Osłabianie strumienia magnetycznego w trakcyjnych silnikach indukcyjnych

Selection of the AC motor for traction applications depends strongly on economical reasons. That means, that it is important to keep the dynamical performance of the vehicle as well as possible but the low price of the drive is also required. Usually the compromise in this choice is achieved thanks to the selection of the AC drive nominal parameters corresponding to the middle velocities of the vehicle. Unfortunately, during the motor operation with higher velocities we observe then the lack of the voltage necessary for effective driving. The aim of this paper is to show the procedure of selection of 165kW AC motor for trolley-bus drive. There are given some reasons for choosing of the motor nominal data which do not correspond to the high speed working region. On the example of trolley-bus drive in Lublin it is shown how to adjust the reference frame for demanded flux vector and an algorithm which enables the drive control in the flux weakening region is also described.