Вестник ЮУрГУ. Серия «Энергетика». 2015. Т. 15, № 2. С. 41-48 Electric traction drive is the critical part of the equipment of all electric or hybrid haulers. It imposes wide range of requirements to the power facilities, control system parameters and output performance of the full electromechanical complex. As hauler drives often work in extreme mode, it is necessary to form energy efficiency criteria of the drive in another way [1, 2] . The existing solutions of the electric drives on the

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... of asynchronous motor or synchronous reluctance machine (SynRM) do not meet such requirements. Asynchronous motors have the optimized construction, winding performance, insulation materials and power supply. Nevertheless, the overload indexes are not high. Increasing the current loading and sophisticating the SynRM construction can provide the rated torque equal to 1.1 of the asynchronous drive rated torque. Ample scientific works [3-6] are connected with optimization of the electromechanical converter. However, the proposed solutions are oriented to the bridge m-phase inverters supply with the limited number of phases. The new approach to the electric drive designing provides for improving overload and weight-size ratings. The "valve-inverter -motor" complex optimization would be made with due account for special electric traction drive requirements as high overload usage possibility (e.g. for overtaking or for starting with heavy cargo); as minimal dimensions (e.g. for urban electric transport with low floor for convenient passenger drop-off and pick-up), by the example of the field regulated reluctance machine (FRRM). Concept and operating principles of the FRRM FRRM is the synchronous reluctance machine where the stator winding can behave as field winding if the coil is over the interpolar space and it is a full pitch winding. Such drive works as the inversed DC machine. Stator windings can be fed by the independent sources or by the traditional multiphase controlled power converters, e.g. based on the full bridge circuit. As the rotor may be done massive, high mechanical stiffness of the shaft can be achieved. Motor can be made in the same stator housing as the induction motor, and applying the same stator line current load FRRM develops torque greater by 20...35 %. By virtue of intentional true neutral plane displacement to the pole edge, the motor can produce overload torque up to 4...10 rated values [7-9]. The paper considers electric traction drive with the field regulated reluctance machine (FRRM). The FRRM principles of operation and main advantages compared with asynchronous machine and synchronous reluctance machine are presented, disadvantages are marked. Mathematical model of the drive with FRRM is described; adequate accuracy is proved by the statistical data processing. The paper presents electric drive operating point determination in the static mode, transient model analysis, which takes into account electrical, electromechanical and mechanical processes of electric traction drive, present the first stage of optimization. The second step explains a method of increasing the maximum speed of the drive. The third stage is associated with optimization of FRRM features with over-torque. Therefore, the drive is obtained with improved weight and dimension characteristics, overload capacity, which meets the requirements of the haulers. Weight-size parameters optimization, three-stage characteristics optimization estimate the most favorable parameters of the control system and the motor. The explanatory drawings are given in the article.