SU601769A1 - Contact material - Google Patents

Description

(54) CONTACT MATERIAL specific pressure 2OOOggs / mm pressing temperature pressing 2OO-21OS; Exposure2 min. Received | B1e blanks are machined. The finished brushes are if6 X 2 X 8 mm in size. According to a similar technology, the brackets with a different percentage ratio of the components of the brushes from known and proposed compositions were performed under normal conditions and vacuum mm, Hg at temperatures -1OO ° C and + 1OOC at the speed of rotation of the SSLO, rpm and current density Yu. a / cm. The results of tests for wear resistance are given in table 1. As follows from the above data, brushes of the proposed material under normal conditions of high vacuum have wear resistance that is 1.5–7 times greater than the wear resistance of brushes made of a known material and a higher stability of the voltage drop. Increasing the wear resistance of the bars makes it possible to increase the service life of electric machines and thereby reduce the number of manufactured products. In tab. Table 2 shows the stability of the transient voltage drop. Table 1

Limits of Transitional Changes

voltage drop (2d)

for a period of 25 hours, volt

Limits of transition voltage drop (2d) at steady state over the last 7 hours of operation, volts

Limits of Transitional Changes

voltage drop (2AU)

for a period of 25 hours, volt

 Contact material including graphite sulphon stinker, silver, phenrvormalpegipnu mix, characterized in that, in order to increase the wear resistance and stability nepexoiiioro voltage drop and expansion of the range of the brushes, it additionally contains chromium oxide in

Graphite15-40

Tungsten Disulfide25-50

Chromium oxide3-15

Continued table. 2

Limits iamevenven transient voltage drop {2di) at steady state over the last 7 hours of operation, volt

Phenolfs Mbshdegndna resin9-13

SilverEverything Else.

Sources of information taken into consideration, manna during examination:

1. For the sake of M 1969894, cl. H 01 H I / O 1973, according to which a positive decision was taken to issue an author's certificate,

2. Report NI 2040. Development of electrodes for electric motors with an improved service life under conditions of the influence of Kuum, Elektrougli, 1975.