'n Ondersoek na die elektromagnetiese verbetering van die induksiesmelting van metale
- Authors: Dorland, Pieter
- Date: 2014-05-29
- Subjects: Induction heating , Induction furnaces , Electromagnetic induction , Electromagnetism
- Type: Thesis
- Identifier: uj:11247 , http://hdl.handle.net/10210/10840
- Description: M.Ing. (Electrical And Electronic Engineering) , The metals manufacturing industry is the link between the mining industry, where the ore is mined, and the manufacturing industries, where metals are utilized to create a wide range of products. Melting processes.are used in the manufacturing of metals from the ore, of which induction melting is one of the possible melting processes. In this study the improvement of induction melting of metals is investigated. A new topology for an induction melting furnace is proposed, and this topology is thoroughly investigated. The induction melting process is influenced by certain user-controlled variables as well as the electromagnetic layout of the furnace. In this study, the influence of these variables on the performance of the furnace are investigated through finite element simulations and insight is also gained into the influence of the electromagnetic layout of the system. An experimental induction melting furnace is described in this study, investigated and compared to the predictions from the simulations. Improvements from structural, thermal and measuring viewpoints are also investigated and implemented.
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'n Vergelykende studie van enkelskakelaarmutators vir induksieverhitting
Fault-tolerance of five-phase induction machines with mixed stator winding layouts : torque ripple analysis
- Authors: Muteba, M. , Nicolae, Dan-Valentin
- Date: 2015
- Subjects: Induction heating , Torque
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/16827 , uj:15812 , Citation: Muteba, M. & Nicolae, D.V. Fault-tolerance of five-phase induction machines with mixed stator winding layouts: torque ripple analysis, the 2015 IEEE International electric machines and drives conference (IEMDC), paper 0308-df-005908, May 2015, U.S.A.
- Description: Abstract The mixed winding layouts proposed in this paper are obtained by combining double and triple layer (DTL) windings in stator slots. Previous work has touched upon on the ability of three-and five-phase induction machines (IMs) with mixed winding layouts to produce torque with less ripple contents. However, their advantage when operating under open-circuited faults is yet to be comprehensively reported. This paper presents the fault-tolerant ability of Fivephase Induction Machines (FPIMs) with mixed winding layouts to produce torque with less ripple contents. The windings are designed as 2-pole and chorded with one slot, thereafter referred to as “DTL-14/15” and when chorded with two slots, thereafter referred to as “DTL-13/15. The magnetic conditions in the FPIMs are analyzed using Finite Element Method (FEM). The results evidenced that the FPIMs with the proposed DTL-14/15 and DTL-13/15 chorded coils reduced the torque ripple by a margin of about 60 % while operating with open-circuited faults respect to FPIMs with conventional double layer (DL) winding of the same coil span and operating under the same conditions. The results also prove that there is a great correlation between FEM (simulation) and experimental results.
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