Interturn faults are a significant problem in power transformers that can eventually burgeon into catastrophic and likely result an overall network failure. The main with SFRA as one of the well-recognized diagnostic tools for detecting winding is its restriction to domain offline testing since method requires injection test signal transformer windings through high-voltage bushings. To address difficulties arising from this issue, contribution, new technique online transfer function...

This paper investigates a novel online method for static eccentricity (SE) fault detection of single-stator-single-rotor axial flux permanent-magnet (AFPM) machines. The allows both estimating the SE factor and computing minimum air-gap position. As direct measurements are expensive, proposed is based on measurement voltages three search coils uniformly distributed in air gap. Unlike current spectrum-based methods which winding configuration has considerable impact, can be used any type AFPM...

Matrix converters are a well-known class of direct AC–AC power converter topologies that can be used in applications, where compact volume and low weight necessary. For good performance, special attention should paid to the control scheme for these converters. The model predictive strategy is promising, straightforward flexible choice controlling various different matrix topologies. This work provides comprehensive study detailed classification several methods techniques, discussing...

This paper studies the effects of static eccentricity on axial flux permanent-magnet machines (AFPMMs) using three-dimensional finite-element analysis (3-D FEA). Use numerical modeling makes it possible to precisely study in these types machines. The accuracy FEM model is validated experimental measurement. To best awareness authors, AFPMMs have not been studied before. Hence, a new definition for factor (SEF) presented and shown that occurrence very high A motor with different degrees rotor...

This paper proposes an application of a new electric motor topology named ring-winding axial flux machine (AFM) for rim-driven thruster ship propulsion system. Ring-winding AFM has many advantages, such as reliability, simple construction, ease increasing phase numbers, and pole which are important marine application. In thruster, the is fitted in duct surrounding propeller so that integrated into one unit. Due to this integration, design more affected by hull. presents method determine...

Permanent Magnet (PM) machines have attracted much attention due to their high power-torque density, efficiency, dynamic response performance, power factor, and simple structure. Even though there are some uncertainties about reliable chain supply, PM still the first choice for high-performance applications. Therefore, paying development improvement of performance these types electric is great importance. One challenges vulnerability Irreversible Demagnetization (ID), especially applications...

High-voltage power supplies are so important in today's world. Some of the characteristics a supply efficiency and perfect performance short circuit conditions. ‎This article presents new high-voltage ‎ resonant converter using an LCCL network that can provide these two goals. This has advantages such as removing adverse effect transformer stray capacitor, optimal conditions, achieving soft switching, high efficiency. The incorporates full bridge inverter, which provides several benefits....

This study discusses a brushless permanent magnet (PM) generator. A high‐efficiency interior PM (IPM) generator has been designed. It is suggested to use three‐phase, 12‐/10‐pole for the auxiliary power unit application. In this regard, compute components of flux density distribution in air gap an IPM generator, hybrid analytical model employed. The unique aspects work include development 2‐dimensional (2‐D) method determine magnetic as well first‐ever replacement stator slot with surface...

This paper presents the analysis, design, and implementation of a cost-effective sensorless control technique for low-cost four-switch, three-phase inverter brushless dc motor drive. The proposed is based on detection zero crossing points (ZCPs) three voltage functions that are derived from filtered terminal voltages nu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ao</sub> xmlns:xlink="http://www.w3.org/1999/xlink">bo</sub> . Six commutation...

This paper studies static eccentricity (SE) fault detection in axial-flux permanent-magnet (AFPM) machines using 3-D finite-element analysis. The use of numerical modeling makes it possible to precisely study the these types machines. simulations are validated experimental measurements. To best knowledge authors, SE AFPMs has not been studied before. Hence, a new definition for factor is presented A motor with different degrees rotor simulated, and back electromotive force (EMF) all coils...

Design and optimization of synchronous reluctance machine for medium-speed flywheel energy storage system (FESS) applications is presented in this paper. High efficiency high torque density are the main design criteria motor/generator electromechanical systems. Moreover, salience ratio appropriate stator required to achieve a acceptable machine. In paper, effects key parameters on performance investigated an procedure based response surface methodology coupled finite-element model performed...

One of the most important issues that power companies face when trying to reduce time and cost maintenance is condition monitoring.In electricity market worldwide, a significant amount electrical energy produced by synchronous machines.One type these machines brushless generators in which rectifier bridge mounted on rotating shafts.Since terminals are not accessible this generators, it difficult detect possible faults bridge.Therefore, paper, method proposed facilitate fault detection.The...

EVs have gained significant attention due to their independence from fossil fuels, as well ability reduce greenhouse gas emissions. In this paper, a bidirectional CLLC resonant converter for EV charger applications is proposed, in which the voltage stresses of its power switches are reduced half input while it can transfer high values. A detailed analysis operating principle and characteristics provided paper. Several factors contribute achieving efficiency by using proposed converter,...

Abstract In this article, three dual‐stator axial field flux‐switching permanent magnet (DS‐AFFSPM) topologies are selected, designed, and analysed in order to determine the most effective structure electric vehicle (EV) application based on torque density, power efficiency. Accordingly, introduced thoroughly compared same condition. The results show that, high‐power high‐torque high‐efficiency, of internal single‐teeth rotor DS‐AFFSPM topology is a suitable candidate for EV because it has...

With growing environmental concerns and the limitations of fuel cell resources, replacing petrol-based engines with electric machines as traction motor for vehicles (EVs) is gaining attention. Among different topology, lower power applications such three-wheel motorcycle, Brushless Direct Current (BLDC) motors are most favorable due to their simple structure, control algorithm, etc. One key aspects developing BLDC in EV utilizing fast efficient optimization algorithm over driving cycles....

The switching table based direct power control (ST-DPC) of three-phase PWM rectifier is analysed and an improved (IST-DPC) presented. proposed schedule improves the quality line current results in better dynamic performances. In addition, predictive (PDPC) boost presented simulation (in MATLAB/SIMULINK environment) are compared with those generated by ST-DPC ISD-DPC approaches. Advantages limitations each scheme highlighted conclusions regarding applications, waveforms burden calculations

Interturn short circuit faults are the leading cause of power transformer failures. If not quickly detected, these usually develop into more serious that would result in irreversible damage to transformer, unexpected outages and consequential costs. This contribution is aimed at obtaining a better understanding physical behaviour transformers presence interturn as well extracting several features be useful specify faults. To this end, circuit-coupled time-stepping finite-element model (FEM)...

A modified configuration for Permanent Magnet Assisted Synchronous Reluctance Motors (PMaSyRM) is studied in this paper. Conventionally, the PM materials are inserted flux barriers region of rotor. Consequently, PMs sizing parameters will be restricted to available space that may limit efficient use benefits. In study, a portion rotor structure replaced with an Interior (IPM) so axially segmented integration IPM and SyRM obtained. Thus, design performed specifically segment independent...

Abstract The two‐dimensional (2D) analytical model for the calculation of components flux density distribution in air gap a dual‐stator axial‐field flux‐switching permanent magnet (PM) motor (DSAFFSPM) is presented. novelties this study are deriving 2D hybrid and replacing rotor teeth with some surface currents air‐gap magnetic first time DSAFFSPM motor. DSAFFSPMs more challenging due to doubly salient structure inner PM stator. 1D interior PMs transferred bore stator body using equivalent...