Advancements of tribological performance of carbon brushes in electrical motors

Abstract

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Prediction of vacuum cleaner motor brush life: a regression approach

“…To assure a low level of mechanical wear, the formation of a stable friction layer on the contacting surface is of vital importance [9]. This friction layer increases the real contact area and decreases friction, temperature and arcing.…”

The structure of tribolayers at the commutator and brush interface: A case study of failed and non-failed DC motors

“…The presence of the commutator layer (up to a certain level of thickness) leads to a low coefficient of friction but simultaneously disturbs the current conduction through the brush and the commutator due to its relative high electrical resistance. Groth et al [8] investigated the transfer film using Microprobe analysis. In contrast to the previous investigations they concluded that the film is always very thin and contains mainly of MoS 2 .…”

A Wound-Field Pole-Changing Vernier Machine for Electric Vehicles

“…Generally, the brushes often require maintenance and need to be replaced after a certain period of time. However, new brushes have been recently introduced which last much longer than conventional brushes and require less maintenance [35], [36]. Furthermore, brushless topologies such as using sub-harmonic [37] or 3rd harmonic excitation [38] have also been introduced which do not need brushes and slip rings.…”