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This paper presents a nonlinear reluctance network modeling a tubular surface mounted permanents magnets linear alternator. The ferromagnetic materials saturation is considered. The topology and the reluctance values of the network are automatically computed. The linkage between rotor and stator network is modified for each rotor position. The model allows a transient study and presents a good accordance...
This paper proposes an analytical approach that is generalized for the design of various types of electric machines based on a physical magnetic circuit model. Conventional approaches have been used to predict the behavior of electric machines but have limitations in accurate flux saturation analysis and hence machine dimensioning at the initial design stage. In particular, magnetic saturation is...
The use of concentrated windings have been gaining popularity for use in permanent magnet machines. Here, the authors have attempted to implement concentrated non-overlapping windings (CNW) with an interior permanent magnet (IPM) rotor. This paper illustrates general procedures for the derivation of machine geometry, material choices as well as thermal considerations for designing IPM machines with...
Planar magnetic based design technologies have been widely applied to power design for better cooling and ease of fabrication. The planar transformer and the planar inductor have low profile characteristics compare to the conventional transformer which would be more cubical in volume. High frequency operation of magnetic components is a main key to achieve high power density of the power module. However,...
This paper provides a general overview of the thermal, mechanical and electrical properties of insulation materials used to create durable turbine generator rotor windings. Discussions will include some key concepts related to the material selection and material performance of common insulation components in rotor windings. Common industry testing methods to measure or specify material properties...
This paper covers the work carried out at the Research and Development Department of the plant ldquoElectrotyazhmashrdquo, Ukraine for developing reliable anti-corona systems for high voltage generator windings up to 24 kV. The work included estimating the necessity of application of the slot parts semiconducting system and calculation of its parameters; developing the anti-corona protection design...
THIS paper explores opportunities and challenges in power conversion in the VHF frequency range of 30-300 MHz. The scaling of magnetic component size with frequency is investigated, and it is shown that substantial miniaturization is possible with increased frequencies even considering material and heat transfer limitations. Likewise, dramatic frequency increases are possible with existing and emerging...
In this paper, we propose an adaptive transition disturbance observer for winding machine control. In winding machine control, keeping constant tension on the winding material is one of the most important control objectives. So the reduction of the internal and external disturbance that can cause tension error is important. The disturbance observer is then proposed to solve these problems. But the...
This paper investigates the choice of using preinstalled protection and measurement current transformers (CTs) for the detection of high frequency partial discharge (PD) signals in medium voltage cables by conducting frequency response analysis (FRA) of these CTs and by frequency response modeling. Researchers have developed many high frequency models, mainly for the transient behavior of CTs. While...
This paper illustrates a general design process used for implementing non-overlapping concentrated windings in an interior permanent magnet (IPM) machine for field weakening applications. This design process was verified by finite element analysis (FEA) of a 18-slot, 14-pole model. The optimization process of torque and field weakening performance resulted in a design with thin inter-pole link sections...
Due to limited space availability in vehicular applications, machines with high torque density are required. One of the ways to maximize space is by reducing machine end winding length and increasing its effective stack length. This paper illustrates a general design process used for implementing non-overlapping concentrated windings an interior permanent magnet (IPM) machine for field weakening applications...
A central part of a medium frequency conversion system is the transformer. A medium frequency transformer for railway propulsion may be stressed beyond 30 kV with voltage slopes around 50 kV/mus depending on topology while the geometric dimensions are small. A 170 kVA transformer prototype operated at 4 kHz has been developed and tested. A transient thermal model of the transformer is developed and...
Retrofit of power transformers using high temperature aramid insulation materials in the windings based on the hybrid insulation system has developed over the last two decades. By taking advantage of the higher thermal withstand properties of such insulation materials, a failed unit could be redesigned to increase its average winding rise to 95degC. The windings can then be redesigned to reduce the...
A torus machine is considered to be an advantageous machine configuration that is impossible to produce using traditional laminated core technology. This paper presents a torus machine with the stator winding moulded into a composite core, using the RotoCast technology. The goal of the design and the prototyping is to study the advantages when dealing with a soft magnetic mouldable composite material...
Stray losses outside of windings are a subject of numerous different analyses in the power transformer production industry. The purpose of this paper is to illustrate an approach that combines 3D finite element static magnetic field calculation and nonlinear mathematical programming in a single method derived to increase accuracy of stray losses estimation.
A consistent laboratory reproduction of waveforms during impulse tests with solid insulation materials has been a difficult task. Carbon polyethylene composites can serve as benchmarks for such studies. Experimental results on films and a practical voltage transformer (VT) are shown that can help develop signal analysis tools.
The concept of power transformer design with a symmetric core construction (the hexa-transformer) provides a more compact solution compared to traditional technology based on an E-type core. This paper evaluates parameters of two 100 kVA three-phase transformers built according to both concepts. The evaluation includes calculations of induced voltages, inductances, core losses and weight differences...
The inductor often drives the dc-dc converter size. Thus, the inductor optimization process is required for the most effective design. The paper presents inductor analysis only. The material properties are essential for the design size. In this paper, various magnetic materials are analysed and investigated for use in a practical design. The investigation is concerned with the magnetic material selection...
An educational web-based design tool for permanent-magnet synchronous machines (PMSM) is presented in this article. This tool, named Emetor, has been developed to be used in an undergraduate course on permanent-magnet machines. The technical aspects behind the tool, such as the PMSM's design procedure and the program architecture are presented. The benefits of Emetor in an educational environment...
This paper deals with design and thermal analysis of the superconducting single-phase traction transformer. The purpose is to make an electromagnetic design of single phase superconducting traction transformer and also to investigate a distribution of a heat in a cryogen with liquid nitrogen, known as a high temperature superconducting (HTS) material, using FEM software. The outputs of electromagnetic...
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