Method of calculating the current wheel-motor blocks during emergency operation traction motors
The article analyzes the log data form TU-92 service locomotive depot «Sverdlovsk» for three months in 2016, which showed that the main bearing defects occur in electric burns roller surfaces. In order to identify the causes of elektroozhogov analyzed emergency operation of the traction motor. An analysis is made of the current distribution diagram of a wheeled motor unit. It is noted that the above diagram shows only the current path in the general form and does not allow to obtain quantitative characteristics of the current load of the bearing assemblies. A method for calculating the current distribution in the wheel-motor unit during emergency operation modes traction motor, allows to take into account the volume of the current spreading in the electric traction drive elements. With the proposed technique composed equivalent circuit of the traction motor in the breakdown of insulation and heat with a circular arc to transfer to the end shield. Verifying simulation re-sults performed by the pro-grams Multisim and Comsol Multifisics, showed that when the current distribution in the core study error is not more than 6 %, and in the case of the arc was transferred to the bearing plate - not more than 0,2 %. Investigation of the proposed equivalent circuits in the Multisim program has shown that the breakdown of the insulation the largest current flows through the motor-anchor and motor-axial bearings, and in the case of the arc to transfer to the bearing shield and a larger current flows through the motor-axial bearings. It revealed that the com-plex geometry of the armature and the core of the traction motor is not substantially affect the current distribution. The magnitude of the currents is significantly influenced by the transitional resistance of the bearings and gearing.