| Popis: |
The purpose of the work is the import substitution of traction electric drives as part of the project to create in the Chuvash Republic a serial production of a family of front loaders with a hybrid electric drive. For most transport electric motors, operation in the high-torque electric motor mode is not the main operating mode, since the vehicle acceleration is carried out in a short time with overcoming low-efficiency low-speed modes. A distinctive feature of the traction motor for the chassis of a front loader is the rearrangement of priorities in favor of operating technological modes. The analytical results of the stage of the preliminary design of the traction electric motor of each wheel for a front loader with a hybrid electric transmission are presented. Based on the results of calculations, it was found that for the given traction-dynamic, temperature and overall characteristics, the most efficient type of engine is NdFeB magnet motor, the phase ratio is 6, the magnetic system is radial with magnetic supports, the non-magnetic gap is 3 mm, the shroud is based on a carbon filament, cooling is forced liquid, the highest efficiency of 92% falls on the cycle of heavy operating modes of the front loader. The cost of manufacturing a motor with an axial magnetic system is higher compared to cylindrical type motors provided the electromagnetic power is equal. The choice of a magnetic system based on the ratio of magnetic fluxes of different combinations of rotor poles and stator teeth is substantiated. The materials of the article illustrate diagrams of magnetic fields and temperature distribution of the traction motor, calculated at the stage of preliminary design by the finite element method, as well as a dimensional drawing of a sketch of an electric motor for given performance characteristics, transferred to the stage of technical design. |
