scholarly journals Influence of limiting the duration of the armature winding current on the operating indicators of a linear pulse electromechanical induction type converter

2021 ◽  
pp. 3-10
Author(s):  
V.F. Bolyukh ◽  
I.S. Shchukin
Keyword(s):  
Heating Temperature ◽  
Power Device ◽  
Maximum Efficiency ◽  
Induced Current ◽  
Efficiency Criterion ◽  
Operating Cycle ◽  
Capacitive Energy Storage ◽  
Induction Type ◽  
Linear Pulse ◽  
Solutions Of Equations

Introduction. Linear pulse electromechanical converters of induction type (LPECIT) are used in many branches of science and technology as shock-power devices and electromechanical accelerators. In them, due to the phase shift between the excitation current in the inductor winding and the induced current in the armature winding, in addition to the initial electrodynamic forces (EDF) of repulsion, subsequent EDF of attraction also arise. As a result, the operating indicators of LPECIT are reduced. The purpose of the article is to increase the performance of linear pulse electromechanical induction-type converters when operating as a shock-power device and an electromechanical accelerator by limiting the duration of the induced current in the armature winding until its polarity changes. Methodology. To analyze the electromechanical characteristics and indicators of LPECIT, a mathematical model was used, in which the solutions of equations describing interrelated electrical, magnetic, mechanical and thermal processes are presented in a recurrent form. Results. To eliminate the EDF of attraction between the LPIECIT windings, it is proposed to limit the duration of the induced current in the armature winding before changing its polarity by connecting a rectifier diode to it. It was found that when the converter operates as a shock-power device without limiting the armature winding current, the value of the EDF pulse after reaching the maximum value decreases by the end of the operating cycle. In the presence of a diode in the armature winding, the efficiency criterion, taking into account the EDF pulse, recoil force, current and heating temperature of the inductor winding, increases. When the converter operates as an electromechanical accelerator without limiting the armature winding current, the speed and efficiency decrease, taking into account the kinetic energy and voltage of the capacitive energy storage at the end of the operating cycle. In the presence of a diode in the armature winding, the efficiency criterion increases, the temperature rise of the armature winding decreases, the value of the maximum efficiency increases, reaching 16.16 %. Originality. It has been established that due to the limitation of the duration of the armature winding current, the power indicators of the LPECIT increase when operating as a shock-power device and the speed indicators when the LPECIT operates as an electromechanical accelerator. Practical value. It was found that with the help of a rectifier diode connected to the multi-turn winding of the armature, unipolarity of the current is ensured, which leads to the elimination of the EDF of attraction and an increase in the performance of the LPECIT.

Influence of the Form of Pulse of Excitation on the Speed and Power Parameters of the Linear Pulse Electromechanical Converter of the Induction Type

2019 ◽  
Author(s):  
Vladimir F. Bolyukh ◽  
Igor I. Katkov
Keyword(s):  
Experimental Studies ◽  
Excitation Pulse ◽  
Displacement Sensor ◽  
Power Device ◽  
Storage Device ◽  
Capacitive Energy Storage ◽  
Recurrent Relations ◽  
Induction Type ◽  
Linear Pulse ◽  
The Impact

Abstract Linear pulse electromechanical converters (LPEC) of induction type allow providing a high speed of the actuating element in the short active section and creating powerful power impulses with its insignificant movement. One of the ways to improve the electromechanical indicators of LPEC is the formation of current excitation pulses in the inductor using electronic power supply circuits containing a capacitive energy storage device. This publication is a continuation of our previous work on the influence of different parameters and conditions on the performance of LPEC. Using the developed chain mathematical model, recurrent relations are obtained for calculating the interconnected electromagnetic, mechanical and thermal parameters of LPEC. It has been established that the speed and power electromechanical indicators of LPEC with aperiodic excitation pulse are better than those of LPEC with unipolar excitation, but worse than those of LPEC with oscillating-damped excitation pulse. LPEC with a unipolar excitation pulse, by the end of the working cycle, the smallest temperatures of the inductor and the armature are observed, while for LPEC with a oscillating-damped excitation pulse, the greatest efficiency is ensured, being 24.88%. The highest speed and power electromechanical indicators are provided at LPEC with a step-aperiodic excitation pulse. Experimental studies of LPEC were conducted when operating as an electromechanical accelerator and a shock-power device. In studies of LPEC, a piezoelectric transducer was used as a shock-power device, which converted mechanical vibrations arising from the impact of the striker on the impact plate into electrical signals. In studies of LPEC, a displacement sensor was used as an electromechanical accelerator. It was established experimentally that the movement of the armature begins with a delay relative to the moment of occurrence of the current pulse and is almost linear in the initial part of the acceleration.

