Frequency-Domain Model for Calculation of Voltage Distribution Through Random Wound Coils and Its Interaction With Stray Capacitances

Martínez-Tarifa, Juan Manuel; Amaras-Duarte, H.; Sanz-Feito, J.

doi:10.1109/tec.2008.926039

Cited by 19 publications

(10 citation statements)

References 16 publications

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“…DPEC can be used in the modelling of the random‐wound‐coil. For instance, the voltage distribution on a random wound electric machine was studied by DPEC [8].…”

Section: Methods For Analysis Of High‐frequency Effects In Electricmentioning

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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“…DPEC can be used in the modelling of the random‐wound‐coil. For instance, the voltage distribution on a random wound electric machine was studied by DPEC [8].…”

Section: Methods For Analysis Of High‐frequency Effects In Electricmentioning

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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“…Various models for simulating the voltage distribution among the turns of different machine winding types have been presented. Initiated by [76][77][78][79][80], the multiconductor transmission line (MTL) model, which considers wave propagation within coils, has been developed as a lossy MTL model [81], nonlinear MTL model [82], a finite element method (FEM) [81][82][83] or certain average techniques [84][85][86] to characterize different elements from the winding within MTL theory, and a frequency-domain methodology to calculate the distributed parameters of equivalent circuits [87] to predict the transient voltage distribution in a machine winding under steep-fronted surges. In this regard, it is well-known that the maximum voltage on the coil increases as the surge-front time decreases.…”

Section: High-frequency Emt Models For Machine Stator Windingmentioning

confidence: 99%

“…Both skin and proximity effects are frequency-dependent phenomena and are more critical in high-frequency ranges. However, they have only been modeled for up to a few MHz [87], and remain a challenge for higher frequencies. [94].…”

Section: High-frequency Emt Models For Machine Stator Windingmentioning

confidence: 99%

Accelerated insulation aging due to fast, repetitive voltages: A review identifying challenges and future research needs

Ghassemi

2019

IEEE Trans. Dielect. Electr. Insul.

106

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Although the adverse effects of using power electronic conversion on the insulation systems used in different apparatuses have been investigated, they are limited to low slew rates and repetitions. These results cannot be used for next-generation wide bandgap (WBG)-based conversion systems targeted to be fast (with a ⁄ up to 100 kV/μs) and operate at a high switching frequency up to 500 kHz. Frequency and slew rate are two of the most important factors of a voltage pulse, influencing the level of degradation of the insulation systems that are exposed to such voltage pulses. The paper reviews challenges concerning insulation degradation when benefitting from WBG-based conversion systems with the mentioned ⁄ and switching frequency values and identifies technical gaps and future research needs. The paper provides a framework for future research in dielectrics and electrical insulation design for systems under fast, repetitive voltage pluses originated by WBG-based conversion systems.

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“…A well-established equivalent circuit model [12], [13] for an n -turn energy coupling coil was used to analyze the coil characteristics (Fig. 4).…”

Section: Circuit Modelmentioning

confidence: 99%

“…In this paper, we utilized a well-established lumped circuit model [12], [13], with and without the consideration of the intrawinding resistors and capacitors, to investigate the power loss of segmented and unsegmented energy coupling coils. The winding conduction loss and intrawinding dielectric loss were investigated individually.…”

Section: Introductionmentioning

confidence: 99%

Power Loss Analysis and Comparison of Segmented and Unsegmented Energy Coupling Coils for Wireless Energy Transfer

Tang

McDannold

2015

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper investigated the power losses of unsegmented and segmented energy coupling coils for wireless energy transfer. Four 30-cm energy coupling coils with different winding separations, conductor cross-sectional areas, and number of turns were developed. The four coils were tested in both unsegmented and segmented configurations. The winding conduction and intrawinding dielectric losses of the coils were evaluated individually based on a well-established lumped circuit model. We found that the intrawinding dielectric loss can be as much as seven times higher than the winding conduction loss at 6.78 MHz when the unsegmented coil is tightly wound. The dielectric loss of an unsegmented coil can be reduced by increasing the winding separation or reducing the number of turns, but the power transfer capability is reduced because of the reduced magnetomotive force. Coil segmentation using resonant capacitors has recently been proposed to significantly reduce the operating voltage of a coil to a safe level in wireless energy transfer for medical implants. Here, we found that it can naturally eliminate the dielectric loss. The coil segmentation method and the power loss analysis used in this paper could be applied to the transmitting, receiving, and resonant coils in two- and four-coil energy transfer systems.

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Frequency-Domain Model for Calculation of Voltage Distribution Through Random Wound Coils and Its Interaction With Stray Capacitances

Cited by 19 publications

References 16 publications

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

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

Accelerated insulation aging due to fast, repetitive voltages: A review identifying challenges and future research needs

Power Loss Analysis and Comparison of Segmented and Unsegmented Energy Coupling Coils for Wireless Energy Transfer

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