Maintenance and technology of producing contacts of electromagnetic starters using research contact materials based on copper
DOI:
https://doi.org/10.31548/energiya2019.05.116Abstract
Abstract. The requirements for the maintenance and repair of electromagnetic starters using developed contact materials based on copper with impurities of metals and other thermodynamically stable compounds are given.
The repair technology has been developed and the main components of the technology for manufacturing contacts by powder metallurgy are described. When restoring the contacts of PML starters, an installation was used for soldering and welding of contacts by the electric support method and the method of induction heating. Special equipment was used for the technological process: a resistance welding machine of the MTP 2402 type and installation of high-frequency currents of the RFI type 2. For welding, brazing alloys based on copper of the MFSu type are used. The selection of approximate modes and norms of time of welding and soldering of contacts on specialized equipment was carried out.
A study of the reliability indicators of the starter for electrical discharge erosion and the determination of transient contact resistance. Based on the results of the research, the dependences of the electroerosive wear of the research contact parts from various materials for the contact system of PML starters depending on the number of switching are constructed. When determining the transient contact resistance of the restored contacts, the ammeter-voltmeter method was used. An array of voltage drop data was processed using mathematical statistics methods using the «Statistika» software.
According to the results of the study, it can be stated that for composite contact materials from which contact details with the necessary service properties are made, a composite material based on copper is suitable, the components of which are metals, oxides, and thermodynamically stable compounds.
Key words: reliability, maintenance, repair cycle, overhaul period, contact system, contact part, contact material, electrical erosion, transition resistance, contact failure, contact solution, contact pressure, insulation resistance
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