Abstract
For heavy construction equipment with a hybrid electric transmission, the power center of a group of traction electric drives can be formed by an electric generator and a renewable energy storage device (battery array) with the possibility of their joint operation to provide a surge of current in a group of traction electric drives. The battery array can be used to power a generator in a starter mode when starting a diesel internal combustion engine.
 
 The purpose of the study is to substantiate the choice of the magnetic system of the power generator for the electric transmission and the possibility of a starter mode for an internal combustion engine drive. The study was carried out within the framework of a subsidized project to create mass production of a family of front loaders with a hybrid electric drive in Chuvashia.
 
 Materials and research methods. The studies were carried out by the method of finite element analysis using the Russian software ELCUT (professional version and a set of reference books for domestic electrical and magnetic materials).
 
 Results. The stage of analytical calculation of the active parts of a transmission electric generator for the preliminary design stage is presented. It was carried out for the following conditions: the use of Russian electrical and magnetic materials, the use of common industrial bearings and antifreeze, compatibility with existing technological equipment in the production of traction electric motors, engine mode for performing the starter function. The substantiation of the choice of the magnetic system based on the ratios of magnetic fluxes of different sizes of stator teeth is given. The article is illustrated with diagrams of magnetic and thermal fields for given operational characteristics and properties of a transmission electric generator.
 
 Conclusions. For a given type of drive diesel engines installed on the front loaders, the highest efficiency indicators of the proposed generator magnetic system occur when using a multiplier. The power supply of the generator in the starter mode is provided by the installed array of traction batteries of the front loader without additional step-up converters.
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