Thyristor-assisted sliding-contact commutation

Bates, J.J.; Sridhar, T. V.

doi:10.1049/piee.1966.0051

Cited by 4 publications

(2 citation statements)

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“…In all but the smaller machines, this uncertain contact has led to severe marking of the leading (incoming) edge of the active segment. Hence, the development has taken place of thyristor-assisted commutation, 1 where each single solid brush is divided into two part brushes, and the thyristors are triggered so that current does not flow from a brush to an active segment unless the brush is sitting fully on an active segment. This is, of course, a more complicated system than diode commutation, requiring the firing of the thyristors to be synchronised with the position of the armature.…”

Section: Figmentioning

confidence: 99%

“…This keeps the rubbing speed of the fibres low and Starting and low-speed running with diode commutation With thyristor-assisted commutation, sparkless starting is accomplished by the use of a commutating transformer. 1 With diode-assisted commutation this is not possible. However, the resistances in series with the fibre brushes play an Some differences between thyristor-assisted commutation and diode-assisted commutation There are some important differences between diodeassisted commutation and thyristor-assisted commutation.…”

Section: Figmentioning

confidence: 99%

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Diode-assisted commutation

Bates¹

1970

Proc. Inst. Electr. Eng. UK

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The use of diodes to assist commutation in d.c. machines is not new, and the basic principles were described as long as 40 years ago. However, attempts to construct such machines have always suffered from problems of current collection from a surface consisting of alternate active and inactive segments. Thyristorassisted commutation was introduced a few years ago as a means of avoiding the major surface-damage problem. Diode-assisted commutation is very much simpler, however, and the letter describes how recent work using carbon-fibre brushes has now largely overcome the particular contact problems of the diodecommutated machine.

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Section: Figmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%