Topic
Three-phase
About: Three-phase is a research topic. Over the lifetime, 16801 publications have been published within this topic receiving 159477 citations.
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TL;DR: In this article, the problem of solving the general three-phase induction motor performance equations is discussed and methods of digital solution for both the threephase motor and the two-axis model are described.
Abstract: The problem of solving the general three-phase induction motor performance equations is discussed and methods of digital solution for both the three-phase motor and the two-axis model are described.
69 citations
18 Jun 1984
TL;DR: In this article, a step-up converter circuit for the sinusoidal line current rectification at a unity power factor is described, where a Bipolar-Static-Induction-Transitor (SIT) with extremely fast switching times is utilized.
Abstract: A step-up converter circuit for the sinusoidal line current rectification at a unity power factor is described. A Bipolar-Static-Induction-Transitor (B-SIT) with extremely fast switching times is utilized. The gate drive and the snubber circuits are presented. A new way to achieve current hysteresis control without noise problems for switching frequencies up to 100 kHz is developed. Measured overall efficiency and the transistor losses are presented. At 1 kw dc output, the total transistor switching and conduction losses are 9 watts at about 100 kHz switching frequency. The overall rectification efficiency is in a 97–98.5% range. Justification for the use of step-up converters is given. Component selection and the stability in the feedback loop is analyzed. The converter is especially advantageous for single phase in — three phase out, variable frequency ac motor drives in lower horsepower applications.
69 citations
Patent•
29 Sep 1997
TL;DR: In this paper, a three-phase matrix converter for converting AC voltages of predetermined amplitude and frequency into AC voltage and frequency was proposed, which includes four-segment switches as main switches which are combined into three switch groups.
Abstract: A three-phase matrix converter for converting AC voltages of predetermined amplitude and frequency into AC voltages of any amplitude and frequency and a method for operating the same, include four-segment switches as main switches which are combined into three switch groups. A resonance capacitance is connected in parallel with each main switch, or an output capacitance of power semiconductors of the main switches acts as a resonance capacitance. An auxiliary commutation device which is provided between three-phase output connections of each switch group has an auxiliary switch constructed as a four-segment switch and a resonance inductance connected in series therewith.
69 citations
TL;DR: Experimental results show that the proposed waveform correction scheme recovers the α-β current waveforms and, as a result, prevent the increase in the sixth harmonic ripple in the d-q currents, which is inherent to the PWM inverter-controlled drives.
Abstract: This paper aims to reveal an offset jitter-like waveform error, which is usually present in all three-phase current signals reconstructed from dc-link current samples. This paper also presents a method for the cancellation of that error, which could be useful in low-cost shaft-sensorless drives. A combination of two samples' time displacement and the line current pulse-width modulation (PWM) ripple produces a distinctive shape of the reconstructed current error, which is offset jitter like, and is always at the current ripple level. This unusual waveform distortion is often masked by other jitters and noise sources and therefore is typically not given in the relevant literature. However, the distortion is difficult to filter out, and it may be harmful, particularly in applications with low rated motor current. The proposed waveform correction scheme uses the readily available motor states in shaft-sensorless drives and does not require major computational effort. Experimental results show that the scheme recovers the α-β current waveforms and, as a result, prevent the increase in the sixth harmonic ripple in the d-q currents, which is inherent to the PWM inverter-controlled drives. Consequently, drives with the dc shunt will neither have current signal offset problems nor the need for d-q current signal prefilters with order significantly higher than usual.
69 citations
TL;DR: A new onboard charger for plug-in hybrid electric vehicle that has a cascade structure of a high-frequency resonant converter with a constant switching frequency for electrical isolation and discontinuous-conduction-mode buck-boost converter for charge control and harmonic regulation of input current under universal line input is suggested.
Abstract: This paper suggests a new onboard charger for plug-in hybrid electric vehicle. It has a cascade structure of a high-frequency resonant converter with a constant switching frequency for electrical isolation and discontinuous-conduction-mode buck-boost converter for charge control and harmonic regulation of input current under universal line input. This structure uses small link capacitors so that high-voltage electrolytic capacitors that are not preferable to be used in automotive applications due to its short lifetime can be removed. The feasibility of the proposed charger has been verified with single-phase and three-phase prototypes.
69 citations