Palchykov O. Optimization of Technical Level of Induction Electromechanical and Static Converters with a Rotating Magnetic Field

Object of study: optimization design of induction energy converters with a rotating magnetic field. Purpose of research: optimization of technical level indications and comparison of electromagnetic system variants of induction motors and transformers with a rotating magnetic field for producing an induction converter with the best mass, power and starting (for motors) characteristics. Methods of research: the theoretical base of thesis is methods: the theory of induction converters with a rotating magnetic field, the separation of the relative optimizing geometric components from the target functions of indications of electromagnetic system, the optimization theory, the approximation theory. Confirmation of basic theoretical results is based on the results of tests and production of special induction motors with an external rotor and an axial air gap. Theoretical and practical results: it has been established, that the cost and the active power losses of electromagnetic system of induction motor with an external rotor are reduced by 7,0-12,9 % and 5,3-26,4 % respectively as compared with an equivalent induction motor with an internal rotor. It has been determined, that the mass and the cost of electromagnetic system of axial induction motor are reduced by 1,7-19,9 % and 1,3-24,6 % respectively as compared with an equivalent induction motor with an internal rotor. It has been established, that the axial transformer converter with trapezoidal sections of yoke is expediently used for electrical systems and complexes with high requirements to the quality of electric power, and radial design is expediently used for welding transformers with a steeply falling external characteristic. It has been proved, that the sectioning of induction motors ensures the improvement of their technical and economic characteristics. Scientific novelty: for the first time design models of steady state indications of electromagnetic systems of induction motor with an external rotor and axial induction motor, taking into account the unevenness radial distribution of magnetic induction in the elements of magnetic circuit, have been developed and their optimal geometric relationships have been determined. The design models of steady-state indications of variants of bipolar transformers with a rotating magnetic field for a converting of number of phases and voltage with radial and axial electromagnetic systems have been improved. Degree of implementation: results of the research were used by UkrNIIVE (Nova Kajovka). Design models of indications of induction motors and transformers with a rotating magnetic field are introduced into the educational process of training specialists and masters in electromechanics of NUS named after Admiral Makarov. Application area: results of thesis can be used in the design of special induction motors and transformer converters of number of phases and voltage level.