The Influence of Agricultural Production Factors on the Rate of Changing the Radial Clearance in the Electric Motor Bearings When Working with V-belt Transmission

Abstract

AbstractThe paper considers the regularity of changing the wear rate of asynchronous motor bearings under operating conditions which are typical for agricultural production premises. The radial clearance is selected as a parameter that determines the bearing performance; it is normalized in the reference literature for rolling bearings. Harsh environmental conditions and a high utilization rate of asynchronous motors in electrified processes of agro-industrial production result in an annual failure (about 20–25%) of the electric motor fleet. Bearing wear is noted to be the main cause of motor failure apart from damage to winding. As a result of the literature analysis and using the method of expert evaluations, the statistical characteristics of the deteriorating environmental factors for the main types of agricultural premises were specified. The authors have developed a bench that makes it possible to simulate the electric motor operation typical for agricultural production environments under laboratory conditions. Bench tests for studying the rate of changing the radial clearance were carried out using the asynchronous motor (the 6A80B2Y3 brand) which has a drive of a working machine with a V-belt transmission. The load value on the motor shaft was constant at the level of 10 kgf. Experimental studies were based on the theory of planning a multivariate experiment. The choice of a plan for a full three-factor factorial experiment has been substantiated. Relative air humidity, dust, and ammonia content were selected as wear factors. The result of the research was the polynomial dependence of the changing rate of the bearing radial clearance on the selected factors.KeywordsAsynchronous motorV-belt transmissionBearingRadial clearanceBench tests