Prevention of harmful EDM currents in inverter-fed AC machines by use of electrostatic shields in the stator winding overhang

Magdun, Oliver; Gemeinder, Yves; Binder, A.

doi:10.1109/iecon.2010.5675498

Cited by 42 publications

(19 citation statements)

References 9 publications

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“…At breakdown, the bearing voltage causes an EDM current, which may damage the machine bearings [1]. For the 1.5-kW machine, the measured bearing voltage shows a breakdown at a threshold voltage of nearly 4 V. The early bearing failures can be prevented for the small power induction cage machines if the bearing voltage is reduced below a limit of 1.5 V [30].…”

Section: Calculation Of Bearing Voltagementioning

confidence: 97%

“…The voltages v u,n , v v,n , and v w,n are the voltage drop at the machine winding resistances and inductances, caused by the CM current flow as a superposition of CM current impulses i u,g , i v,g , and i w,g . The parasitic machine capacitances of (3) can be measured [1], [28], [29] or calculated by finite-element methods [30]. In [1], they are given in dependence on the machine rated power.…”

Section: B Calculation Of Bearing Voltagementioning

confidence: 99%

“…The parasitic machine capacitances, represented in Fig. 8 as C RS = 1.66 nF, C WR /3 = 27 pF (C WR1 = 2.7 pF and C WR2 = 24.3 pF are separated by a factor k cap = C g1 /C WS ∼ = 0.1), C bDE = 0.43 nF, and C bNDE = 0.16 nF, were calculated according to [28] and [30]. Due to C insDE C bDE and C insNDE C bNDE , the insulating bearing capacitances may be neglected for the bearing voltage calculation.…”

Section: Calculation Of Bearing Voltagementioning

confidence: 99%

“…For the 1.5-kW machine of Table I, the stator-winding-torotor capacitance per phase C WR /3 = 9.12 pF was preliminary determined according to [30]. With (22), taking k cap = C g1 /C WS = 0.28 nF/1.35 nF = 0.208, we get C WR1 ≈ k cap · C WR /3 = 0.208 · 9.12 = 1.89 pF and C WR2 ≈ (1 − k cap ) · C WR /3 = 0.792 · 9.12 = 7.22 pF.…”

Section: Calculation Of Bearing Voltagementioning

confidence: 99%

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

Magdun

Binder

2014

IEEE Trans. on Ind. Applicat.

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101

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In this paper, several inverter-fed induction machines with rated powers between 1.5 and 240 kW are modeled for calculating the common mode (CM) stator ground current and the capacitive bearing voltage. Simple methods to extract the parameters of the high-frequency machine model from the measured CM and differential mode impedances are presented. Furthermore, the most significant parameters are given for five different machine sizes between 1.5 and 240 kW rated power. Calculation examples are provided in comparison to the experimental results.

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Section: Calculation Of Bearing Voltagementioning

confidence: 97%

Section: B Calculation Of Bearing Voltagementioning

confidence: 99%

Section: Calculation Of Bearing Voltagementioning

confidence: 99%

Section: Calculation Of Bearing Voltagementioning

confidence: 99%

See 2 more Smart Citations

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

Magdun

Binder

2014

IEEE Trans. on Ind. Applicat.

Self Cite

101

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“…They either provide a return path for the HF CM current i CM to avoid the generation of the HF CM flux (that causes the HF circulating bearing currents i b,cir (Maki-Ontto, Luomi, 2003)), or (in most cases) affect the CM equivalent circuit of the machine so that the voltage across the bearing is significantly reduced (Busse et al, 1997d;Ferreira, Trovã o, de Almeida, 2010;Magdun, Gemeinder, Binder, 2010b).…”

Section: Mitigation Techniques: Additional Componentsmentioning

confidence: 98%

Thousands of hits: on inverter-induced bearing currents, related work, and the literature

Mütze

2011

Elektrotech. Inftech.

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A. Mü tze OVE Today, a search for bearing currents in databases on engineering literature may return hundreds or (depending on the database and any additional filter used) thousands of hits. The degree to which the identified papers address the bearing current topic itself varies. Often, the term is used (as it is common with key words) to reflect the wider context and the topicality of the work that is presented, e.g. a discussion of a new filter topology. Without claiming completeness, this paper provides an overview of the various aspects that have been addressed in literature related to the bearing current topic.Tausende von Treffern: Ü ber umrichterbedingte Lagerströ me, zugehö rige Themen und die Literatur.Eine einfache Suche unter dem Stichwort "Lagerströ me in einer Datenbank fü r Ingenieursliteratur kann zu hunderten oder (abhä ngig von der Datenbank und zusä tzlich verwendeten Filtern) tausenden von Treffern fü hren. Das Ausmaß, mit dem die identifizierten Publikationen das Lagerstromthema behandeln, variiert. Oft wird der Begriff (wie es fü r Stichwö rter ü blich ist) verwendet, um den weiteren Zusammenhang und die Aktualitä t des in der jeweiligen Publikation behandelten Themas, wie z. B. eine neue Filtertopologie, widerzuspiegeln. Dieser Beitrag gibt einen Ü berblick ü ber die verschiedenen mit dem Lagerstromthema in Verbindung stehenden Aspekte, die in der Literatur behandelt werde.

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Review of Motor Bearing Currents in Inverter Drive System

Zhi¹,

Li²,

Yan³

et al. 2022

Lecture Notes in Electrical Engineering

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Prevention of harmful EDM currents in inverter-fed AC machines by use of electrostatic shields in the stator winding overhang

Cited by 42 publications

References 9 publications

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

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

Thousands of hits: on inverter-induced bearing currents, related work, and the literature

Review of Motor Bearing Currents in Inverter Drive System

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