Basic Study on Construction of Analysis Model for Brush Wear in Sliding Electric Contacts

Yanagita, Norihito; Iwata, Takeshi; Kato, Tatsuro; Tsuchitani, Osamu; Fujigaki, Tetsuo; Iizuka, Motonobu

doi:10.1541/ieejias.132.1097

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Previously, the governing equation of unsteady heat conduction of electric contacts has been proposed by Utsumi [5] and Yanagita et al [6]. However, the authors point out that the φ-θ theory which is applicable only to a steady-state condition is used for this unsteady equation, and the steady solution of this unsteady equation does not coincides with the φ-θ theory.…”

Section: Temperature Distribution Analysismentioning

confidence: 99%

Wear Mechanism of Current Collecting Materials due to Temperature Distribution Analysis Considering Degenerated Layer

Yamashita

Adachi

2019

Tribology Online

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To clarify the wear mechanism of current collecting materials such as a contact wire and a contact strip under electric current condition, it is necessary to clarify temperature distribution around the contact spot. However, the traditional method of estimating the maximum contact temperature such as the φ-θ theory cannot estimate the temperature distribution. In this paper, we newly proposed an electric field analysis model of hard-drawn copper and iron-based sintered alloy considering a degenerated layer such as an oxide film and wear debris. Then, we newly proposed the heat conduction equation applying the Wiedemann-Franz law, and analyzed temperature distribution in electrodes. As a result, we find that the relation between the maximum temperature and the contact voltage even in dissimilar electrodes are based on the φ-θ theory. The temperature distribution in electrode changes depending on whether or not degenerated layers exist, and the maximum temperatures of each electrode are not necessarily the same as those estimated by the φ-θ theory. Finally, we clarify the influence of the degenerated layer on the melting condition of electrodes, and explain the electric wear phenomena observed in the previous wear test.

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Section: Temperature Distribution Analysismentioning

confidence: 99%

Wear Mechanism of Current Collecting Materials due to Temperature Distribution Analysis Considering Degenerated Layer

Yamashita

Adachi

2019

Tribology Online

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“…2 shows a process of showering arc at mechanical contacts. Along with the decrease of mechanical contacts area resulting from the sliding of segments, (a) mechanical contacts melt due to concentrated current found within the minute area and the bridge becomes elongated as a result of the sliding (17) . Then, (b) the contacts are separated mechanically by means of a bridge rupture, and (c) a steady arc is generated to maintain electrical connection.…”

Section: Behavior Of Showering Arc With Spike Surgementioning

confidence: 99%

Conducted EMI Simulation for a DC-DC Converter: a DC Brush Motor System Considering Showering Arc at Mechanical Contacts

et al. 2023

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This paper provides an overview of a circuit analysis model for a DC brush motor, taking into consideration showering arc events. A mechanical contacts model that reproduces showering arc behavior is developed by combining new variable resistors with the steady arc model. As a result, spike surge waveforms can now be simulated via circuit analysis. It is also become clear that spike surges with continuous showering arcs constitute the maximum condition of conducted EMI. The measured and simulated conducted EMI show good agreement within 9 dB up to 108 MHz, in accordance with the CISPR 25 standard. Moreover, it is now possible to quantitatively predict the amount of conducted EMI in a system comprising a step-down DC-DC converter and a DC brush motor, by considering a dominant magnetic coupling and parasitic impedances.

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Analysis of DC Brush Motor Spike Surge and Proposal of a Simulation Model Based on an Equivalent Circuit

et al. 2022

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Basic Study on Construction of Analysis Model for Brush Wear in Sliding Electric Contacts

Cited by 3 publications

References 2 publications

Wear Mechanism of Current Collecting Materials due to Temperature Distribution Analysis Considering Degenerated Layer

Wear Mechanism of Current Collecting Materials due to Temperature Distribution Analysis Considering Degenerated Layer

Conducted EMI Simulation for a DC-DC Converter: a DC Brush Motor System Considering Showering Arc at Mechanical Contacts

Analysis of DC Brush Motor Spike Surge and Proposal of a Simulation Model Based on an Equivalent Circuit

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