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The doubly-fed induction generators operating at synchronous speed offers some advantages. At this working mode, the power flowing in the rotor is not significant and thus the converter rating is reduced considerably. The drive can be implemented with the support of a hydro-dynamically controlled gearbox (Voith) which allows the generator works at a determined speed regardless of the rotor speed....
The circumferential cooling system, which provides highly effective, integrated but low-cost motor cooling, is introduced. This work is focussed particularly on magnetic effects, which arise from the special construction of the stator core. An explanation for the existence of inter-laminar flux is given and equations for the prediction of its absolute value are derived. Two approaches, an analytical...
This paper presents an enhanced direct power control (DPC) algorithm for doubly fed induction generators (DFIG) capable of reducing the common mode voltage (CMV). Nowadays the DFIG is often used in high power wind energy conversion systems (WECS). A common problem of converter fed induction machines are the bearing damages due to the bearing currents. The source of this problem is the common mode...
Wind energy conversion systems using the doubly-fed induction generator (DFIG) are the most commercialized topology worldwide, because this technology uses converters dimensioned for ±30% of the system rated power, thus reducing the equipment cost. The direct connection of the DFIG stator to the electrical system increases its sensitivity to grid disturbances. In this context, this paper analyzes...
Nowadays the doubly fed induction machine is often used as generator in high power windenergy systems. Because of the use of two converters in the generator's rotor circuit bearing damages can occurred specially for this type of machine. So the aim is to reduce the common mode voltage as one cause of bearing currents. Instead of a classic space vector modulation this paper presents the simulation...
Electrical drives employing motors able to directly manage multiple degrees of freedom may result in relevant interest in several application fields, e.g. robotics and tooling machines. In this paper, a new type of rotary-linear permanent magnet motor with one motion of two degrees of freedom has been proposed. Its main performance advantage is its characteristics of decoupling linear and rotary motions...
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