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Specific testing requirements for qualifying electrical resistance trace heating for use in industrial applications in ordinary locations, as well as a basis for electrical and thermal design, are included in this standard.
The aim of the reduction method is to integrate the reduced model in a multi-physical electric machine optimization procedure and use the obtained model in real-time monitoring of machine critical parts. In this paper, an electric machine thermal model reduction method is proposed. Using the lumped parameter thermal network (LPTN) method, a thermal model is developed in order to represent the thermal...
In this paper are described some principles and new methods underlying the temperature adjustment in an laboratory electrical furnace. Due to high thermal inertia, classical Proportional-Integral-Derivative algorithms are difficult to be implemented when a high precision temperature adjustment is required. An original software algorithm written in C language performs the temperature control function,...
The paper aim is to analyze the way in which the electrical load influences the infrared thermal images of the thermal stresses of electrical equipment determined by using infrared thermography devices. In order to obtain a reliable result of the infrared investigations several conditions must be accomplished, such as good definition of the correction parameters and choosing the optimal environmental...
The demand of heat of the urban consumers registers rather great variations from one season to another. The thermal load curve flattening, in hot and intermediate seasons, is possible due to the accumulation of heat during the periods of time when the heat consumption is low and its utilization during the thermal load peak periods. The paper analyzes the integration of heat accumulation using water...
This paper presents the current status of the studies performed to analyze the so called intermittent buoyancy induced flow phenomenon, or IBIF for short, and also, to introduce the future CFD model that will be used to study the phenomenon in certain conditions. By definition, IBIF is characterized by intermittent flow of the coolant in individual channels. For this type of cooling to be validated,...
According to electronization for car, many units which have thermal sources are mounted in vehicle and some heated units are broken down in operation. This problem can be caused by a big accident. Because of this problem, heat generation of electronic unit is a big issue in a recent automotive business. Recently, most automakers and auto-parts suppliers always have been tried to rapidly predict or...
Visible Light Communication is an emerging technology in Optical Wireless Communication where the Light Emitting Diodes (LEDs) are utilized for transmission of data. The luminance of the LEDs increases with the forward current; however, for high current levels the heat generated by non-radiative recombination of carriers increases the LED junction temperature, decreasing the efficiency and the lifetime...
In power supplies the request for further miniaturization and increased power density results in dissipation issues. For a good thermal performance, a proper cooling of the dissipating devices is essential and hotspots in the application should be prevented. This means that next to a good electrical design, also a good thermal analysis and thermal design is needed to optimize the thermal behaviour...
This paper discusses the problem offitting parameters of a detailed circuit thermal model when the complete data on problem geometry or material properties are not available. The problem is illustrated based on a practical example of a test hybrid circuit. Unknown model parameter values are determined here from dynamic temperature measurement results which were processed employing the Network Identification...
In this paper, the effect of changes in the width of teeth and yoke on stator temperature characteristics was analyzed. An initial model of fill factor 45% was produced. The validity of the temperature analysis using the thermal equivalent circuit method was experimentally verified. A basic model was selected as the initial model. Also, a temperature characteristic analysis was performed for various...
For deep ultraviolet light emitting diodes (DUV-LEDs) packaging, the choice of substrate directly affected its performance and reliability. In this paper, a structure was proposed to promote thermal management and lifespan of DUV-LEDs by introducing the ceramic substrate with copper filled thermal hole. The AlN ceramic substrates with different number of copper filled thermal holes were fabricated...
In order to accurately analyze the effect of temperature difference on the stress distribution of the test docking basket under vacuum and low temperature environment, according to the measured temperature data of the docking basket, the force-thermal coupling model of the docking basket in vacuum and low temperature environment was established. The equivalent stress is 275MPa, which exceeds the yield...
We evaluate a method for localization of thermal source by using optical probing. A two-dimensional imaging of infrared radiation is commonly used as localization of thermal source. At the flow of failure analysis, thermal lock-in (LIT) method by InSb camera is used to detect a leakage and short point in a package and power device sample. However, an accuracy of localization is not enough due to the...
The power elements are the weak parts of integrated circuits (ICs), in fact, through these elements the power is usually dissipated as heat. This provides two effects: non-uniform generation of the heat across the die and temperature gradients. Understanding this phenomena is very important for choosing the right location of sensitive components, like thermal sensors, in order to improve reliability...
In-wheel motor is one of the expected electric vehicle technologies which has superiority in the vehicle control aspects. However, the integrated in-wheel motor in which the inverter is integrated with the motor makes thermal problems because of the reduction of cooling area. This paper analyses a cooling system of the inverter integrated in-wheel motor and considers the operating conditions of the...
This paper discusses the effect of uneven axial magnet temperature of permanent magnet assisted synchronous reluctance motor (PMa-SynRM) on unbalanced magnetic pull (UMP). The loss generated in stator and rotor contribute to temperature rise in the motor. Commonly, radial direction thermal analysis has been done while assuming constant temperature in axial direction of a machine. However, the uneven...
A high reliability of light emitting diode (LED) light sources is essential for general and automotive lighting applications, where exchange of LED components is expensive. Thermal management of modern high power LEDs is crucial for their lifetime. An important aspect is the thermal path for heat conduction. Many different defects can have an influence on this path of an electronic system: on the...
This paper presents the analytical thermal analysis of a permanent magnet generator stator coil. The analytical analysis consists of a lump parameter thermal network (LPTN) to predict the steady state and transient temperature of the coil module. In the steady state part the average temperature of different parts of the network are estimated by using the matrix inversion and an iterative loop. In...
Eutectic AuSn solder is increasingly used in high reliability and/or high temperature applications where conventional Pb-free solders exhibit insufficient strength, creep resistance, thermal conductivity, and resistance to corrosion. Excessive void presence and growth and irregular phase formation are critical factors governing the solder joint reliability as long as they act as crack initiation sites...
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