asynchronous machine

asynchronous machine

[ā′siŋ·krə·nəs mə′shēn]
(electricity)
An ac machine whose speed is not proportional to the frequency of the power line.
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The authors deduced that the torque of the double star asynchronous machine is produced only by the flux/current interactions in a plane, conventionally called (d, q) as in the case of three-phase machines.
1) include: TK--a thyristor switch of a cycloconverter type with natural switching as which a direct thyristor frequency converter (DTFC) serves, G-asynchronized generator as which as a three-phase asynchronous machine with a phase rotor, the coils of which the rotor phases are connected in a star serves.
Induction Generator) is the type of asynchronous machine. The term 'doubly fed' refers that the voltage on the stator can get the energy from the grid and the voltage on the rotor is induced by the power converter.
The mechanical part of the drive consists of the PMSM and working mechanism, which is simulated in laboratory conditions by an asynchronous machine. The PMSM is mechanically connected to the frame and together with the asynchronous machine make up machine set (see Fig.
In this paper, the complicated stator system of a three-phase asynchronous machine is simplified to a continuous elastic structure with two coaxial cylindrical shells.
To represent the voltage and the frequency characteristics of an asynchronous machine during simulation, this paper proposes a novel simplified third-order transient model by redefining the variables and parameters of the traditional model.
Handbook of asynchronous machine with variable speed.
From all the renewable energy electricity production systems, the wind turbine systems are the most used specially the doubly fed asynchronous machine based systems, the control of theses systems is particularly difficult because all of the uncertainties introduced such as: the wind speed variations, the electrical energy consumption variation, the system parameters variations, in this paper we focus on the robust control ([H.sub.[infinity]] controller design method) of the doubly fed asynchronous machine which is the most used in the wind turbine system due to its low cost, simplicity of construction and maintenance [1].
Sequential-function chart programming doesn't accommodate asynchronous machine operations that don't fall easily into the sequential structure.
The asynchronous machine model is used and consisted of an electrical part represented by a fourth-order state space model and a mechanical part model in the form of a second-order system.
In paper [1], [2] an investigation of operating stability of a multi-phase (six-phase) non-symmetric asynchronous machine, which operates in transmission mode under effect of various disturbances, was performed.

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