At high frequency, the winding losses of power transformer due to skin and proximity effects becomes a significant component in the loss calculation of the transformer efficiency. This paper examines the winding losses associated with these effects for planar-type low-profile transformers that are suitable for high frequency high density soft switching power supply application. The transformer ...

Axial flux permanent magnet (AFPM) generators for small-scale wind turbine applications have proven to be a useful design due to their reliability and ease of construction. Their stators have been realized using concentrate coils of enameled copper wires embedded in an epoxy-resin composite mixture. A static setting, opposed to a dynamic machine environment, is utilized to study the steady stat...

Electric machines play an important role in modern energy conversion systems. This paper presents a novel brushless fault-tolerant flux-modulated memory (FTFM) machine, which incorporates the merits of a flux-modulated permanent magnet machine and multi-phase memory machine and is very suitable for applications that require wide speed ranges of constant-power operation. Due to the magnetic modu...

a simple method is described for analysis of transients in power network. the method is developed for analysis of transformer and generator winding resonances due to their interaction with transmission lines caused by switching surges. the method is already used for calculation of overvoltages which had resulted in damages in the transformer winding of a hydro power plant. nonlinearity in the i...

Modeling of convection heat-transfer at the end-windings for thermal networks using lumped-parameters has been widely discussed in literature. Unfortunately, resulting coefficients are highly influenced by end-winding shape, area vicinity end-windings, cooling method this region (if any), as well size and power machine. This makes it extremely difficult designer to choose a suitable coefficient...

Abstract In this work, the non-liner voltage distribution in transformer winding is investigated that occurs due switching and lightning. Transformer winding is modeled in the alternative transients program (ATP) version of Electromagnetic transients program (EMTPRV). EMTP software is used to simulate the very fast transient overvoltage. An experimental setup that consist of , Recurrent surge g...

This paper discusses the design and analysis of a high-harmonic injection-based field excitation scheme for brushless operation wound synchronous machines (WFSMs) in order to achieve higher efficiency. The proposed involves two inverters. One these inverters provides three-phase fundamental-harmonic current armature winding, whereas second inverter injects single-phase i.e., 6th harmonic this c...

The article presents an analysis of the winding type influence on the efficiency of an induction motor. The aim of this work is to choose such a type of stator winding that the induction motor will have the best efficiency by employing minimum winding (copper) mass. Three types of stator windings were considered in the analysis: concentric single layer winding, concentric double layer winding a...

In this paper, an interior permanent magnet (IPM) machine having two sets of windings with different number turns is developed to improve the limited flux-weakening (FW) capability and efficiency, simultaneously. The flux-adjustable range appears be somewhat because maximum inverter voltage high magnetic saturation, which degrades FW capability. To address its restricted capability, a unique wi...

The development of transformer models can be achieved based on experimental frequency response measurements providing access to the windings is available and the physical dimensions are known in order to calculate R, L and C parameter values. Of interest are methods that allow the generation of a suitable model if the R, L and C parameters are unknown and access is restricted to the external te...