SU1594442A1 - Apparatus for measuring contact resistance of sliding contact pairs - Google Patents

Abstract

The invention relates to a pulse technique and can be used to measure transient resistances of a group of sliding contact pairs with moving (rotating) leads. The purpose of the invention is to increase accuracy with a small number of sliding contact pairs. The device contains reference current sources 1.2, switch 3, first and second groups 4 and 5, N terminals for connecting measured N sliding contact pairs, measuring device 6, switches 7.8 for resistors 9, analog totalizers 10.11, measuring These are N sliding contact pairs 12 and 13. There is no method component in this device. 2 Il.

Description

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The invention relates to the field of measuring electrical circuit parameters and can be used to measure transient resistances of a group of sliding contact pairs that have moving (rotating) terminals.

The aim of the invention is to improve the accuracy with a small number of sliding contact pairs.

FIG. Figure 1 shows a structural electrical circuit for measuring transient resistance of sliding contact pairs; see 2- Equivalent device replacement scheme for measuring transient resistance of sliding contact pairs.

A device for measuring the transient resistance of sliding conical pairs contains a first source

 1 reference current, second reference current source 2, first switch 3, first 4 and second 5 groups of N terminals, which are terminals for connecting the measured N sliding Contact pairs, measuring with .set 6, second switch 7, third switch 8, N resistors 9, First 10 and second 11 analog summators, measured by N sliding contact pairs, respectively 12 and 13.

The positive polarity of the first reference current source 1 through the second switch 7, and the negative polarity selection of the second reference current source 2 through the third switch 8 are connected respectively to the first 4 and second 5 groups of N terminals, which are terminals for connecting the measured N Sliding contact pairs, respectively, 12 and 13, and to the N inputs of the first 10 and N inputs of the second 11 analog adders, the outputs of which through the first switch 3 are connected to the first output terminal of the measuring instrument 6, the second terminal The meter output 6 is connected to the common circuit of the first 1 and second 2 reference current sources, the first 4 and the second 5 groups of N terminals are connected to No. 1, respectively, through N registers, rotating the outputs of the measured N sliding contact pairs 12 and 13 are connected between by myself.

,

A device for measuring the transition resistance of sliding contact pairs. works as follows.

In each iM (i 1,..,, N) position of switches 7 and 8, the voltages U and Uj are measured at measuring device 6. At the same time, the measured N sliding contact pairs are connected with fixed terminals to the first 4 and The second 5 groups of memory N clips.

For each measured sliding contact pair, one after another, the second 7 and third 8 switches are supplied with voltage from the first 1 and second 2 sources of the reference current. At the same time, the remaining N 1 of the first 4 and second 5 groups of N terminals are disconnected from the first 1 and second 2 sources of the reference current. The first switch 3 provides alternate connection of the measuring device a 6 to the outputs of the first 10 and second 11 analog summs of 1 switches.

The values of the measured transient resistances R and R.j of sliding contact pairs are determined by the formulas

and .. (N - 2) -

JTiCN - o

U; N - u (N - 2)

where K is the scale factor of analog adders (usuallyK 1,

at K 7 1 sous: 1, the formation will be carried out with amplification);

I is the current formulated by the first 1 and second 2 sources of the reference current.

The N resistors 9 ensure the normal operation of the device for measuring the transition resistance of the sliding contact pairs in the event of a break in one of the slip chains of all contact pairs 12 and 13.

The resistance of the RN resistors 9 is selected from the condition

RH 6.AC

where К „is the nominal transient resistance of sliding contact pairs;

 ex AC input impedance of the analog adder.

Claims (1)

A device for measuring transient resistance of sliding contact pairs, containing in series the first and second sources of reference current, to the common circuit of which are connected in series the measuring units (the device and the first output of the first switch, the first and second groups N (where N is an integer) of terminals for connecting the measured N sliding contact pairs, sliding chains which are 5 combined, characterized in that, in order to increase accuracy with a small number contact pairs, the second and third switches are introduced, the first and 20 second analog adders and N resistors, the first terminals of the second and third switches, respectively, are connected to the positive and negative terminals of the first and second 25 reference current sources, and the remaining N pins of the second and third switches, respectively, are connected to the first and second group of N terminals for connecting the measured 30 N sliding contact pairs, the sliding contacts of which are combined, N inputs of the first and second analog adders are respectively connected to the N pins of the second and third switches and respectively to the N first pins and N second pins of N resistors, the outputs of the first and second analog adders are connected respectively to the first and second · 1