Design and Analysis of a Novel Three-Coil Reconnection Electromagnetic Launcher

Fan, G. J.; Wang, Yu; Xu, Qian; Nie, Xinyi; Yan, Zhongming

doi:10.1109/tps.2018.2874287

Cited by 15 publications

(5 citation statements)

References 14 publications

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“…Electromechanical induction accelerators (EIAs) provide acceleration of the actuator to a high speed in a short active section [1][2][3][4][5]. In these coaxial accelerators, the stationary inductor winding, excited either from a capacitive energy storage (CES) or from an alternating voltage source (AVS), induces a current in the armature winding.…”

Section: Introductionmentioning

confidence: 99%

Influence of the initial winding displacement on the indicators of the electromechanical induction accelerator of cylindrical configuration

Bolyukh¹,

Schukin²,

Lasocki

2021

Electrical Engineering & Electromechanics

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Purpose. The purpose of the article is to determine the influence of the initial displacement of the windings on the indicators of an electromechanical induction accelerator of a cylindrical configuration with pulsed excitation from a capacitive energy storage and with short-term excitation from an alternating voltage source. Methodology. To take into account the interrelated electrical, magnetic, mechanical and thermal processes, as well as a number of nonlinear dependencies, we use the lumped parameters of the windings, and the solutions of the equations describing these processes are presented in a recurrent form. The mathematical model of the accelerator takes into account the variable magnetic coupling between the windings during the excitation of the inductor winding. When calculating the parameters and characteristics of the accelerator, a cyclic algorithm is used. Results. At a frequency of an alternating voltage source of 50 Hz, the current amplitude in the armature winding is less than in the inductor winding. With an increase in the source frequency to 250 Hz, the phase shift between the winding currents decreases. The current in the inductor winding decreases, and in the armature winding it increases. The accelerating components of the force increase, and the braking ones decrease. With an increase in the source frequency to 500 Hz, the current density in the armature winding exceeds that in the inductor winding. In this case, the phase shift between the windings is further reduced. Originality. When a cylindrical accelerator is excited, the largest amplitude of the current density in the inductor winding occurs at the maximum initial displacement of the windings, but the amplitude of the current density in the armature winding is the smallest. The largest value of the current density in the armature winding occurs in the absence of an initial displacement. When excited from a capacitive energy storage, the electrodynamic force between the windings has an initial accelerating and subsequent braking components. As a result, the speed of the armature initially increases to a maximum value, but decreases towards the end of the electromagnetic process. When a cylindrical accelerator is excited from an alternating voltage source, a phase shift occurs between the currents in the windings, which leads to the appearance of alternating accelerating and decelerating components of electrodynamic forces. The accelerating components of the force prevail over the braking components, which ensures the movement of the armature. Practical value. At a frequency of an alternating voltage source of 50 Hz, the highest speed at the output of the accelerator vzf=0.5 m/s is realized at an initial displacement of the windings z0=6.2 mm, at a frequency of 250 Hz, the highest speed vzf=2.4 m/s is realized at z0=3.1 mm, and at a frequency of 500 Hz the highest speed vzf=2.29 m/s is realized at z0=2.3 mm.

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Section: Introductionmentioning

confidence: 99%

Influence of the initial winding displacement on the indicators of the electromechanical induction accelerator of cylindrical configuration

Bolyukh¹,

Schukin²,

Lasocki

2021

Electrical Engineering & Electromechanics

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“…Of particular interest is a circuit with sequential excitation of the PEC from two sections of the CES, in which the additional section is charged at a reduced voltage in relation to the main section [13]. Note that if the inductor in a PEC of induction type is made in the form of axially located sections of a solenoidal configuration, inside which an armature of a similar configuration moves, then with sequential excitation from a multisection CES the efficiency of the electromechanical accelerator increases [14]. However, if in such a converter the inductor and the armature have a disk configuration, then such excitation is not possible.…”

mentioning

confidence: 99%

Excitation of a Pulse Electromechanical Converter of Electrodynamic Type From a Two-Section Capacitor Energy Storage

Bolyukh

2021

Teh. elektrodin.

