scholarly journals Thermal Modelling and Analysis of A 10HP Induction Machine Using the Lumped Parameter Approach

2021 ◽  
Vol 13 (6) ◽  
Author(s):  
Oti S.Ejiofor ◽  
◽  
Awah Chukwemeka ◽  
Chibuzo Nnonyelu ◽  
Ogbonnaya I.Okoro ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Life Span ◽  
Thermal Model ◽  
Research Work ◽  
Induction Machine ◽  
Thermal Modelling ◽  
Thermal Limits ◽  
Lumped Parameter ◽  
Parameter Approach ◽  
Different Parts

The essence of this research work is to develop a thermal model for an induction machine that will enable the prediction of temperature in different parts of the machine. This is very important first to the manufacturer or designer of an induction machine because with these predictions one can decide on the insulation class limits the machine belongs to. Also modern trends in the construction of machines is moving in the direction of making machines with reduced weights, costs and increased efficiency. In order to achieve this, the thermal analysis becomes very crucial in deciding on what types of insulators and other materials that would be used to make these machines. In industries, the knowledge of the thermal limits of machines if well utilized increases the life span of the machines and reduces downtime; thereby increasing production and profit. Specifically, this paper (i) predicted the temperature limits of the induction machine and its components, (ii) developed an accurate thermal model for an induction machine, (iii) predicted the temperature in different parts of the induction machine using the thermal model and software program and lastly (iv) investigated how the machine symmetry is affected by the nodal configuration.

scholarly journals Development and thermal modeling of an induction machine

2019 ◽  
Vol 8 (4) ◽  
pp. 500
Author(s):  
Oti Stephen Ejiofor ◽  
Ugwu Justin ◽  
Nnadi Damian Benneth ◽  
Ogbuefi Uche
Keyword(s):  
Induction Motor ◽  
Reference Frame ◽  
Temperature Rise ◽  
Thermal Model ◽  
Research Work ◽  
Induction Machine ◽  
Operating Conditions ◽  
Electrical Behavior ◽  
Stator Current ◽  
Physical Measurements

In induction machines, the major concern is the temperature rise since it determines the maximum loading, in an attempt to avoid insula-tion deterioration and eventual loss of motor life. The effect of excessive heat in the motor stator and rotor windings and the stator mag-netic circuit can degrade the developed performance of the machine and also affect the motor loading and life span if not dispensed properly. This research work examines the thermal model for estimating the stator and rotor temperatures in cage induction motor. A state-variable model of the induction is used. The twin-axis stator reference frame is used to model the motor’s electrical behavior, because physical measurements are made in this reference frame. The thermal model is derived by considering the power dissipation, heat transfer and rate of temperature rise in the stator and rotor. The non-linear equations for electrical behavior of the motor and the thermal state equations for the stator and the rotor are solved using the MATLAB/Simulink blocks. This is to give room for the determination of the temperature of the stator and rotor windings inside the induction machine so as to evaluate the thermal stability of the induction motor and to check whether the insulation of the copper windings is sufficient at different operating conditions. It was found out from the thermal model analysis that the temperature of the stator and rotor windings increases due to stator and rotor copper losses which depend on the stator current. As the stator current is increased by increasing the torque, the temperature of each element is consequentially made to increase.  

scholarly journals Evaluation of passive autocatalytic recombiners operation efficiency by means of the lumped parameter approach

Nukleonika ◽  
2015 ◽  
Vol 60 (2) ◽  
pp. 339-345 ◽  
Author(s):  
Tomasz Bury
Keyword(s):  
Hydrogen Generation ◽  
Cooling System ◽  
Component Mixture ◽  
Pressurized Water ◽  
Water Reactor ◽  
Safety Issues ◽  
Loss Of Coolant Accident ◽  
Lumped Parameter ◽  
Core Cooling ◽  
Parameter Approach

