Обґрунтування виборки при експериментальних випробуваннях дослідних контактів електромагнітних пускачів

Abstract

BACKGROUND SAMPLE IN EXPERIMENTAL RESEARCH TEST CONTACTS ELECTROMAGNETIC STARTERS

Since the reliability of electromagnetic actuators with developed research contacts involves saving time parameters characterizing the properties of electromagnetic actuators carry out their functions in all prescribed regulations and demanding conditions (environmental conditions technological livestock buildings), the reliability monitored in all trials, while controlling operation starter and when tested on the impact of external factors (control tests).

The purpose of the study - to determine a plan to test the reliability and the required amount of objects during testing actuators with research contacts based on copper.

Materials and methods of research. When planning reliability testing necessary to determine the plan. Accepted test plan [NUT] - test plan whereby simultaneously test the N objects, objects that were denied during the test, not reduced and not replaced, the test is stopped after the time trials or operating time T for each object which is not denied. In terms of testing to understand the plan [NUT] - the number of objects N (number of poles starters) in the sample and the test duration T (number of switching cycles, thousand).

In order to reduce the time and resources used single stage control test in which a sample tested (based test which decides on compliance with reliability).

Research results. In determining the sample size out of acceptable error in assessing the reliability of experimental parameters, depending on the variation of parameters most starters. The scope of these variations can be determined using the results of earlier trials serial starters. According to the research intensity electrical wear the weakest link is movable bridge. On the basis of mathematical treatment can be defined in relative units (ru) values erosive wear bridge and results of research determining this value. To present these data in acting, they should compare with the theoretically derived masses.

This value corresponds to the number of objects in a sample of N = 7. Generally, accepted for testing a sample of 8 devices in which there are 24 poles.

Conclusions

1. Plan Selects reliability tests - [NUT]. As a result of the replacement serial contact material on research conducted type testing three pole starters in the number 8 pcs. This indicator reliability test results will be g = 0,95.

2. In order to determine the technical parameters of starters from research contacts and objective evaluation of the technical level of these starters, should the test program for starters:

-   testing of starters from research materials in contact wear resistance switching application category AC-3;

-   test actuators with research materials for a nominal switching capacity of contacts of the main range of application category AC-3;

-   research contact resistance starters with serial and research contacts;

-   operational test production of starters developed contacts.