators

Schmuelling

Habel

2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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Since the expansion of renewables in Germany, a fast start-up of turbine generators increases in importance to compensate load peaks and reactive power. Therefore, the machines need an excitation field at standstill. Conventional brushless excitation systems consist of two different synchronous machines, which are not able to provide currents to the rotating part of the generator without rotational speed. With tiny modifications the excitation system can be implemented with an induction machine without changing rotating components, such as the rectifier wheel. This paper deals with the analytic calculation and simulation of resulting harmonics and their optimization.

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Prediction of Mechanical Shaft Failures Due to Pulsating Torques of Variable-Frequency Drives

Cited by 61 publications

References 20 publications

VFD machinery vibration fatigue life and multi-level inverter effect

VFD machinery vibration fatigue life and multi-level inverter effect

Maximum Lifecycle Tracking for Tidal Energy Generation System

Harmonics in rotating transformer exciting systems for turbine generators

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