摘要：The object of the study is the process of appearing an electromagnetic moment in traction motors of combined excitation of a trolleybus at synchronous inclusion of both components of the excitation system. This process is formally presented as mechanical characteristics – dependence of an electromagnetic moment of the motor from excitation currents.One of most problem points is to determine the influence of excitation currents of the series and separate winding on an electromagnetic moment of the motor as a continuous dependence that allows to create a system of managing the traction drive with DC-DC excitation transformer. Peculiarities of the motor magnetic system are also taken into account.During the study there was used the method of finite elements in the flat-parallel target setting of calculating moments by the results of calculating the magnetic field with the further regression analysis of results of digital experiments using Chebyshev polynomials on the set of equidistant points.There was received the continuous dependence of an electromagnetic moment from excitation currents as a polynomial that can be used both at creating managing systems DC-DC by the excitation transformer and at modeling operation modes of the traction drive as a whole. It is connected with the fact that the offered polynomial type has a continuous type dependency and its derivatives at all possible values of currents at the drive work. According to the results of the regression analysis, the maximal deviation of calculated dependencies doesn’t exceed 0,052, and mean deviation is no more 0,041. It proves the adequacy of the received dependencies to the results of the digital experiment on determining an electromagnetic moment.Due to it, there is provided the possibility of modeling operation modes of the traction drive based on the motor with combined excitation and DC-DC transformer. The managing system parameters, received by modeling results, allow to raise energetic characteristics of trolleybuses. Comparing with analogous known systems, it provides more rational use of electric energy on thrust of the rolling stock.
关键词：mechanical characteristics;traction drive;combined excitation;method of finite elements