Abstract The problem of hydrogen behavior in containment buildings of nuclear reactors belongs to thermal-hydraulic area. Taking into account the size of systems under consideration and, first of all, safety issues, such type of analyses cannot be done by means of full-scale experiments. Therefore, mathematical modeling and numerical simulations are widely used for these purposes. A lumped parameter approach based code HEPCAL has been elaborated in the Institute of Thermal Technology of the Silesian University of Technology for simulations of pressurized water reactor containment transient response. The VVER-440/213 and European pressurised water reactor (EPR) reactors containments are the subjects of analysis within the framework of this paper. Simulations have been realized for the loss-of-coolant accident scenarios with emergency core cooling system failure. These scenarios include core overheating and hydrogen generation. Passive autocatalytic recombiners installed for removal of hydrogen has been taken into account. The operational efficiency of the hydrogen removal system has been evaluated by comparing with an actual hydrogen concentration and flammability limit. This limit has been determined for the three-component mixture of air, steam and hydrogen. Some problems related to the lumped parameter approach application have been also identified.

A lumped-parameter electro-thermal model for cylindrical batteries

2014 ◽  
Vol 257 ◽  
pp. 1-11 ◽  
Author(s):  
Xinfan Lin ◽  
Hector E. Perez ◽  
Shankar Mohan ◽  
Jason B. Siegel ◽  
Anna G. Stefanopoulou ◽  
...  
Keyword(s):  
Thermal Model ◽  
Lumped Parameter

Metallurgical Quality of Feed Ingots and Castings Made from Nickel and Cobalt Superalloys

2013 ◽  
Vol 212 ◽  
pp. 215-220
Author(s):  
Franciszek Binczyk ◽  
Jan Cwajna ◽  
Paweł Gradoń ◽  
Maria Sozańska ◽  
Marek Cieśla
Keyword(s):  
Thermal Analysis ◽  
Quality Assessment ◽  
Shrinkage Cavities ◽  
Different Parts

The paper presents the results of ATD thermal analysis of feed ingots (master heat) and castings made from IN-713C, MAR-247 and MAR-509 superalloys. Metallurgical quality assessment was made based on the analysis of dT/dt curve in rage from Teutto Tsol. Furthermore, impurities (oxides of Al, Zr, Hf, Cr etc.) have been identified inside the shrinkage cavities of feed ingots and castings. Significant similarities has been observed between impurities found in ingots, ATD test samples and finished castings. It has been demonstrated that ATD analysis of samples taken from different parts of feed ingot can be effective method of metallurgical quality assessment for these ingots.

From research desk to policy makers and community: MUHAS research symposia and policy briefs targeting the stakeholders

2020 ◽  
Vol 31 (1) ◽  
pp. 120-122
Author(s):  
Hendry R. Sawe ◽  
Bruno F. Sunguya ◽  
Eligius F. Lyamuya
Keyword(s):  
Research Output ◽  
Research Work ◽  
Health Impact ◽  
Scientific Journals ◽  
Child Transmission ◽  
Policy Makers ◽  
One Year ◽  
The Impact ◽  
Mother To Child ◽  
Different Parts

All too frequent, valuable research output and scholarly materials from expensively conducted research work in different parts of the world end up in research desks, academic libraries, and scientific journals. Muhimbili University of Health and Allied Science (MUHAS) through the Directorate of Research and Publications initiated a series of symposia that aim to disseminate the evidence generated by the researchers to the policy makers and the community. In two of the six conducted University-wide symposia in the last one year, MUHAS produced two important policy briefs summarizing the impact of MUHAS research in two important—though distinct areas of local and global health impact—Elimination of Mother to Child Transmission (EMTCT) of HIV, and Diarrhea diseases.

A Hybrid Lumped-Parameter and Two-Dimensional Analytical Thermal Model for Electrical Machines

2021 ◽  
Vol 57 (1) ◽  
pp. 246-258
Author(s):  
Dawei Liang ◽  
Z. Q. Zhu ◽  
Yafeng Zhang ◽  
Jianghua Feng ◽  
Shuying Guo ◽  
...  
Keyword(s):  
Thermal Model ◽  
Electrical Machines ◽  
Two Dimensional ◽  
Lumped Parameter ◽  
Analytical Thermal Model
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