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A mathematical model of a pulsed electromechanical converter (PEC) of electrodynamic type has been developed, in which the solutions of the equations are presented in a recurrent form, which, when numerically implemented, allows taking into account the interrelated electrical, magnetic, mechanical and thermal processes and their nonlinear parameters. While maintaining the total energy of the pulsed source, the influence of the distribution of energy between the two sections of the capacitive energy storage (CES) and the voltage at which the additional section of the CES is connected was established. When operating in an accelerating mode, the largest amplitude of electrodynamic forces (EDF) and maximum speed occur in the basic version of the PEC, which is excited only from the main section of the CES, and the most effective is the PEC with the smallest capacity of the main section of the CES, and its maximum value is 2.61 higher than for the basic version of the PEC. When operating in the shock-power mode, compared with the basic version of the PEC, the amplitude of the EDF decreases. The most effective is the PEC with the smallest capacity of the main section of the CES, and its maximum value is 5.17 higher than that of the basic version of the PEC. Experimental studies of the PEC in the shock-power mode established that the oscillograms of the voltage of the CES and the current of the PEC correspond to the calculated characteristics, and their main indicators are consistent with each other with an accuracy of 5-7%. References 16, figures 6.

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“…Introduction. Linear electromechanical converters (LEMCs) of induction type are used to accelerate the actuation element to high speed in a short active section and to create powerful force pulses on the object of influence with a slight movement of the specified element [1][2][3][4]. Such converters operate in high-speed (accelerating) and shock-power modes.…”

mentioning

confidence: 99%

Features of excitation of a linear electromechanical converter of induction type from an AC source

Bolyukh¹,

Kashansky²,

Schukin³

2021

Electrical Engineering & Electromechanics

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Purpose. The purpose of the article is to establish the basic laws of operation of induction-type linear electromechanical converter (LEMС) during operation in high-speed and shock-power modes and excitation from an AC source of increased frequency. Methodology. With the help of a mathematical model, the regularities of the course of processes in a LEMС, excited from an AC source, were established when working with shock-power and high-speed modes. The solutions of the equations of the mathematical model, which describe interrelated electrical, magnetic, mechanical and thermal processes, are presented in a recurrent form. Results. It was found that when the LEMC operates in the shock-power mode, the maximum value of the current in the inductor winding occurs in the first half-period, and in the inhibited armature winding in the second half-period. The electrodynamic force changes at twice the frequency, taking on both positive and negative values. Since the positive values exceed the negative ones, the magnitude of the impulse of the electrodynamic force increases with each period of the force. Depending on the initial voltage phase, the relative change in the magnitude of the force impulse is 1.5 %. It was found that when the LEMC operates in high-speed mode, the current in the inductor winding in the first half-period has the greatest value, but after several periods it takes on a steady state. The temperature rise of the inductor winding increases with the time of connection to the AC source, and the temperature rise of the armature winding has the nature of saturation. The electrodynamic force has an oscillatory character with strong damping and a significant predominance of the positive component. Depending on the initial phase of the voltage, the relative change in the maximum speed of the armature winding is 2.5 %. Originality. For the first time, a mathematical model of the LEMC, excited from an AC source, was developed, the solutions of the equations of which describe the interrelated electrical, magnetic, mechanical and thermal processes. For the first time, the regularities of the course of processes in LEMC were established when working with shock-power and high-speed modes. Practical value. The characteristics of LEMC are obtained, which determine the efficiency of work in shock-power and high-speed modes. It is shown that the initial voltage phase has no significant effect on the power, high-speed thermal performance of the converter excited from an alternating current source.

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Design and Analysis of a Novel Three-Coil Reconnection Electromagnetic Launcher

Cited by 15 publications

References 14 publications

Influence of the initial winding displacement on the indicators of the electromechanical induction accelerator of cylindrical configuration

Influence of the initial winding displacement on the indicators of the electromechanical induction accelerator of cylindrical configuration

Excitation of a Pulse Electromechanical Converter of Electrodynamic Type From a Two-Section Capacitor Energy Storage

Features of excitation of a linear electromechanical converter of induction type from an AC source

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