Determination of the Characteristic Points of Approximation for Traction Electric Machines of Electric Rolling Stock

Abstract

The paper presents a new approach to the selection of characteristic points on the current-voltage curve (CVC) of the brush contact of traction electric machines, for their approximation in the form of three different functions, with characteristic points of transition to the field weakening mode. The problem of raising resources by using new design electro brushes. This constructive solution is consistent with the specific types of traction motors used in urban and rail transport and satisfies the technical conditions for their operation. A construction brush holders, which will save the cost of electro, in connection with their wear and tear due to friction on the walls of the brush holders. Improving the quality of machines saves material means and human resources, increase the profitability of their use, resulting in a significant increase in productivity. The method of calculating the current-voltage characteristics of a new type electro brushes, the distinguishing feature of which is the introduction of a cross section of the body brush. In the course of the experiment revealed steadily increasing rate of proposed electro brushes, compared with the standard of the same type EG61A. Data collected during the experiment showed that electro brushes with a transverse incision is more stable contact with the collector.

Increasing the Efficiency of Diagnostics in the Brush-Commutator Assembly of a Direct Current Electric Motor

“…To determine the value of the actual residual life, it was proposed to use vibration diagnostics to determine the life of the actual brush rather than the average statistical one. The design of the ED 131 and ED 131A for 120 t dump trucks assumes that they are installed directly in the hub of the motor-wheel according to the design scheme used in foreign dump trucks, such as in the USA and Japan [10]. Since the all-wheel drive chassis on a BelAZ-7550 truck contains two driving axles and, accordingly, four TEMs M1-M4, the windings of the traction generator G1 are loaded on two identical sequential circuits, containing TEM M l, M2 front-and M3, M4 rear-driving axles.…”

“…Most types of damage can be identified on the basis of their characteristic frequency components [13,14]. The vibrodiagnostic monitoring method [10,11] is based on vibration measurement with piezoelectrodes or lasers to measure the vibrations in the electric motor. Industrial accelerometers are attached to the place of measurement for a few minutes.…”

“…Industrial accelerometers are attached to the place of measurement for a few minutes. Then, the received signals are converted from analog to digital form with the help of an analog-to-digital converter, and then the vibration spectra are formed with the help of a computer, then the spectral analysis is performed and a conclusion on the presence of The vibrodiagnostic monitoring method [10,11] is based on vibration measurement with piezoelectrodes or lasers to measure the vibrations in the electric motor. Industrial accelerometers are attached to the place of measurement for a few minutes.…”