Abstract
Objective: The assessment of energy effectiveness of traction drives for carriages of rolling stock models 81-765/766/767 and 81-556/557/558 (“NEVA”) from various producers and drafting technical requirements for drive electric equipment. Stock 81-765/766/767 uses asynchronous engine of 170 kW wattage and 43 Hz field rated frequency, 81-556/557/558 — 167 kW with 70 Hz rated frequency. Methods: The comparative analysis of drive energy indicators of trains with asynchronous electric drives has been accomplished in accordance with the calculation methodology. Measuring section was set in accordance with GOST P 50850-96. There are defined the assumptions at motion of rolling stock with equal maximal acceleration in a runaway and maximal deceleration in a braking and constant deceleration in a run-out. Maximal acceleration and deceleration were calculated incompliance adhesion set coefficient, grip weight (mass of motor cars) and moment of inertia. The calculation by method of analytical integration of motion differential equation was held on runaway five intervals. Initial technical data of trains with rated load as well as calculated indicators at train motion on measuring section were accepted. Diagrams of train motion on section were built and comparative analysis of characteristics of stock carriage models 81-765/766/767 and 81-556/557/558 (“NEVA”) was pursued. Results: It was established during the comparison that engine overload by torque on shaft is the same with 1.5 coefficient to rated torque. Stocks have significantly different indicators as by unit expenses as well as by motion dynamics. It’s been also established that for to minimize energy costs for traction it’s required to develop maximally allowable deceleration at braking and maximally allowable acceleration at runaway. Practical importance: The necessity of entry into Technical Task for new rolling stock of the requirement on stock check on runaway possibility with maximal set acceleration.
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