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On the Damper Cage Bar´s Currents Calculation Forsalient Pole Large Synchronous Machina

Liliana Vicol, Attila Banyai, Ioan-Adrian Viorel, Jean Jacques Simond

DOI:


Abstract

The damper cage bars’ currents occur only when the synchronous machine operates in a dynamic regime and its rotor speed differs from the stator field speed. Basically there are two ways of calculating the damper cage currents, by using the machine equivalent circuit or by employing a 2D or 3D finite element method (FEM) analysis. In this paper are discussed
two methods to calculate the damper cage currents, one based on a coupled field-circuit approach when all the machine dimensions and winding should be known and another based on DC-decay tests conducted with the rotor on d, respectively q axis when all the transient parameters and time constants are obtained. Both methods are quite simple and offer an acceptable accuracy.

Keywords


Synchronous machine; finite element method; rotor.

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