An Unsymmetrical Two-Phase Induction Motor Drive With Slip-Frequency Control

Abdel-Rahim, Naser; Shaltout, A.

doi:10.1109/tec.2009.2026599

Cited by 30 publications

(10 citation statements)

References 9 publications

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“…As a result, the arbitrary output space vector is rotated with an ellipse trajectory. Therefore, the unbalanced voltage factor |A| can be dealt within the unbalanced output voltage as follows, V ab = |A| 2V dc (7) when 0 < |A| < 1.…”

Section: Angularmentioning

confidence: 99%

Comparative analysis of switching losses and current ripple of continuous and discontinuous SVPWM strategies for unbalanced two‐phase four‐leg VSI Fed unsymmetrical two‐phase induction motor

Muangthong¹,

Charumit²

2021

IET Power Electronics

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This paper presents a comparative analysis of the continuous space vector pulse width modulation and the discontinuous space vector pulse width modulation in terms of the switching losses and current ripple reduction for the unbalanced two‐phase four‐leg voltage source inverter fed unsymmetrical two‐phase induction motor. The main function of both space vector pulse width modulation strategies is to produce unbalanced two‐output voltages with constant phase shift of 90° for main and auxiliary windings. The discontinuous space vector pulse width modulation principle is modified from a traditional two‐phase four‐leg voltage source inverter by placement of the space vectors to alternatively eliminate zero space vector in each switching sequence. As a consequence, the proposed unmodulation region or clamping zone of the discontinuous modulation strategy has 180° all the time. The experimental results illustrate the modulation waveforms of both methods, output voltage spectrum, normalized switching losses, output current ripple and inverter efficiency at high modulation index. The evaluation of the normalized average switching losses and the current ripple of the discontinuous space vector pulse width modulation method can be reduced more than that of the continuous space vector pulse width modulation method.

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Section: Angularmentioning

confidence: 99%

Comparative analysis of switching losses and current ripple of continuous and discontinuous SVPWM strategies for unbalanced two‐phase four‐leg VSI Fed unsymmetrical two‐phase induction motor

Muangthong¹,

Charumit²

2021

IET Power Electronics

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“…Данную систему управления можно назвать системой с релейными регуляторами тока. Для двухфазного инвертора такая система рассматривалась в [11]. Во внешнем контуре скорости формируется задание на амплитуду тока одной фазы, пропорциональную амплитуде тока другой фазы, и задание на частоту синусоид токов.…”

Section: рис 1 структура двухступенчатой системы двухфазного электрunclassified

Development of a control algorithm for the three-phase inverter of the two-phase electric drive for reducing the number of switching elements

Meshcheryakov

Belousov

2019

Vestnik IGEU

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High overload capacity and ability to control speed in a wide range are important requirements for modern electric drives. Introduction of a low-power adjustable two-phase electric drive with these properties into me-chanical devices is limited by the frequency converter function to convert a three-phase network into a two-phase one when the unit power of such mechanisms increases. Previous studies have shown that it is possible to use a standard frequency converter with a three-phase bridge voltage inverter applying a new control algorithm based on space-vector PWM. When PWM is used, the switching frequency of the key inverter elements remains quite high, strictly specified, non-amenable to reduction without degrading the harmonic composition. The goal of this work is to develop an algorithm for two-phase electric drive control that would reduce the number of switching operations of the switch elements of a three-phase inverter with-out increasing the deviations of the instantaneous values of the phase currents from the reference sine curve. The study employed provisions of the theory of automatic control, the theory of electric drive and methods of mathematical modeling. The simulation object was the control system of a two-phase motor; the elements of the Matlab Simulink software package were used. An algorithm has been proposed for operating a three-phase inverter of a two-phase electric drive system. The difference of the algorithm from the well-known control system of a standard bridge inverter with space vector PWM consists in using phase current control relays and dividing the period of sinusoidal phase currents into four sections ensuring a decrease in the number of switching operations of the inverter switch elements when the maximum instantaneous deviations of current values from a sinusoidal reference are equal, the starting torque of the motor is stabilized and the speed control is smooth. The results show that with an equal maximum deviation of the instantaneous current values from a given sinusoidal value, the number of switching operations of the inverter switch elements in the proposed system is smaller than in the known analogues. The electric drive system ensures the start of a two-phase motor with stabilization of the starting torque under increased load. The considered system of variable frequency control with current control relays can be used for two-phase electric drives of mechanical devices and household electric appliances and is promising as a substitute for less cost-effective single-phase and capacitor motors.

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“…With Eq. (1) observed throughout all operating conditions, an equivalent circuit of the one-phase IM when operated as symmetrical two-phase IM was derived in [13] and is shown in Figure 1, where Two-phase Induction Motor Drive r 1 and r 2 are the resistances of the main and auxiliary windings, respectively; X 1 and X 2 are the leakage reactances of the main and auxiliary windings, respectively; r r is the rotor resistance (referred to the main winding); X r is the rotor leakage reactance (referred to the main winding); X m is the magnetizing reactance; I m1 and I m2 are the magnetizing currents of the main and auxiliary windings, respectively; and s is the rotor slip.…”

Section: Operation Of One-phase Im As Symmetrical Two-phase Immentioning

confidence: 99%

Adjustable-speed Unsymmetrical Two-phase Induction Motor Drive for Photovoltaic Powered Air Conditioners

Abdel-Rahim

2010

Electric Power Components and Systems

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This article proposes a novel application of adjustable-speed one-phase induction motors in air conditioners powered by photovoltaic arrays. Employing the slip-frequency control scheme, an off-the-shelf one-phase induction motor is operated as an unsymmetrical two-phase induction motor. Maintaining certain control conditions, the unsymmetrical two-phase induction motor is made to behave like a symmetrical two-phase induction motor. This has the advantage of increasing the motor efficiency and reducing the torque pulsations inherent to unsymmetrical twophase induction motors. The proposed control scheme reduces both initial and running costs of the proposed photovoltaic system. Initial cost is cut down by reducing the required size of the photovoltaic array through (i) limiting the motor current during both transient and dynamic phases of operation, (ii) extracting maximum power from the photovoltaic array under various climate conditions by operating the photovoltaic array on the maximum power line, and (iii) dispensing with the need for specially designed two-phase induction motors. Reduction in the running cost of the photovoltaic system is achieved by enhancing the motor efficiency through eliminating the backward component of the air gap flux. The article outlines a procedure for sizing the photovoltaic arrays. Simulation results of the system behavior during transient and dynamic phases confirm the capability of the proposed scheme.

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An Unsymmetrical Two-Phase Induction Motor Drive With Slip-Frequency Control

Cited by 30 publications

References 9 publications

Comparative analysis of switching losses and current ripple of continuous and discontinuous SVPWM strategies for unbalanced two‐phase four‐leg VSI Fed unsymmetrical two‐phase induction motor

Comparative analysis of switching losses and current ripple of continuous and discontinuous SVPWM strategies for unbalanced two‐phase four‐leg VSI Fed unsymmetrical two‐phase induction motor

Development of a control algorithm for the three-phase inverter of the two-phase electric drive for reducing the number of switching elements

Adjustable-speed Unsymmetrical Two-phase Induction Motor Drive for Photovoltaic Powered Air Conditioners

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