Burdilna Y. Interconnected electrical complex of frequency-controlled electric drives of grain thrower mechanisms

The dissertation is devoted to solving the problem of reducing injury and damage to grain during post-harvest processing, which negatively affects both the ability for long-term storage and resistance to diseases and pests, and the future yield and quality of harvested grain crops in general. The dissertation analyzes the existing methods and approaches to reducing grain injuries during its transportation, which consist in changing the mechanical part of grain throwers and / or using elastic materials on the contact surfaces of grain with the working bodies of the machine. It is proposed to change the design of the grain thrower by removing the guide nose and modernizing the electromechanical system of the unit by introducing a frequency-controlled electric drive of the conveyor. This will allow setting the required speed of the conveyor belt and, accordingly, the trajectory of the grain flow. Ensuring the accuracy of the landing of grain is achieved due to the additionally created directed wind flow, the speed of which will depend on the type of transported grain and the speed of the conveyor belt of the grain thrower. As a result of the research, a method has been developed for the implementation of the required ballistic flight path of the grain flow by regulating the speed of the conveyor. A method of coordinated control of independent electric drives of the conveyor and blower fan based on a fuzzy controller is proposed. To correct the problem for the corresponding frequency-controlled electric drives when the distance and the spread of the grain flow change under the conditions of the existing setting and disturbing influences.. The ways of realization of the developed methods and control algorithms as a part of the automatic microprocessor system of the electrotechnical complex of the grain thrower are determined. The reliability of the theoretical positions obtained in the dissertation is confirmed by the results of mathematical modeling, experimental research and testing in industry.