The wave character of commutator wear in electrical machines

Wilk, Andrzej; Moson, I.

doi:10.1016/s0043-1648(02)00235-1

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…Brushes and collectors made of Carbon/Carbon composites are widely used in electrical motors to ensure the electrical current to flow from a rotating part to a stationary part (Wilk and Moson 2002;Zhongliang et al 2008). The wear of these composite materials was studied in the literature and the complex wear mechanism due to the multiples factors such as velocity, atmosphere, pressure, etc.…”

Section: Introductionmentioning

confidence: 99%

A TPD-MS study of the adsorption of ethanol/cyclohexane mixture on activated carbons

et al. 2011

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The adsorption of ethanol/cyclohexane binary mixtures on different types of activated carbons was studied in this work by temperature programmed desorption coupled with mass spectroscopy (TPD-MS). The texture, morphology and surface chemistry of the carbons were evaluated by N 2 adsorption, scanning electron microscopy (SEM) and TPD-MS techniques. The ethanol and cyclohexane TPD-MS desorption profiles showed that specific interactions between the carbon material and the adsorbate are involved during the adsorption. Most of the activated carbons adsorb strongly ethanol on the surface, leading to desorption temperatures above 100°C. Only one carbon exhibits an affinity for cyclohexane. These observations were correlated to the different surface chemistry of the materials.

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Section: Introductionmentioning

confidence: 99%

A TPD-MS study of the adsorption of ethanol/cyclohexane mixture on activated carbons

et al. 2011

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“…To examine and determine the importance of the elements that influence brush wear, four control factors were selected. A number of previous studies have indicated that these factors have significant influence on brush wear [5][6][7][8]. The combination of factors was also made by the level of experiment using the L9 (3 4 ) orthogonal array according to the DOE.…”

Section: Setting the Doe Based On Orthogonal Arraymentioning

confidence: 99%

Determination of accelerated condition for brush wear of small brush-type DC motor in using Design of Experiment (DOE) based on the Taguchi method

Shin

Lee

2011

J Mech Sci Technol

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This research was conducted to understand friction and wear due to mechanical and electrical contact between a brush and a commutator, which play an important role in driving brush-type DC motors, and to predict the motor life through brush wear. To identify the influencing factors, the variables used in the experiments were the operating voltage, the current load, the rotational speed, and the environmental temperature. The design of experiment used for the analysis of brush wear was based on the Taguchi method. An independent condition was provided for each factor during the experiment. The results indicate the high contribution of current and temperature to the wear behavior. The operation voltage showed negligible influence on the wear behavior.

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“…Commutation is a change of a balanced state to another, inducing a rapid variation of the currents in the winding and consequently those that cross the commutator bares . These commutator bare currents being unable to change in a discontinuous way compensate this rapid variation by sparks , which carry the fast wear of the commutator .…”

Section: Introductionmentioning

confidence: 99%

Commutation modelling and sparks reduction based on coupled circuit method

Kelaiaia

Labar

Kamel

et al. 2012

Int. J. Numer. Model.

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SUMMARYThe commutating machines have a notable effect on the exchanges in brush–commutator contact area, which is particularly obvious when determining the intensity of sparks located on the brush. With time, higher current density at the descending edge promote sparks excitation, which itself increases intensity of the electrical erosion, brush temperature and thus also the wear. So in order to make an analytical study of commutation phenomenon, the coupled circuit method was developed. Therefore, a generalized mathematical model of the commutation, for brush–commutator, is established and can be extended for any other types of commutation on the basis of electromagnetic field (e.g. transformers and phase shift transformer. This model provides a greater efficiency to explain the impact of the electromagnetic fluxes surrounding brush area (or switch), specially for the current transition of the commutation process. Successful commutation is defined as operation in normal service, with no serious damages to the commutator, brushes or switches due to sparking that might require abnormal maintenance. It is recognized that some visible sparking are not evidence of unsuccessful commutation. The recommendation to improve the commutation (to achieve longer brush life) is the implementation of the proposal (slotted brush), which provides a linear and a sweet transition of currents in the coils of commutation. Copyright © 2012 John Wiley & Sons, Ltd.

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The wave character of commutator wear in electrical machines

Cited by 10 publications

References 14 publications

A TPD-MS study of the adsorption of ethanol/cyclohexane mixture on activated carbons

A TPD-MS study of the adsorption of ethanol/cyclohexane mixture on activated carbons

Determination of accelerated condition for brush wear of small brush-type DC motor in using Design of Experiment (DOE) based on the Taguchi method

Commutation modelling and sparks reduction based on coupled circuit method

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