Calculation of capacitors for starting up a three-phase asynchronous motor fed by single-phase power supply

Malyar, V. S.; Hamola, Orest; Maday, V. S.

doi:10.1109/cpee.2016.7738735

Cited by 7 publications

(2 citation statements)

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“…In practice, the use of induction motors with a three-phase stator winding is observed under conditions of single-phase power supply [4,5]. For the possibility of their operation when powered from a single-phase network, starting and working capacitors are used [6,7]. The use of voltage-regulated electric drives based on three-phase induction motors makes it possible to meet the technological and energysaving requirements of many consumers [8,9], to facilitate start-up conditions [10], and to increase the energy efficiency of technological units by taking into account the nature of load changes in the algorithm for regulating closed-loop electric drive systems [11].…”

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confidence: 99%

Method of calculation of electromagnetic torque and energy losses of three-phase induction motors when powered by a regulated single-phase voltage

Shurub¹,

Vasylenkov²,

Tsitsyurskiy³

2022

Electrical Engineering & Electromechanics

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Introduction. Single-phase power supply of induction motors is used in public utilities, in microclimate control systems for remote agricultural consumers, in water supply and pipeline transport systems, etc. In practice, there is the use of induction motors with three-phase stator winding in the conditions of single-phase power supply. Starting and operating capacitors are used to enable their operation when powered by a single-phase network. Problem. There are many fairly accurate methods for calculating the characteristics of an induction motor in asymmetric, including single-phase, modes of operation, but they are based on differential equations, which does not allow to obtain analytical expressions for preliminary analysis and synthesis of such systems. Goal. The purpose of this article is to develop the analytical method of definition of electromagnetic torque and energy losses of voltage-regulated three-phase induction motors working according to the scheme of single-phase inclusion with the phase-shifting capacitor. Methodology. The method is based on the theory of symmetric components and analysis of replacement schemes of induction machine in motor and generator modes. Results. The analysis of the obtained data shows that at a constant value of the phase-shifting capacitor capacity induction motor working according to the scheme of single-phase inclusion has a minimum of losses at one value of slip at different values of supply voltage. Therefore, if you keep this slip constant when the load changes, you can achieve a mode of minimizing losses at a constant value of the capacity, optimal for this slip. This shows that the thyristor voltage regulator can be used as an energy-saving element under variable load, while the capacitance of the phase-shifting capacitor can remain constant when changing the load in a wide range provided that this slip is stabilized. Originality. The developed method allows to obtain analytical expressions for comparative analysis of electromagnetic torque and energy losses of three-phase induction motors powered by a single-phase network at different values of the capacity of the phase-shifting capacitor, supply voltage for different variants of schemes for including three-phase induction motors in a single-phase network. Practical value. Based on the developed analytical method, the optimal parameters of phase-shifting capacitors and rational schemes for including three-phase induction motors in a single-phase network can be determined.

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confidence: 99%

Method of calculation of electromagnetic torque and energy losses of three-phase induction motors when powered by a regulated single-phase voltage

Shurub¹,

Vasylenkov²,

Tsitsyurskiy³

2022

Electrical Engineering & Electromechanics

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“…Circuits of single-phase switching of three-phase induction motors (IMs) with phase-shifting capacitor and permanent structure of the power section are widely used in unregulated electric drives due to the simplicity of design and sufficiently high energy characteristics [1][2][3]. In the case of a controlled electric drive (ED), the use of circuits with the connection of a phase-shifting capacitor with constant capacity can significantly impair the operational and energy characteristics of the electric drive in start-up and variable speed operation [2,3]. The use of a capacitor with an adjustable capacity increases the overall dimensions of the ED.…”

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Harmonic Analysis of the Combined Circuit of Single-Phase Switching of Induction Electric Drive With Thyristor Control

Shurub¹,

Tsitsyurskiy²

2020

Elektroteh. elektromeh.

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Purpose. The purpose of this article is to provide a comparative analysis of influence of the phase controlled single-phase induction electric drive coordinates harmonic components on the operational characteristics of the electric drive under different variants of the power part. Methodology. A mathematical model of the combined circuit of a single-phase induction motor with a variable structure of the power part and a constant capacitance of the phase-shifting capacitor is generalized for various variants of connection of the power part of the electric drive with thyristor control. The comparative harmonic analysis of currents and torques of the motor is carried out and the factors influencing the energy efficiency of the electric drive at different circuit of connection of the power part are determined. Results. The analysis of the obtained data shows that the series-parallel circuit has the best harmonic composition of the consumed current in practically the whole range of changes of load torque and speed. The main effect on the loss increase is due to the asymmetry of the currents in the series-parallel circuit and the higher harmonics in the Steinmetz circuit. Originality. For the analysis of the processes in these circuits, a generalized thyristor control single-phase electric drive mathematical model, in which the structure of differential equations remains unchanged regardless of the circuit of connections of the power part, is developed. Practical value. Using of the combined circuit of single-phase switching on of a three-phase induction motor allows to use a constant capacity in the range of slips from nominal to critical without exceeding the nominal losses. References 4, tables 1, figures 5.

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Elimination of self-oscillation mode in a thyristor-controlled induction electric drive

Shurub

Vasilenkov

2021

2021 IEEE 2nd KhPI Week on Advanced Technology (KhPIWeek)

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Calculation of capacitors for starting up a three-phase asynchronous motor fed by single-phase power supply

Cited by 7 publications

References 0 publications

Method of calculation of electromagnetic torque and energy losses of three-phase induction motors when powered by a regulated single-phase voltage

Method of calculation of electromagnetic torque and energy losses of three-phase induction motors when powered by a regulated single-phase voltage

Harmonic Analysis of the Combined Circuit of Single-Phase Switching of Induction Electric Drive With Thyristor Control

Elimination of self-oscillation mode in a thyristor-controlled induction electric drive

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