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There is currently a need for magneto-electrical apparatus such as inductors and transformers that operate at hundreds of kHz up to several MHz, or even higher frequency. With this increase in frequency comes the need for electrical insulating materials with increased performance and sustainable lifetimes. The purpose of this paper is to introduce electrical insulation resins present and future, and...
Iron powder is an excellent core material for a wide range of inductors in power electronics applications. A commonly used application for iron powder cores is as the output inductor in a buck pre-regulator in VRM designs. Several examples are discussed in designing inductors for this application. Designs using toroids are discussed as well as designs using the more compact "microcube" geometry.
The tapped converter of the classical switched-mode power converter is an extension of the conventional switched mode power converters. Using the tapped configuration, the control parameter of the converter can be used as tapping. It is found that the conversion has a very wide range of variation as compared with before. The paper introduces this basic concept to give readers a broader understanding...
The electrical industry has utilized the approach to product performance as an electrical insulation system since electricity became commercially available. As the industry grew it became necessary to shift the method of evaluation from actual units to a simpler laboratory model. The focus of this paper is to present the applications of the laboratory approach to today's industrial needs.
This paper presents a three phase dynamic phasor model of static VAR compensator which takes fundamental and fifth harmonic into consideration. The modelling approach is based on the time-varying Fourier coefficient series of the power system variables. By truncating the less important higher order terms and keeping the significant ones, the new dynamic phasor model can realistically simulate the...
This paper uses plastic molded bobbins, headers and toroid mounts used in the electronics industry to highlight quality, safety and environmental trade-offs being made in favor of lower component costs. The trade-offs are often made without understanding the cost and risks being transferred from purchasing to more costly portions of the product manufacturing process, or to the customer.
This paper present the DuPont Engineering Polymers and discuss how the new industry regulations impact lead free (Pb-free) electronic component material selection. The material properties discussed include thermal resistance, flammability rating, moisture absorption sensitivity, dielectric performance, electrical insulation rating, mechanical and processing and environmental needs.
To achieve high precision linear movements, most actuators use a standard rotary motor and couple it to a mechanical rotary to linear translator. However, this is not the most optimum method. For high precision and high speed linear motions, this paper proposes to use dedicated direct-drive linear actuator with intelligent controller to accomplish the job. This type of implementation has the advantages...
Inverters are commonly used in varies motor application. This greatly increases the pulse endurance stress of the wire due to switching transience. A new type of wire with three layers of insulation material has been developed by BCwirereg to overcome aforementioned problem. Which this paper gives brief introduction of the wire, details test procedure, preliminary results with compared with traditional...
This paper presents a new technology to produce highly efficient and low cost heat sinks. The developed die for machining these heat sinks is composed of three parts, which are the conducting-liquid module, special underlay, and pattern. The proposed technology brings about a renovation in design of heat-extrusion dies. It can be utilized to solve a lot of problems in the die design.
The up-to-date mould design for aluminum seamless tube manufacture-using the single action extrusion machine, applying high pressure high speed which produces high temperature to modify material flow direction, using the mould to form aluminum seamless billet, pressing and then obtain the aluminum seamless tube.
Without soldering, this aluminum material can be made into the integrative profiled aluminum. It is suitable for air-conditioning refrigeration, heat sink, warm-air, evaporators for cool-warm exchange, and heating pipes. This compound aluminum-material with high-technology is our invention. It meets the demands of both environmental protection and energy saving when it is applied to condensers of...
In Hong Kong, a number of medium-scale building integrated photovoltaic (BIPV) systems were completed in last few years. These BIPV projects included government building, commercial building, schools, institutional building. The power rating the BIPV system for each project is in the order of tens of kilowatts. Most of these BIPV systems are grid-connected type to eliminate the bulky and troublesome...
Multi-motor synchronization control (MSC) is a key issue in industrial production. Based on the conventional PID algorithmic, a variable gain intelligence control scheme is proposed in this paper. Consequently, this new idea was implemented by PLC controller in the stretch tension & synchronization control system of a wide-fabric heating-shaping machine. Such a system has perfect characteristics,...
Polymer bonded magnetic materials have recently attracted increasing attention from fundamental research to industrial applications in many electromagnetic devices. It is necessary to investigate the properties of these magnetic materials operated under different environmental conditions. In particular, in this work, we investigated the relationship between the temperature and the magnetic properties...
In this paper, we propose a model with flux skin effect to represent the behavior of laminated iron core inductors that are used in switching converters, i.e., for excitation frequencies above several kilohertz. Modeling results show that, the inductor reactance calculated as functions of frequency, laminated thickness, core conductivity and permeability and flux skin effect in the laminated core,...
This paper presents a new control scheme to implement the torque ripple minimization in switched reluctance motor drives. The proposed scheme uses the nonlinear torque sharing function in which two active phases contribute the torque during phase commutation and the torque at other time is produced by an active phase. The flux linkage controller with the hysteresis chopping is employed to trace the...
In this paper, performance study on multilayer Rosen-type piezoelectric transformer (PET) as a potential component for power electronic conversion is presented. The attractiveness of the smart piezoelectric technology is primarily due to its desirable features of miniaturization and the extreme simplicity of the resulting components compared to widely used wire wound conventional magnetics. As a result,...
There is currently a need of magneto-electrical apparatus such as inductor and transformer that operate at hundreds of kHz up to several MHz, or even higher frequency. The material based on polymer-bonded magnetic powder has a feature of the magnetic property and can be used as the power transformer, electromagnetic interference shielding, and power inductor, etc. It is so promising that this material...
IGBT (insulated gate bipolar transistor) is becoming more and more popular in many power applications, since it offers a good compromise between on-state loss, switching loss and easy of use. To develop circuits and systems using theses devices, model and model parameters are needed for use in circuit simulations. This paper presents a procedure for identifying the most IGBT models parameters. As...
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