Electric Friction

Posted by Neil P. Herzog in Electric
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Electric Friction

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Chapter 30 FRICTION AND WEAR OF ELECTRIC CONTACTS 30.1. MAIN DEFINITIONS. PHYSICAL PRINCIPLES OF PROCESSES IN ELECTRIC CONTACTS An electric contact is a junction of two conductors (usually solids) brought into engagement for transmitting an electric current. All electric contacts can be classified according to their function, kinematics, and design features (Fig. 30.1). With two solids touching each other to create an electric contact, the real area of contact that Friction processes with current collection were chosen as an example because this type of process is widely used and is of importance for practical applications (such as electric motors, generators, etc.). The selforganization of friction with current collection is of

interest.because there are two independently controlled processes that are operating within the system: friction and the passage of an electric current through the contact. In the other tribosystems, as well as in tribosystems with The presence of stable polish layers of definite composition on the collector surface makes it possible not only to improve and stabilize electrical contact, but also to obtain a sharp increase in the wear resistance of the brush when the collector assembly operates in air, when the ambient medium possesses high variable humidity, in conditions where a marine atmosphere acts on the brushes, and also when they operate in vacuo. The composition and quantity of antifrictional additives Wear of Sliding

Electrical.Contacts Wear of SEC results from mechanical and electrical actions. However, mechanical and electrical processes in SEC are closely interrelated, for instance, electric erosion caused by electric current, increases the roughness, thus, spurring mechanical wear; at the same time, mechanical damage of the surface can increase the electric component of wear. In friction process three periods can be distinguished: runin, steady wear, and catastrophic wear.the six parameter model of the friction can be represented through a single parameter appearing linearly in the dynamics. The stability results were achieved by guaranteeing strict positive real conditions on a certain closedloop transfer function. The results obtained in [44]

were.further extended in [161]. Friction compensation in servodrives with compliant transmission was considered in [90, 175] using the LundGren dynamic friction model. The properties of this model were utilized Holmberg et al. (2012) claim that onethird of the fuel energy in a conventional ICEV is used to overcome mechanical friction losses. These friction losses include friction between moving parts in the engine, gears, bearings, seals, forks, transmission, tyres, and brakes. Viscous losses in the oil tank are additionally considered under friction losses. When braking is excluded, 28% of fuel energy is lost to direct friction losses aforementioned (Holmberg et al., 2012). These losses, excluding Some effort is made to

understand.the mechanism which is responsible for the observed increase in friction. It appears that the increase results from an additional electrical force which supplements the normal force on the real area of contact. An alternative explanation based upon rise in the intrinsic coefficient of friction is thought to be less plausible. In order to elucidate the details of the mechanism, certain experiments have been performed. An electrical model of the contacting The second part of the chapter deals with the surface temperatures developed between nonconducting solids, where the thermoelectric method is inapplicable. SURFACE TEMPERATURE OF SLIDING METALS Calculation of Surface Temperature Consider a cylinder whose face slides over a

surface.with a velocity of v cm. per second (Fig. 13). If all the frictional work is liberated as heat, then the amount Q of heat developed is given by Q = *i g calories per second, (1) where p 

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