SU1387082A1 - Brush holder for electric machine - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to increase the uniformity of wear of the two brushes, as well as to increase their performance under the conditions of the effect of radially directed disturbances. The brush holder includes a housing with two brush clips and two pressure roll springs connected to a spring holder. The pressure is stabilized by each of the two springs, the rolls of which are formed at the ends of a common spring tape, the straightened middle part of which is fixed with the formation of an elastic loop on the spring holder film. The bar is fixed in a groove between the windows of the brush holder with support on the said elastic loop. 6 Il.

Description

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The invention relates to electrical engineering in terms of creating brush holders for electric machines, preferably high-power reversible machines.

The aim of the invention is to improve the uniformity of pressing the brushes.

Figure 1 shows the brush holder of an electric machine complete with brushes; figure 2 is the same, top view; figure 3 - the housing of the brush holder longitudinal section; figure 4 is the same, top view; FIG. 5 shows a spring holder assembled with pressure roll springs; FIG. figure 6 is the same, side view.

The brush holder includes a housing 1 with two brush holders 2 for times

electrical spacers brushes. The clips have a common wall 3 in the form of a semi-bulkhead, in which groove 4 is made to secure the removable spring-holding device 5 therein. From below, groove 4 is bounded by a supporting surface 6, and at its upper edge, supporting slots 7 are made on the side surfaces of the wall body spring holder 5 moving at its articulation with the brush holder body, spring holder 5 is made in the form of a strip 8 with side steps-clamps 9, which are able to enter the support slots 7. On the spring holder two pressure roll strings are fixed constant pressure springs 10, made of a single spring tape, which bends around its middle part with the formation of an elastic loop 1I located in the case i, the end surface 12 of the spring holders 5 and is fixed on it symmetrically on both sides. In this case, the loop 1 1 is capable of contacting the supporting surface 6 of the groove 4. In this case, the upper part of the spring holder 5 has a T-shaped protrusion 13, which serves as a gripper when installing and removing the spring holder from the brush holder.

The device works as follows.

To bring into working position, t, e, to the position in which the rear axle; there is a sliding contact between the grids 14 with the surface of the collector 15 or the slip ring, the operator inserts the electro-brushes 14 into the holder 9 of the brush holder and, holding the spring holder 5 by the T-shaped

the protrusion 13, inserts its bar 8 into the groove 4 in the wall 3 of the housing 1 of the brush holder up to the stop with a spring loop 1 against the thrust surface 6 of the groove 4, and the coil springs 10 unwind, resting on the ends of the electro-brush 14.

Further introduction of the strip 8 is accompanied by the elastic deformation of the spring hinge 11 and the insertion of the stopper 9 into the support slots 7 of the wall 3 of the brush holder housing. In this position, the pressure mechanism formed by the springs 10 with the spring holder 5 is elastically fixed in the groove 4 and provides almost equal efforts to press both electric brushes against the collector or slip ring of the electric machine. Removing the pressure mechanism when changing the electrical brushes is carried out in reverse order.

respectability. I

The invention allows a more complete use of the resource of the electrobrushes while replacing them at the same time, which is caused by an increase in the uniformity of pressing the brushes due to the use of one spring of the tape for the pressure springs, i. E. using springs with the closest power characteristics, as well as ensuring the elastic fixing of the pressure mechanism.

Such an independent elastic fixing of the pressure mechanism in the brush holder, ensured by using a loop of elastic tape as a support element of the spring holder, reduces the effect of radial and tangentially directed perturbations on the working areas (spring section between the roll and the strapped part of the tape) of the constant pressure rolls that occur during the passage of the irregularities of the collector with the electric brush, which also increases the uniformity of pressing the brushes, and also allows to simplify the maintenance of large machines operating in a lightweight mode (for example, when idle run turbogenerators, when using a smaller number of equipped

electrical current collector assemblies), since it does not require the necessary removal and storage of inactive pressure mechanisms.

Claims (1)

Invention Formula A brush holder for an electric machine, comprising a housing with two brush clips having a common wall, and two pressure constant pressure coil springs; connected to a spring holder placed between the clips, characterized in that, in order to increase the uniformity of pressing the brushes, the pressure roll springs are made of a single spring strap, which around its middle part with the formation of an elastic loop, the end surface of the spring-holder located in the housing is fixed on the spring-holder symmetrically on both sides, which is made in the form of a strip with side steps-clamps, with the help of which the spring-holder bar is installed in the slot made for it in the common the housing wall with the possibility of contacting the elastic loop with the supporting surface of the groove. fO figure 1 h v .g FIG. 3 07 // Vl / J 8 9 V) ig.6