Design Aspects of Conductive Microfiber Rings for Shaft Grounding Purposes

Muetze,; Oh, Teresa

doi:10.1109/07ias.2007.59

Cited by 9 publications

(12 citation statements)

References 20 publications

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“…Similar to above, we recapitulate results presented in [3] to show the orders of magnitudes of the numbers of fibers. Here, [3] dv Lg /dt C wf * ) we approximate the fiber current density with 10 10 A/m 2 , using [4] as a starting point and assumed that only (1 .…”

Section: B Number Of Fibersmentioning

confidence: 50%

“…These currents have frequencies of up to several megahertz. For the amplitudes of i com and i b , I com and I b respectively, we refer to the simplified estimations carried out in [3] and recapitulate the results in Table I, where dv Lg /dt is the dv/dt of the voltage between the motor terminal connection ("line") and the ground and C wf is the stator winding-to-frame capacitance.…”

Section: Review: Orders Of Magnitudes a Current Amplitudes And mentioning

confidence: 99%

“…We have shown earlier that rings made from millions of conductive microfibers present an alternative brush concept that has shown a suitable alternative to the conventional carbon brushes [2], [3]: If properly designed, such rings can meet all the demands on the latter, but have ultra-low friction and negligible frictional wear and are very robust toward contamination. In addition, they also allow current-conduction based on electric field emission and are therefore especially suitable for use with HF currents and voltages.…”

Section: Introductionmentioning

confidence: 98%

“…When the microfibers lose "good" electric contact by mechanical contact, a breakdown due to local field emission will occur somewhere along the circumference, thereby reestablishing the electric contact. For more detailed explanations, we refer to the earlier literature [2], [3].…”

Section: Introductionmentioning

confidence: 99%

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Current-Carrying Characteristics of Conductive Microfiber Rings for High Frequencies and Current Amplitudes

Muetze

Oh²

2008

2008 IEEE Industry Applications Society Annual Meeting

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Rings made from millions of conductive microfibers have shown to be a suitable alternative to conventional brushes using electrically conductive carbon graphite. If properly designed, such modern brushes can not only meet all the demands on carbon brushes while excluding the problems of excessive wear and hot-spotting/thermal wear commonly quoted with the latter, but are also especially suitable for use with high-frequency currents and voltages, thereby further expanding their fields of application. In this paper, we describe the current-carrying characteristics of such rings for high frequencies up to 10 MHz and large current amplitudes of several tens of amperes. We develop the theory to understand these characteristics and thus the ring design and support and illustrate the theoretical findings with experimental results.

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Section: B Number Of Fibersmentioning

confidence: 50%

Section: Review: Orders Of Magnitudes a Current Amplitudes And mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Current-Carrying Characteristics of Conductive Microfiber Rings for High Frequencies and Current Amplitudes

Muetze

Oh²

2008

2008 IEEE Industry Applications Society Annual Meeting

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“…They aim to protect the bearing (1) by preventing the built-up of CM voltage across the bearing, eliminating the source of discharge bearing currents at the point of the bearing, and (2) providing a low-impedance, parallel path for any current that might be caused by the HF CM current i CM (i b,circ, i b,rg ), e.g. (Muetze, Oh, 2008a;Muetze, Oh, 2008b).…”

Section: Mitigation Techniques: Additional Componentsmentioning

confidence: 99%

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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Overview of shaft voltage and bearing current mitigation methods applied on the victim machine

Teshale,

Biru

2023

Electr Eng

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Design Aspects of Conductive Microfiber Rings for Shaft Grounding Purposes

Cited by 9 publications

References 20 publications

Current-Carrying Characteristics of Conductive Microfiber Rings for High Frequencies and Current Amplitudes

Current-Carrying Characteristics of Conductive Microfiber Rings for High Frequencies and Current Amplitudes

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

Overview of shaft voltage and bearing current mitigation methods applied on the victim machine

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