RU2178225C2 - Electrical machine current collecting device - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: device has longitudinally split brush contacting the commutator whose effective surface is rough; commutator-to-brush clearance and split joint of brush are filled with lubricating material incorporating conducting powder its amount being 2- 15% of lubricating material volume. Vertical electricity conducting filaments are introduced in addition into lubricating material placed in split joint of brush. EFFECT: enhanced reliability of current collection due to improved quality of wiping contact and reduced arcing. 1 dwg

Description

 The invention relates to electrical engineering and can be used in collector electric machines of increased power, for example in traction engines of rolling stock of railways.

 A current collector device for an electric machine is known, comprising a brush cut in the longitudinal direction, in contact with a collector having roughnesses on the working surface, while lubricant is placed between the brush and the collector, as well as in the section of the brush (see a.s. USSR, MKI N 01 R 39/40, 1233232, 1984).

 This device does not provide sufficiently reliable current collection.

 As a prototype, we selected the device closest in technical essence to the claimed one (see A.S. USSR, MKI N 01 R 39/40, 39/56 1403150, 1988). This is a current collector for an electric machine, containing a longitudinally cut brush in contact with a collector having a roughness on the working surface, while between the brush and the collector, as well as in the section of the brush, a lubricant is introduced into which 2-15 conductive filler is introduced % of the volume of lubricant.

 Insufficiently reliable current collection - a disadvantage of the prototype.

 The invention solves the problem of increasing the reliability of current collection by improving the quality of the sliding contact and by reducing sparking and wear.

 The problem is achieved in that in the current collector for an electric machine containing a longitudinally cut brush in contact with a collector having a roughness on the working surface, lubricant in the amount of 2-15 is placed between the brush and the collector, as well as in the section of the brush % of the volume of lubricant according to the invention, electrically conductive filaments vertically arranged and evenly distributed in longitudinal section through tki.

 The introduction of additionally into the conductive filler of the lubricant of electrically conductive threads vertically and evenly spaced in the longitudinal section of the brush — this feature determines the novelty of the technical solution.

 Note that the electrically conductive filaments can be made of soft metal, for example, copper or carbon. The use of carbon filaments has the greatest prospects.

 The invention is further illustrated by an example of its specific implementation with reference to the accompanying drawing, which shows a current collector for an electric machine.

 The device comprises a brush 2, longitudinally cut in contact with the collector 1, mounted in the briquette 3. A loading device 4 presses the brush on the collector 4. Lubricant 5 is placed between the brush and the collector, as well as in the section of the brush 2, which fills the space between the roughness of the collector roughness profile and contains an electrically conductive powder filler in an amount of 2-15% of the volume of the lubricant. Along with the powder filler, vertically arranged electrically conductive threads 6, made, for example, of carbon or copper, are introduced into the lubricant into the lubricant section 2.

 The current collector for an electric machine operates as follows.

 When applying the cut brush 2 to the collector 1 and bringing it into rotation, the lubricant 5 enters the friction zone. Particles of electrically conductive powder filler fall into the contact gap and form additional conductivity bridges from the collector to the brush. Electrically conductive filaments 6 can increase the electrical conductivity in the context of the brush and increase the reliability of the current collection while reducing sparking between the brush and the collector. This additionally reduces wear on the conductive tribosystem collector - brush.

 Compared with the prototype, the quality of current collection is increased and wear is reduced by reducing spark formation.

Claims (1)

 A current collector for an electric machine, containing a longitudinally cut brush in contact with a collector having a roughness on the working surface, while between the collector and the brush, as well as in the section of the brush, lubricant is introduced into which the conductive powder is introduced in a volume of 2-15% from the volume of the lubricant, characterized in that in the lubricant placed in the context of the brush, vertically arranged electrically conductive threads are additionally included.