Results 261 to 270 of about 349,224 (309)

Variable Speed Wind Energy Conversion Using Synchronous Machine

IEEE Transactions on Aerospace and Electronic Systems, 1985
A power generation scheme using a synchronous generator with an excitation control system driven by a variable-speed wind turbine is described. The proposed scheme has been analyzed over a wide speed range and under wind gusting conditions. Performance characteristics show that it is feasible to use variable-speed fixed-pitch wind turbines to generate ...
G. Raina, O.P. Malik
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Online variable speed drive machine monitoring

2020
Electrical machines in VSDs have been reported to be less reliable than those fed direct -on-line from the grid mains, see Montanan. This is because the voltage supply imposes extra stresses when synthesised by a power electronic converter. Our focus here is on drive systems using voltage source converters (VSC) where the DC link is capacitively ...
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Computer-aided design of electrical machines for variable speed applications

IEEE Transactions on Industrial Electronics, 1987
In recent years, the product life cycle has decreased and demands for new products have emerged due to competition, modern industrial needs and rapidly changing technology. This has necessitated changes in design, development and manufacturing processes so as to improve quality and efficiency as well as reducing costs. Computer Aided Design (CAD) helps
R. Krishnan, S. Aravind, P. Materu
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Synchronous machine control in variable speed operation

International journal on hydropower & dams, 2014
Design requirements for synchronous machine operation include variable speed regime. In hydropower units that use compensation operation, it is necessary in some cases use motor starting. In pumped-storage plants, to increase turbine efficiency, continuous operation in a variable speed regime should be considered.
Šundrica, Marijo, Maljković, Zlatko, Erceg, Igor   +2 more
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Handbook of Asynchronous Machine with Variable Speed

2013
This handbook deals with the asynchronous machine in its close environment. It was born from a reflection on this electromagnetic converter whose integration in industrial environments takes a wide part. Previously this type of motor operated at fixed speed, from now on it has been integrated more and more in processes at variable speed.
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Variable Speed Induction Machines

2012
This chapter discusses the means for the speed change of induction machines. The speed regulation is required in both generators and motors. Induction machines that serve as generators in wind power stations revolve at variable speed. Therefore, the machine and the associated equipment must ensure conversion of mechanical work in electrical energy at ...
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Vibrations in Variable Speed Machines

1988
In a wide range of dynamically loaded machines variable speeds occur which lead to time-dependent excitation spectra of forced vibrations, passages through resonances and other phenomena. Some examples of the basics of these instationary vibrations are discussed and the most important mathematical relations for instationary forced vibrations of linear ...
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Temperature rises in electrical machines on variable load and with variable speed

Proceedings of the IEE Part A: Power Engineering, 1956
In selecting an electrical machine it is required to estimate how hot the windings will become when the most onerous duty anticipated is performed. This has been difficult when the duty involved varying loads and speeds. Relationships are given by which such estimates may be based on the results of temperature measurements on a machine of the type in ...
A. Tustin, J.J. Bates
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Variable-Speed Induction Machine Performance Computed Using Finite-Element

IEEE Transactions on Industry Applications, 2011
This paper describes a finite-element (FE) procedure particularly suitable for the prediction of a controlled induction motor (IM) performance. The FE analysis is carried out in the rotor flux reference frame so that only magnetostatic FE simulations are used, reducing the computational time.
ALBERTI, LUIGI, BIANCHI, NICOLA, BOLOGNANI, SILVERIO   +2 more
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Self excitation of a variable-speed constant-frequency machine

Proceedings of the Institution of Electrical Engineers, 1968
Consider a machine having a 3-phase stator and a wound rotor with commutator and brushes; the brushes rotate at a constant speed. The rotor is driven at a variable speed and fed from the stator through a transformer and a rectifier. This machine, thus excited through the rotor by a direct voltage, produces an alternating stator voltage of constant ...
R. Gadenz, A. Cruzat, G. Pesse, A. Sabat
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