High-Frequency Induction Machine Modeling for Common Mode Current and Bearing Voltage Calculation

Magdun, Oliver; Binder, A.

doi:10.1109/tia.2013.2284301

Cited by 101 publications

(64 citation statements)

References 36 publications

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“…The grounding properties of different components also lead to different current paths and amplitudes [75]. Thus, many researches have been carried out to model the bearing currents under different electric parameters [76][77][78]. In comparison, the EDM currents and the high-frequency "circulating" current are the largest, accounting for the highest bearing current ratios, while other types of bearing currents receive less attention.…”

Section: "Circulating" Currentmentioning

confidence: 99%

Electrical bearing failures in electric vehicles

2020

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In modern electric equipment, especially electric vehicles, inverter control systems can lead to complex shaft voltages and bearing currents. Within an electric motor, many parts have electrical failure problems, and among which bearings are the most sensitive and vulnerable components. In recent years, electrical failures in bearing have been frequently reported in electric vehicles, and the electrical failure of bearings has become a key issue that restricts the lifetime of all-electric motor-based power systems in a broader sense. The purpose of this review is to provide a comprehensive overview of the bearing premature failure in the mechanical systems exposed in an electrical environment represented by electric vehicles. The electrical environments in which bearing works including the different components and the origins of the shaft voltages and bearing currents, as well as the typical modes of electrical bearing failure including various topographical damages and lubrication failures, have been discussed. The fundamental influence mechanisms of voltage/current on the friction/ lubrication properties have been summarized and analyzed, and corresponding countermeasures have been proposed. Finally, a brief introduction to the key technical flaws in the current researches will be made and the future outlook of frontier directions will be discussed.

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Section: "Circulating" Currentmentioning

confidence: 99%

Electrical bearing failures in electric vehicles

2020

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“…It is possible to provide an equivalent circuit, as shown in Figure 1b. A model, an equivalent circuit, and the method of calculating its parameters can be found in [19,20] for further information. It is possible to assume an equivalent capacitance instead of the equivalent circuit, as presented in Figure 1c, to evaluate an inverter's CMC characteristics without using any sophisticated measurements.…”

Section: Operating Principle Of the Modified Six-phase Invertermentioning

confidence: 99%

In depth study of two solutions for common mode current reduction in six-phase machine drive inverters

Abdoli¹,

Eshkevari²,

Mosallanejad³

2021

Turkish Journal of Electrical Engineering and Computer Sciences

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Common-mode current (CMC) destroy machine bearings in the long run and increase electromagnetic interference. According to standards, the RMS value of CMC must be lower than 0.3A. Theories show that CMC is originated by applying zero states to the inverter. In this paper, the performance of two solutions in reducing CMC for six-phase machines is investigated. In the first solution, the traditional six-phase inverter is modified by adding two serial power switches on its input terminal. This method is an extended version of a method that has been presented for three-phase inverters, reduces CMC by optimizing the circuit structure. In the second solution, a new space vector modulation (SVM) strategy is proposed, and the inverter topology remains unchanged. In the first method, the modified inverter disconnects from its DC-bus whenever zero vectors are applied, while in the second method, zero vector times are modified. Experimental results evaluate the performance of these two approaches to diminishing the CMC problem. For this purpose, a 380V/5.5kW prototype has been prepared. According to the results, the first solution decreases CMC by 75% below the standard value, and the second method decreases CMC by 45%. Efficiency analysis indicates that the topology modification plan is useful for low-power applications, while modulation improvement can be used for high-power applications due to lower power losses.

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“…It is reasonable to find the frequency response of common mode impedance of the electric machine. Thus, the proposed equivalent circuit parameters can be found by determining the resonance frequency [6]. LCM prepares a simple model especially for analysing the impact of PWM pulse on the bearings.…”

Section: Lumped Circuit Model (Lcm)mentioning

confidence: 99%

“…The parasitic capacitances are c ww (conductor-to-conductor), c ws (conductor-to-core of stator), c wr (conductor-to-rotor), c wg (conductor-to-ground), c sg (core of stator-to-ground), c rg (rotor-toground), c sr (core of stator-to-rotor) and c bf (bearing-to-ground). l w , l ww and l wr are the self-inductance of winding's conductor, and conductor-to-conductor and the conductor-to-rotor mutual [6] inductances, respectively. ρ c , μ r and ϵ r are conductivity, magnetic mobility and electric permittivity factors, respectively.…”

Section: Multi-conductor Transmission Line (Mtl)mentioning

confidence: 99%

Survey on high‐frequency models of PWM electric drives for shaft voltage and bearing current analysis

Asefi

Nazarzadeh

2017

IET Electrical Systems in Transportation

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In this study, a review on high-frequency modelling in electric machines is conducted. Pulse-width modulation (PWM) creates common-mode-voltage (CMV) and common-mode-current (CMC) in electric drives with high-frequency impacts such as shaft voltage and bearing current which in turn cause bearing failures. To predict and reduce these failures in an electric machine, transitional modelling of high-frequency pulses is necessary. At the first step, several methods for high-frequency modelling in an electric drive are categorised. At the second step, several types of bearing currents discussed and CMV and CMC in electric drives are introduced. At the third step, CMV, CMC and bearing currents are simulated for six types of PWM methods and experimental verification is reported. Finally, root-mean-square value of a distorted parasitic current is introduced for comparing the electromagnetic effects of PWM methods.

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High-Frequency Induction Machine Modeling for Common Mode Current and Bearing Voltage Calculation

Cited by 101 publications

References 36 publications

Electrical bearing failures in electric vehicles

Electrical bearing failures in electric vehicles

In depth study of two solutions for common mode current reduction in six-phase machine drive inverters

Survey on high‐frequency models of PWM electric drives for shaft voltage and bearing current analysis

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