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The estimation of electrical losses is a basic requirement for motor design based on efficiency optimization. A utility and accurate electrical loss calculation method for induction motors utilizing 2-D finite element analysis is proposed in this paper. The stator copper losses are directly calculated on the basis of Joule's Law; the rotor copper losses are expressed as the integration of current...
A watt-range contactless electromechanical energy harvester based on the interaction of a rotating permanent magnet wheel with a moving conductive surface is analyzed, modeled and optimized. The extracted models are verified with two-dimensional (2-D) finite-element-method (FEM) simulations and measurement results. Finally, a ρη-Pareto optimization indicates a power density of the harvester wheel...
Misalignment in wirelessly charged electric vehicles is unavoidable as perfect alignment of the pickup coil on the electric vehicle with respect to transmitter is quite difficult. Notably, even a small coil misalignment leads to significant reduction of the effective coupling. Due to which this problem is of quite significance for maintaining high efficiency over the complete misalignment range. This...
This paper deals with the unbalanced forces due to the rotor eccentricity. It describes two analytical models suitable for surface permanent magnet machine and synchronous reluctance machine, suitable to predict the flux density with a non-uniform air gap. The radial force on the rotor of the two machines is estimated in case of different rotor eccentricities, at no load and under load conditions...
In this paper, a five-phase hybrid-excitation flux-switching (HEFS) machine with “E”- core stator cell is proposed and analyzed. The topology and operation principle are investigated. Moreover, the armature winding connection method is analyzed and the analytical sizing equations are derived to determine the main design parameter of HEFS machine. The electromagnetic performance, including the conventional...
Crossed dipole coils for the wide-range 3-D omnidirectional inductive power transfer (IPT) are proposed. Free positioning of a plane receiving (Rx) coil is obtained for an arbitrary direction within 1m from a plane transmission (Tx) coil. Both the Tx and Rx coils consist of crossed dipole coils with an orthogonal phase difference; hence, a rotating magnetic field is generated from the Tx, which enables...
This paper presents the design optimization and performance analyses of a wound-field type brushless synchronous machine (WF-BSM) for traction drives in hybrid electric vehicles (HEVs). Research on a WF-BSM with free rare-earth magnet becomes an attractive research topic recently due to several advantages of robust rotor structure, high power capability that suitable for high-speed motor drive system...
The most common practice when designing high speed synchronous reluctance (SyR) machine consists in performing the electromagnetic design followed by a finite element rotor structural verification at the maximum operating speed. This approach could lead to sub-optimal designs because it neglects the effect of the rotor structural parts on the electromagnetic performance and vice versa. In order to...
The paper describes the application of a brand new approach to evaluate magneto harmonic effects in round geometries. Largely employed regular modeling approaches such as Dowell or homogenization methods show important lacks of accuracy for 2D modeling. They are not able to reflect many physically existing phenomena like side effects and empty layers of conductors e.g, what require Finite Elements...
The proposed inductive power transfer (IPT) system for laptop charging consists of three parts: a high frequency power supply from a full-bridge inverter with frequency modulation, a LLC resonant tank that incorporates a loosely coupled transformer (LCT) and a resonant capacitor series connected with the primary winding, and a rectification output circuits that uses a full-bridge diode rectifier....
The main technological challenges issues of ultra-deep-water umbilicals is taken to reliability of integrated high-voltage power cables and production umbilical (IPU) by electromagnetic interference and high thermal effect. Due to their functional intergraded system and cost-effectiveness, the aim of this study is to evaluate the thermal and electromagnetic characteristics of a large bore central...
With the development of large capacity variable speed constant frequency wind turbines, wind power converters with the multi-chip paralleled insulated gate bipolar transistor (IGBT) modules are widely used as an energy flow interface, a valid junction temperature calculation is vital considering the multichip electro-thermal influences, because thermal analysis is of great significance in terms of...
This paper presents a high-speed 3 kW 80 krpm surface-mounted permanent magnet (SMPM) motor for compressor applications. The design procedure using finite element analysis (FEA) is presented with a particular focus on the efficiency calculation. The paper also aims to give general indications to provide a cost-efficient solution. A prototype is built and experimental results are given and compared...
The curved permanent magnetic linear machine (PMLM) is a particular type of machine that can satisfy same special utilities. A curved PMLM for a golf training swing system (GSTS) is presented. The curved PMLM drives the carriage along the ring up-down. Neglecting the saturations and the end effect, the analysis method generates large error at high force outputs. The 3D FEA method is adopted to study...
This paper investigates demagnetization characteristics of rare-earth permanent magnets used in electric machines. A test fixture was designed and built to induce controllable local demagnetization in the magnet sample under test. A range of demagnetizing magnetomotive force (MMF) was applied to force the magnet samples to operate at various points along their B-H curves. The degree of demagnetization...
An optimal design of internal Ferrite permanent magnet motor with embedded key FEM verification is presented with the scope to increase the efficiency of the small power motors without to use the expensive, rare earth permanent magnets. Two internal flux concentration topologies are analyzed and the geometric dimensions and performances are presented for three cases, all at 1kW rated power at 4500rpm...
Two different power circuit structures have been proposed for a five-level hybrid active neutral-point-clamped (5L HANPC) converters. In order to reduce the size/weight of the converter system, PCB-mounted film capacitors were selected as DC-link banks. The two arrangement of the existing power semiconductor modules are compared in this paper. The comparison includes dimension, weight, parasitic parameters,...
Permanent-magnet synchronous machines (PMSMs) are considered a very promising machine type for high-speed applications nowadays. As permanent-magnet (PM) materials are generally fragile, a high strength sleeve is required to protect the PMs from damage due to extreme centrifugal forces. The rotor sleeve occupies space of the effective air gap of the PMSMs, so it is difficult to perform the electromagnetic...
This paper considers the electromagnetic and structural co-design of synchronous reluctance (SyR) machines for high-speed applications, with the aid of optimization algorithms. The aim of this work is twofold. First, three commercial electrical steel grades are compared to establish quantitatively how steel properties influence the performance of high-speed SyR machines. The considered steel grades...
This study aims at minimizing the acoustic noise from a magnetic origin of a claw-pole alternator. This optimization is carried out through a multiphysic simulation which includes the computation of magnetic forces, vibrations and the resulting noise. Therefore, a mechanical model of the alternator has to be developed to determine its main modes. Predicted modal parameters are checked against experimental...
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