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Copyright of Electronic Processing of Materials / Elektronnaya Obrabotka Materialov is the property of Institute of Applied Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electronic Processing of Materials / Elektronnaya Obrabotka Materialov is the property of Institute of Applied Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Purpose. Development of mathematical model of asynchronous traction machines in (d, q) frame of axis with taking into account the saturation of magnetic circuits. Methodology. In the paper, we used the method of dynamic inductances, which is connected with the use of a systematic study of properties of the traction motor. Findings. We have designed the analytical model of magnetic circuit asynchronous traction motor which takes into account action of the tangential and radial dynamic inductances. Based on this we have built tensor dynamic inductances rich machine, which was recorded in (d, q) frame of axis of equations of rotor and stator circles asynchronous traction motor taking into account the saturation. We suggest the method of dynamic inductances for construction of mathematical models of traction asynchronous engine. This allows to take into account the saturation of the main magnetic path for the modes with a wide range of changes in the flow of mutual induction between the stator and the rotor; saturation flow path scattering modes that are characterized by large current circuits of the machine; induction caused by processes of saturation between mutually perpendicular to the contours of the machine; as well as the joint saturation worker thread and threads scattering modes that are characterized by the significant size of the workflow and large values of currents contours of the machine. These modes are specific to asynchronous traction machines with consideration of the operation mode of traction electric rolling stock of Railways. Originality. We have considered variations in the magnetic state of traction induction motor, which is a topical issue in view of such a change in a wide range of operating modes of traction electric rolling stock of Railways. Practical value. The mathematical model allows taking into account the change of the magnetic state of asynchronous traction motor. It is required for creation of adequate drives control systems and systems for driving traction electric rolling stock of Railways. [ABSTRACT FROM AUTHOR]

Considered switching processes in the three-phase transformers with various configurations of winding connections in the absence of the power supply system of the neutral conductor. Visual simulation of transient processes is done with MATLAB and proposes measures to minimize the duration of the processes of. Means of visual simulation shows the dependence of decay processes residual magnetic flux in three-phase transformers, depending on the connection scheme. Attention is drawn to that disabling the transformer thyristor switcher accompanied by saturation of its magnetic circuit. Inertial nature of the magnetic flux decline is an obstacle to the next, fast time, connect the transformer to the mains. Patching, a system of three-phase transformer is not expected to reduce the magnetic flux to zero and not allowing inrush current in its windings. Presented a visual model of the proposed switching system and describes in detail the principle of its work. [ABSTRACT FROM AUTHOR]