EURO-ECO 2008 Hanover 18 - 20 November 2008	Environmental and Engineering Aspects for sustainable living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover University of Bremen, Bremen

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In the world a considerable quantity of electromechanical converters of energy with systems of sliding current collector device (SSC) is produced now. The most widespread kind of an electrical sliding contact is a pair of -friction (either a brush- collector or a brush-contact ring). Therefore there is an acute problem of reducing the wear of brushes in driving sliding contacts. The wear of collectors and rings is tar less than electrical brushes. There are various methods of reducing the wear. For example, the use of rigid lubricants with double sulfide of molybdenum is considered one of the most effective methods. However while using SSC it is necessary to take into account not only physical-chemical but also electrical singularities of covers of double sulfide of molybdenum. Known researches were mainly directed to bring lubricants into the element composition of a pair of friction.

In this direction SSC frequently work at the effect of an electrical arc (sparking) and local dot overheatings, that direction is not perspective. The authors comprehensively investigated and worked out the lubricant with double sulfide of molybdenum in the form of a brick of rigid lubricant set on the contact track as an additional brush located separately from the working brush.

The application of this engineering solution on air starter-generators by power of 12 KW allowed for reducing the wear of metal-graphite brushes in a starter regime by 2.5 times.

The use of additional brushes with the double sulfide of molybdenum in the collector electric motor (AC) by power of 150 W which is used to drive a household pump, apart from reducing the wear of metal-graphite brushes by 30-50% resulted in a drop of a sparking level by 1/2 numbers.

The application of an additional double sulfide of molybdenum brush in the collector motor of an alternating current by power 1.2 KW resulted in reducing the wear of working brushes by 3070% At the same time reducing of a local of radio noise by 12-20 dB at the frequencies of 6-30 MHz happened too. The application of double sulfide of molybdenum in SSC of asynchronous electric motors with a phase by at rotor let reduce the wear of brushes by 2-3 times nominal loads. In this case, the spectrum of upper harmonics induced in the rotor essentially reduced.

As the results of these investigations the mathematical models permitting to predict the wear of electrobrushes at application of double sulfide of molybdenum have been composed.