Investigation of Thermal Processes in a Linear Pulse-Induction Electromechanical Converter of Cyclic Action

Introduction. Recently, in the literature, inductive-dynamic mechanisms (IDMs), known in foreign literature as a Thomson-drive, as a drive for various electrical devices are often researched and developed. The simplicity and reliability of the design, high speed make such devices indispensable in high-speed electrical devices standing in DC networks, in which emergency overcorrects are not limited by the reactance and can reach significant values. The novelty of the proposed work consists in the development of a mathematical model and the study of the Thompson drive, in which a bistable two-position mechanism consisting of a magnetic system with permanent magnets, is used as the final position latches. The movement of objects is carried out by deforming the computational mesh. The problem is a multiphysical one, in which a parallel solution of several tasks of different nature is considered. Purpose. Analysis of the fundamental possibility of creating a switching device with an induction-dynamic drive on the basis of a mathematical model which allows to increase the reliability of the entire mechanism operation and significantly simplify the design. Methods. The solution of the problem was carried out by the Finite Element Method in the COMSOL package in a cylindrical coordinate system. Results. A mathematical model of a new fast-driven induction-dynamic drive with a bistable mechanism, based on the equations of the electromagnetic field, electric circuit, equations of motion, was developed and partially studied. The model allows to calculate the dynamic parameters of the drive based on the initial data. Conclusions. The principal possibility of creating a high-speed actuator of switching devices based on an induction-dynamic mechanism and a polarized bistable mechanism based on permanent magnets is demonstrated. The research directions of the model were determined for the subsequent implementation of the results in experimental samples. References 11, table 1, figures 13.

Section: в статье исследована оригинальная математическая модель быстmentioning

confidence: 99%

Peculiarities of Dynamics of a Fast-Driven Induction-Dynamic Drive With a Bistable Latch of Contacts Position of a Circuit Breaker Based on Permanent Magnets

Baida¹,

Lytvynenko²,

Чепелюк³

2020

“…In the absence of displacement of the armature, which occurs either before the start of the forward stroke, or after the return stroke, there is a thermal contact between the inductor and armature coils through the insulation gasket. The temperatures of the n-th active elements of the LPEC of electrodynamic type can be described by the recurrent relation [12]:…”

Section: разработана цепная математическая модель линейного импульсноmentioning

confidence: 99%

Influence of Geometrical Parameters of the Inductor and Armature on the Indicators of a Linear Pulse Electromechanical Converter of an Electrodynamic Type

Bolyukh¹,

Kashanskij²,

Schukin³

2019

Self Cite

The aim of the paper is to study the influence of geometrical parameters, namely, the number of layers and the cross section of the copper tire of the inductor and the armature coils on the power and speed indicators of a linear pulse electromechanical converter (LPEC) of an electrodynamic type. Methodology. On the basis of the developed chain mathematical model, recurrent relations are obtained for the calculation of interconnected electromagnetic, mechanical and thermal processes of LPEC of an electrodynamic type. The effect of the thickness of a square copper tire and the number of its layers in the inductor and armature coils on the characteristics and characteristics of electrodynamic LPEC is investigated. It is these parameters that determine the number of turns and the axial height of the coils with limited radial dimensions. Results. The influence of the geometrical parameters of the inductor and the armature coils with limited radial dimensions on the electrical and mechanical characteristics of LPEC of an electrodynamic type is established. It has been established that with an increase in the thickness of a rectangular cross-section of copper tire from 1 to 2.5 mm, an increase in the amplitude and pulse of electrodynamic forces (EF) occurs. However, the maximum speed of the armature is the highest at LPEC wound with a 1.5 mm thick tire. The highest efficiency value is demonstrated by LPEC, in which the inductor and armature coils are wound with a 2 mm thick tire. With an increase in the number of layers of the inductor coil tire, the amplitude of the EF decreases significantly, and the magnitude of the EF pulse decreases slightly. As a result, the maximum armature speed, efficiency and temperature rise of the coils are reduced. Originality. It is established that the largest amplitude of the EF is realized in LPEC with the minimum number of layers of tires of the inductor and armature coils. The largest value of the pulse EF occurs when the maximum number of layers of the inductor and the armature. In this case, the largest values of the amplitude and pulse of the EF occur under the condition that the number of tire layers of the inductor and the armature coils are the same. Practical value. It has been established that the greatest efficiency 21.82 % is realized in LPEC, in which the number of tire layers is 2 mm thick with inductor and armature coils are 4. A catapult model for launching an unmanned aerial vehicle was made and tested on the basis of LPEC of an electrodynamic type. References 12, figures 6. Key words: linear pulse electromechanical converter of electrodynamic type, chain mathematical model, recurrent relations, geometrical parameters of inductor and armature coils, electrodynamic forces, efficiency.

An Optimization Approach to the Choice of Parameters of Linear Pulse Induction Electromechanical Converter

Bolyukh¹,

Schukin²

2018

The purpose of the paper is to select the main parameters of the linear pulse induction electromechanical converters (LPIEC) for high-speed and power use with the use of the optimization approach, which provides an increase in speed and power indicators with limited electric, thermal and mass-dimensions. Methodology. A technique for finding the maximum of the integral efficiency criterion of LPIEC in the search space using a global optimization method that randomly searches for parameters, preventing entry into a local maximum, and a local method ensuring the contraction of the range of parameters with a global maximum to minimum dimensions is developed. As a global optimization method, genetic algorithms are used, and the Nelder-Mead method is used as the local method. Results. The LPIEC inductor should have a maximum external and minimum internal diameter, and its height should be less than that of the LPIEC of the basic design. The armature should have a maximum outer diameter, and the thickness of its wire should be minimal. The armature should be made with a significantly higher height, a greater number of turns and a wider wire. The height of the LPIEC inductor for power purposes should be almost the same as that of the LPIEC of the basic design. In this case, the number of turns of the inductor and the cross section of its wire should be approximately the same. The armature should be made with a slightly larger inner diameter and a significantly higher height. This armature should have a larger number of turns of wire, which must be stacked in 4 layers, and a large width of the wire. The average energy value and voltage of the capacitive energy storage for the LPIEC for high-speed and power applications should be higher than for the LPIEC of the basic design. Originality. An optimization approach to the choice of LPIEC parameters with a multi-turn squirrel arm is developed, which consists in finding the maximum of an integral efficiency criterion that takes into account the maximum speed and efficiency in a high-speed converter, the amplitude and magnitude of the electrodynamic force pulse in a power converter, with minimum temperature excesses, the mass of active elements and current of the inductor. The optimization uses a chain mathematical model that takes into account the interconnected electrical, magnetic, thermal and mechanical processes of the LPIEC. Practical value. The electric parameters of the capacitive energy storage device and the geometric parameters of the LPIEC are determined, which ensure the largest values of the integral efficiency criterion depending on the adopted version of the efficiency evaluation strategy. In optimized speed and power transfer converters, the integral efficiency criteria are 2.2 times higher on average than in the basic performance of the LPIEC. References 14, tables 6, figures 2.