An evaluation of mitigation techniques for bearing currents, EMI and overvoltages in ASD applications

Zhang, Haoran; Wallace, A.K.

doi:10.1109/28.720452

Cited by 130 publications

(30 citation statements)

References 18 publications

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“…The common mode voltage produced by the inverter excites the capacitive couplings between conductors and motor parts to the ground, generating successive high-frequency oscillatory currents in every dv/dt of the corresponding voltage. As a consequence, EMI problems in industrial plants can arise, as well as misactuation of fault-to-ground protection relays and motor bearing failures [9]. Common-mode current peaks of 50 A have been reported [8] in a textile industry subsystem comprising 75 motors of 3 kW rated power.…”

Section: Introductionmentioning

confidence: 99%

Differential overvoltages and common-mode currents in PWM motor drives: The influence of the cable arrangement on their characteristics

Paula

Lisboa

Guilherme

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

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Transient overvoltages at motor terminals and highfrequency common-mode currents in PWM drive systems have been extensively investigated in the last fifteen years. Nevertheless, some issues concerning such quantities still remain unclear. That is the case of the converter-to-motor cabling influence on the intensity of these high-frequency voltages and currents. Filters of different types have been traditionally used to mitigate these undesired phenomena. However, due to their cost, volume and losses, they can't be considered the ultimate solution of the problem. In this paper, typical industrial cable arrangements will be characterized in terms of the generated transient overvoltages and common-mode currents. It will be shown that variations in the range of 10 to 40 % in the peak values of these quantitites can take place due to different cable disposition. Thus, it can be concluded that special care in the cable installation can lead to significant reduction in these undesired phenom-ena, which in turn downsizes the required filter.

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Section: Introductionmentioning

confidence: 99%

Differential overvoltages and common-mode currents in PWM motor drives: The influence of the cable arrangement on their characteristics

Paula

Lisboa

Guilherme

et al. 2009

2009 35th Annual Conference of IEEE Industrial Electronics

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“…Critical cases have been reported where groups of new motors failed after just few weeks of operation [2]. Aside from the differential overvoltages above mentioned, the PWM inverter naturally generates a common-mode voltage that produces high-frequency currents which, flowing through the capacitive couplings of the motor and cable to the ground, lead to EMI problems, misoperation of ground-fault protection systems and motor bearing failures [3].…”

Section: Introductionmentioning

confidence: 99%

A new strategy for differential overvoltages and common-mode currents determination in PWM induction motor drives

Paula

Chaves

Andrade

et al. 2005

IEEE International Conference on Electric Machines and Drives, 2005.

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The analysis of the transient overvoltages in a PWM motor drive system comprises a wide frequency range, which starts with the low values corresponding to the motor speed, includes the switching harmonics, which can reach up to few hundreds of kHz, and also the cable resonant frequency, which value can be in the MHz range, depending on the cable length. In this context, this work presents a time domain methodology for cable modeling able to represent the cable parameters variation due to skin effect in this broad range of frequencies. Three different methods for cable parameter estimation are also studied and compared in order to be used as an effective tool in the analysis, since frequency-dependent parameter cable models typically require cable parameters in different frequencies as input data for their determination. Since measurements are often unavailable, parameter estimation is strongly desirable. The frequency-dependent cable earth-return model is also included, allowing the computation of the zero-sequence currents generated by the common-mode voltage produced by the inverter. Simulations using the proposed methodology are conducted and the obtained results are compared with measurements, showing good agreement.

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“…T he traditional means of regulating the ow from these loads, by throttling valves and ba‚ es, respectively, are well known to be ine cient. Power-electronic adjustable-speed, or variable-frequency drives (VFD), have been very successfully introduced to provide a high-e ciency alternative means of control by matching the motor output speed and torque to the requirements of the load; however, the resulting energy savings are obtained at the cost of signi cant capital expenditure (for the VFD) and, in certain cases, operational problems for the motor [1]. T hese problems include increased stress of motor insulation, especially for smaller motors connected via long cable lengths, common mode voltage eOE ects leading to motor shaft voltage and bearing currents, electromagnetic interference (EMI), and a high harmonic content of the currents drawn from the supply, particularly at lower load Manuscript received in nal form on 4 January 2001.…”

Section: Introductionmentioning

confidence: 99%

“…Address correspondence to Dr. Annette von Jouanne. levels. EOE ective solutions to these problems have been developed [1], but these introduce additional complexity and cost.…”

Section: Introductionmentioning

confidence: 99%

Performance Testing of Power Electronic and Permanent-Magnet Adjustable-Speed Drives

Wallace¹

2001

Electric Power Components and Systems

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T his pape r desc ribe s the physical co nstruc tion, basic principles o f o pe ratio n, a serie s of compariso n tests co nducted o n an adjustable speed coupling syste m ( A SCS) , and a low-vo ltage variable-freque ncy drive ( V FD ). T hese syste ms have been te sted at three diOEe re nt ratings ' ( 50 hp, 100 hp, 200 hp) driving load pro le s re prese nting both fans and pumps. T he A SCS emplo ys high e nergy-product neodymium/iro n/bo ro n (Ne FeB ) pe rmane nt magnets, which ac t on stee l-backed copper discs to pro vide to rque transfer from moto r to load witho ut mec hanical contac t. T he slip that occurs between the moto r and load shafts can be c hanged by adjustment o f the mechanical c learance of the magne ts and the co ppe r disc s. T hus, a form of speed co ntro l fo r the load is aOEec ted fo r a syste m drive n by a constant freque ncy inductio n moto r. T he te st results co mpare the e nergy savings pote ntials o f the V FD and the A SCS and the merits and disadvantages o f the two system s re lated to motor o peratio n and powe r syste m connec tio n issue s.

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An evaluation of mitigation techniques for bearing currents, EMI and overvoltages in ASD applications

Cited by 130 publications

References 18 publications

Differential overvoltages and common-mode currents in PWM motor drives: The influence of the cable arrangement on their characteristics

Differential overvoltages and common-mode currents in PWM motor drives: The influence of the cable arrangement on their characteristics

A new strategy for differential overvoltages and common-mode currents determination in PWM induction motor drives

Performance Testing of Power Electronic and Permanent-Magnet Adjustable-Speed Drives

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