scholarly journals INFLUENCE OF AN EXCITATION SOURCE ON THE POWER INDICATORS OF A LINEAR PULSE ELECTROMECHANICAL CONVERTER OF INDUCTION TYPE

2021 ◽  
Vol 2021 (3) ◽  
pp. 28-36
Author(s):  
V.F. Bolyukh ◽  
◽  
I.S. Shchukin ◽  
◽  
◽  
...  
Keyword(s):  
Voltage Source ◽  
Capacitive Energy Storage ◽  
Maximum Value ◽  
Unipolar Pulse ◽  
Induction Type ◽  
Linear Pulse ◽  
Voltage Frequency ◽  
Power Mode ◽  
Electromechanical Converter ◽  
Alternating Voltage

The purpose of the article is to evaluate the efficiency of an induction-type linear pulse electromechanical converter (LPEC) when operating in shock-power mode and excitation from an alternating voltage source (AVS) in comparison with excitation from a capacitive energy storage (CES). A mathematical model of an induction-type LPEC has been developed both when excited by a unipolar pulse from a CES and from an AVS using lumped parameters of the windings, which takes into account the interrelated electromagnetic, mechanical and thermal processes. It has been found that when the LPEC is excited from the AVS with a voltage frequency of 50 Hz, the electrodynamic force takes on a periodic decaying character with a significant prevalence of positive components of forces over negative ones. The maximum value of the force is much less, and the value of its impulse is much greater than in the LPEC, excited from the CES. With an increase in the frequency of the AVS voltage from 50 to 150 Hz, the highest value of the current density of the inductor winding decreases, and in the armature winding it increases. The greatest values of force and impulse of force are realized at a voltage frequency of 150 Hz. With an increase in the AVS frequency, the relative indicator of the efficiency of the LPEC increases. References 15, figures 4.

scholarly journals Improvement Process Drying Product

2019 ◽  
Vol 9 (2) ◽  
pp. 656-659
Keyword(s):  
Fruits And Vegetables ◽  
Agricultural Sector ◽  
Heating Temperature ◽  
Global Scale ◽  
Fruit Production ◽  
Maximum Efficiency ◽  
Treatment Processes ◽  
High Effect ◽  
Dried Fruit ◽  
The Cost

Currently, agriculture, food production and ensuring its safety are more relevant than ever on a global scale. At the same time, the processing of agricultural products has been and remains a decisive factor affecting the efficiency of agricultural production. Being one of the most important sectors of the agricultural sector of Uzbekistan, the production of dried fruits and vegetables, the level of development of which largely determines the solution to the country's food problem, should be based on the desire to reduce the cost of dried fruit production. By analyzing the achievement of a high effect of the use of infrared radiation, the study of the heating temperature of the emitter is substantiated. The mechanism of the emitted energy of the IR spectrum, the magnitude of its duration and density are described. The cyclical nature of energy transformations, ensuring the maximum efficiency of the process, the effect, including sterilizing when drying fruits (figs and apples), is revealed. The experimentally obtained parameters of the heat treatment processes of figs and apples are presented.

scholarly journals OPTIMIZATION TECHNIQUE OF DRIVING DISC PARAMETERS

2021 ◽  
pp. 317-325
Author(s):  
Yu.V. Konstantinov ◽  
A.P. Akimov ◽  
V.I. Medvedev ◽  
A.G. Terentyev
Keyword(s):  
High Efficiency ◽  
Driving Forces ◽  
Operation Mode ◽  
Optimization Technique ◽  
Specific Energy Consumption ◽  
Kinematic Parameter ◽  
Maximum Efficiency ◽  
Relative Depth ◽  
Efficiency Criterion ◽  
Experimental Values

Flat circular discs in powered operation mode create driving forces. These forces enable to decrease the wheel slippage of the energy saturated tractor of tillage unit and to reduce the specific energy consumption. The objective of this study was to develop a technique that enables to determine the driving disc optimal parameters for maximum efficiency criterion. The earlier developed mathematical model of soil-disc interaction was used for this purpose. Soil properties in the model are characterized by means of two empirical constants. The relative depth and the kinematic parameter determine the disc operation mode. It was shown that the driving disc can operate with high efficiency, if the disc operates at the optimal values of the parameters. The driving disc efficiency can achieve the value about fifty percent. The experimental results confirmed the adequacy of the technique. The discrepancy between the predicted and field experimental values of driving forces and applied moments was about 25%. The proposed technique can be modified to optimize the parameters of other powered rotary tools of tillage machines and units.

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