Study of the influence of electric transmission parameters on the efficiency of freight rolling stock of direct current

Statistical analysis of locomotives traction motors performance

“…We found that the crucial influence on current distribution at the power circuits is caused by such factors as velocity performance of traction electric motors, surfaces wheels rolling wage wheels diameters, resistance of the electric motors electric coils [7][8][9].…”

Improvement of the model of power losses in the pulsed current traction motor in an electric locomotive

“…where n is the motor shaft rotation frequency, 1/s; D=1.25 is the wheel diameter, m; µ=88:21 is the gear ratio; k P =0.975 is the gear efficiency [25]. Then the motor shaft rotation frequency is 60 .…”

“…In addition, when choosing an approximating function, in addition to the high accuracy of the approximation, it is necessary to take into consideration the simplicity of implementing an approximating function. These requirements are met by the mathematical model of the reduced EMF, which takes the following form (25) where р 1 , р 2 , р 3 are the coefficients of approximation. The dependences Е/n(І ех ) and n(І ех ) are shown in Fig.…”

“…The coefficients in equations Н с , K hyst , and K addy (4) were determined for the specific power losses expressed in Wt/kg. To move to the losses expressed in W, equations (25) and (26) are multiplied by the weight of steel of the corresponding structural element of the motor. The weight of the steel of the structural element is determined from the following expression…”

Development of a comprehensive approach to determining the rational parameters of an onboard capacitive energy accumulator for a subway train

“…Papers [17,18] suggest determining an onboard CEA's settings by using the theoretical basics of electrical engineering, subject to the conditions, the main of which is that there should be an aperiodic or boundary CEA discharge mode. A major drawback of this approach is the limited scope of application.…”