Certain level of mechanical deformations in winding does not hamper the normal performance of power transformer. However, such incipient deformations if unattended could result in permanent failure of transformer. To this end, an approach is proposed to assess the severity of mechanical deformations in transformer winding. These deformations get reflected as changes in its high frequency behavi...

The paper considers aspects of scalar V/f control, vector control and direct torque (and flux) control (DTC) of an emerging cost-effective technology for limited speed range applications the brushless doubly fed reluctance machine (BDFRM). Apart from giving a comprehensive review of the various control methods, its major contribution is the presentation and experimental verification of a sensor...

Rotor and stator temperature are of concern in both shortterm machine protection and in longer term condition monitoring for large induction machines. Especially, when operating with overload cycles, it is necessary to monitor rotor bars and stator winding temperatures to make sure that the temperature remains below prescribed limits. The purpose of this paper is to present a thermal monitoring...

This study presents an analytical model (ANA) for predicting magnetic field and performances of a fractional slot (FS) double-layer-winding (DLW) vernier permanent magnet (VPM) machine. Magnetic vector potential equations FS DLW VPM machine are analytically solved by the technique variable separation in three subdomains, that is, regions magnets (PM), air-gap, slots 2-D polar coordinate system....

Analysis of the behaviour of the Brushless Doubly Fed Machine (BDFM) has received considerable attention in the literature. The BDFM is typified by its complex airgap flux distribution. This paper will build upon performance-prediction work, concentrating on the design and electromagnetic behaviour of the BDFM rotor, considering 2 different sizes of 4/8-pole stator machines and comparing test r...