Generalised theory of the brushless doubly-fed machine. Part 1: Analysis

Williamson, S.; Ferreira, A.C.; Wallace, A.K.

doi:10.1049/ip-epa:19971051

Cited by 217 publications

(130 citation statements)

References 3 publications

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“…Well known, DFM using as an operating motor in comparison asynchronous motor [8] and the synchronous [9,10] is an optimal solution; it is most versatile and has high energy characteristics [11][12][13]. Formation algorithm of ACD polyharmonic operation mode has been developed; it allows changing the oscillation frequency, phase shift and oscillation amplitude.…”

Section: Methodsmentioning

confidence: 99%

Special Modes of AC Drives Operation in the Mining Industry

et al. 2017

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Abstract. This paper presents research of special modes of AC drives operation. The possibility of obtaining of vibrational and vibrationalrotational modes of the AC drives on the basis of multipurpose polyharmonic mode of actuating motor operation is shown. Multipurpose electric motor with improved power characteristics (double-fed machine) has been proposed as the actuating motor of the electroactivator of the coal grizzley. The formation algorithm of polyharmonic operation mode of the double-fed machine is developed. This algorithm allows studying different types of special modes of actuating motor. Research results of dynamic parameters of a universal electric motor of the electroactivator of the coal grizzley are presented. The practical significance of the study of using of double-fed machine in the primary coal processing is shown.

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Section: Methodsmentioning

confidence: 99%

Special Modes of AC Drives Operation in the Mining Industry

et al. 2017

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“…In (Williamson et al 1997), it is stated that the essential requirement for brushless doubly-fed machine action is that the frequency and distribution of currents induced in the rotor by the first air-gap field match that induced by the second. The two stator windings will be then coupled via the rotor, even though they have different pole numbers and may be excited at different frequencies.…”

Section: System Descriptionmentioning

confidence: 99%

A General Model for Describing the Performance of Brushless Doubly-Fed Induction Machines

2010

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This paper presents a generalized model, by which the dynamic and steady-state behaviour of the Brushless Doubly-Fed Induction Machine (BDFIM) can be precisely predicted. The investigated doubly-fed machine has two sets of three-phase stator windings with different pole numbers. The rotor is a squirrel-cage type with a simple modification in order to support the two air-gap rotating fields that are produced by the stator windings and have different pole numbers. The machine model is derived in the qdo-axis variables. The qdoaxes are attached to rotor and hence, it rotates at the rotor speed ( m ). The electromagnetic torque expression is also obtained based on the presented model. The winding function method is applied as a convenient approach that can be used for machine-winding inductances calculations. Sample case studies are introduced to examine the performance of the proposed model in both steady-state and dynamic conditions.

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“…This has been further modified to investigate winding shorts [Williamson and Mirzoian (1985)], broken bars [Williamson, Abdel-Magied and Smith (1987)], rotor eccentricity [Dorrell and Smith (1996)] and inter-bar current [Dorrell, Miller and Rasmussan (2003)], amongst other things. The method has also been used to analyse brushless doubly-fed machines of the induction type [Williamson, Ferreira and Wallace (1997)] and reluctance type [Dorrell (2007)]. All these papers are couched in terms of 3-phase induction machines.…”

Section: Introductionmentioning

confidence: 99%

Matrix analysis techniques in cage induction machines

Dorrell

2009

IJCAT

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Modern analysis techniques for electrical machines are either analytical or use finite element analysis. Both methods are implemented using computational techniques to solve the magnetic circuit and produce performance predictions. This paper puts forward a steady-state impedance matrix method for analysing a split-phase induction machine that is at the leading edge of analytical modelling of induction motors. The method is implemented and verified against an example to illustrate the asynchronous torques in a non-sinusoidal winding. In the second half of the paper it is shown how the technique can be applied to a three-phase machine and the classical per-phase model is obtained from the derivation. The steady-state model derives a mathematical rigorous equivalent circuit that includes the skew reactance term in the rotor circuit.

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Generalised theory of the brushless doubly-fed machine. Part 1: Analysis

Cited by 217 publications

References 3 publications

Special Modes of AC Drives Operation in the Mining Industry

Special Modes of AC Drives Operation in the Mining Industry

A General Model for Describing the Performance of Brushless Doubly-Fed Induction Machines

Matrix analysis techniques in cage induction machines

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