Closed-form approach for predicting overvoltage transients in cable-fed PWM motor drives for MEA

Pietrini, Giorgio; Barater, Davide; Concari, Carlo; Galea, Michael; Gerada, Chris

doi:10.1109/ecce.2016.7854917

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…V DC being the DC link voltage, K(t r ) is a function of the rise time and approaches one only for a very short rise time (<50 ns); OF has been mentioned before as shown in Figure 4, and a winding factor of 0.7 is adopted accounting for voltage distribution [58] and may be useful when the experiment and simulation are missing. In addition to the adoption of empirical factors, the high frequency (HF) model considering machine parameters can be used to predict both the EM terminal voltage [107][108][109][110][111][112][113][114][115] and turn/turn voltage [107,108,114,[116][117][118][119]. An example could be found in [108] as shown in Figure 9.…”

Section: Modelling Of Voltage Transientmentioning

confidence: 99%

Reliability-Oriented Design of Inverter-Fed Low-Voltage Electrical Machines: Potential Solutions

Giangrande

Madonna³

et al. 2021

Energies

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Transportation electrification has kept pushing low-voltage inverter-fed electrical machines to reach a higher power density while guaranteeing appropriate reliability levels. Methods commonly adopted to boost power density (i.e., higher current density, faster switching frequency for high speed, and higher DC link voltage) will unavoidably increase the stress to the insulation system which leads to a decrease in reliability. Thus, a trade-off is required between power density and reliability during the machine design. Currently, it is a challenging task to evaluate reliability during the design stage and the over-engineering approach is applied. To solve this problem, physics of failure (POF) is introduced and its feasibility for electrical machine (EM) design is discussed through reviewing past work on insulation investigation. Then the special focus is given to partial discharge (PD) whose occurrence means the end-of-life of low-voltage EMs. The PD-free design methodology based on understanding the physics of PD is presented to substitute the over-engineering approach. Finally, a comprehensive reliability-oriented design (ROD) approach adopting POF and PD-free design strategy is given as a potential solution for reliable and high-performance inverter-fed low-voltage EM design.

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Section: Modelling Of Voltage Transientmentioning

confidence: 99%

Reliability-Oriented Design of Inverter-Fed Low-Voltage Electrical Machines: Potential Solutions

Giangrande

Madonna³

et al. 2021

Energies

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“…The overvoltage phenomenon is well known and has already been largely investigated. A lot of research has focused on the development of models or approaches to predict it, such as in [18]. In addition, while the over-voltage occurring at the machine terminals can be easily measured, a V direct access to the turns is needed to check the voltage distribution in the winding.…”

Section: A Motivationmentioning

confidence: 99%

Sensitivity Analysis on the Voltage Distribution within Windings of Electrical Machines fed by Wide Band Gap Converters

Pastura

Nuzzo

Franceschini

et al. 2020

2020 International Conference on Electrical Machines (ICEM)

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In the last years, wide band gap devices are seeing a significant widespread in electric drives, due to their higher performance compared to conventional semiconductors. However, they also produce higher electric stress due to overvoltages and uneven voltage distributions among winding turns of electrical machines fed by them, which can lead to premature failures and/or reduced lifetimes.This paper presents a sensitivity analysis on the voltage distribution across stator winding turns of an electric motor intended for aerospace applications. The effects of the surge voltage characteristic parameters, such as dv/dt, voltage magnitude and parasitic impedances, are investigated. An equivalent circuit approach, based on the multi-transmission line theory, is developed and implemented in MatLab-Simulink environment, while the relevant circuital parameters are estimated through finite element analysis performed with MagNet® and ElecNet® software.

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“…The design is based on (3), where Zf is the filter impedance and cc is the per-meter cable capacitance. For example, if an RC filter was used (see Fig.1), Zf can be calculated as in (4), where Rf and Cf are the resistance and the capacitance of the filter, respectively, and ω is the angular frequency. Rf needs to be as in (5), where Lc is the equivalent lumped inductance of the cable.…”

Section: Filters At Motor Terminalsmentioning

confidence: 99%

“…They are characterised by significantly short rise times resulting in high voltage gradients (dv/dt), which may lead to significant voltage overshoot at motor terminals [3]. In fact, when the voltage rise time tr at the inverter output is at least half or less the traveling voltage pulse propagation time tp [3], [4], a full reflection occurs. Therefore, when tr < 2tp, the voltage Vm at motor terminals can be expressed by (1), where Vdc is the DClink voltage and Γ the reflection coefficient.…”

Section: Introductionmentioning

confidence: 99%

Dv/Dt Filtering Techniques for Electric Drives: Review and Challenges

Pastura

Nuzzo

Kohler

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

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The use of wide band gap devices in power converters is becoming more and more popular since they enable operations at higher switching frequencies, voltages and temperatures compared to traditional power semiconductors, while also improving the efficiency. However, in electric drives, they also tend to increase voltage overshoots at motor terminals and to produce uneven voltage distributions across stator windings, due to their high rate of voltage change over time (dv/dt). In order to mitigate these issues, passive filters can be employed. The aim of this paper is to give an overview of possible solutions based on passive filters, analyzing the main advantages and drawbacks. A comprehensive, qualitative comparative study is carried out taking into account common mode currents reduction, power losses, costs, dimensions and reliability.

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Closed-form approach for predicting overvoltage transients in cable-fed PWM motor drives for MEA

Cited by 6 publications

References 8 publications

Reliability-Oriented Design of Inverter-Fed Low-Voltage Electrical Machines: Potential Solutions

Reliability-Oriented Design of Inverter-Fed Low-Voltage Electrical Machines: Potential Solutions

Sensitivity Analysis on the Voltage Distribution within Windings of Electrical Machines fed by Wide Band Gap Converters

Dv/Dt Filtering Techniques for Electric Drives: Review and Challenges

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