ELECTRICAL AND COMPUTER ENGINEERING SEMINAR SERIES
Dr. Mbika Muteba
Electrical and Electronic Engineering Technology
University of Johannesburg
Tuesday, June 25, 2019
11:00 a.m. – 12:00 p.m.
“Design Guidelines of Transverse-Laminated Synchronous Reluctance Motors for Electric Traction Options”
Although the traction in Electric Vehicles (EVs) requires high efficiency, good overload performance under the limited battery capacity condition, effective temperature distribution, high power density, high ratio torque per mass, and good dynamic response under different driving cycles, it inevitably also requires less torque ripple content.
This presentation provides guidelines that need to be taken into account during the design process of a transverse-laminated synchronous reluctance motor (TLSynRM) for electric traction options that require less torque ripple content. The presence of microscopic design variables of the rotor entails that any modifications to the number, arrangement and dimensions of the flux barriers will yield significant changes in the performance of the TLSynRM. This makes the design process quite expensive, as advanced optimization techniques are usually required.
The high torque ripple content in transverse-laminated synchronous reluctance motors is mainly caused by the interaction between field harmonics of the electrical loading and the rotor anisotropy. This includes the variation of the d-and q-axis inductances, the oscillation of the Carter’s Factor due to stator slot opening and rotor cut-off opening, and the oscillation of the circulating flux component along the q-axis. The inevitable presence of the stator design variables such as the number of slots, the phase spread, the number of phases, the winding configuration, and so on, dictates the environment in which a successful TLSynRM rotor anisotropy is designed. This presentation scholarly elaborates how the rotor design dimensions are selected in conformance with the stator design variables in order to obtain a transverse-laminated synchronous reluctance motor that develops torque with less ripple content, suitable for electric traction options.
Mbika Muteba is a senior lecturer in the Department of Electrical and Electronic Engineering Technology at the University of Johannesburg in South Africa (SA). He teaches subjects in the field of electrical machines and drives to undergraduates and graduate students. He also provides supervision to numerous Masters students who are conducting full research on the design of electrical machines for various applications. Mbika holds a PhD in Electrical and Electronic Engineering from University of Johannesburg, which he obtained in 2018. He also holds a Bachelor’s and Master’s (cum laude) of Technology in Electrical engineering from Tshwane University of Technology (SA).
Dr. Muteba is a member of the institute of electrical and electronic engineers (IEEE) and the Industry Application Society (IAS). His research interests are design and control of high performance electrical machines for electric traction motor options and renewable energy technologies. He is currently reviewing peer review articles for IEEE Open Access, IEEE Transactions on Industry Applications, Energy Conversion, Power Electronics and Industrial Electronics. He has authored more than thirty technical papers in the field of electrical machines, which have been published in peer review conference proceedings and journals. His most recent work focused on the design of high performance synchronous reluctance machines, dual stator winding poly-phase induction machines, and advanced stator winding configurations for alternating current poly-phase machines.
Dr Muteba is also a professional engineering technologist registered with the Engineering Counsel of South Africa (ECSA), in line with the Sidney accord of June 2001. Since obtaining his first electrical engineering undergraduate degree of applied Science and Technology in 1996, he has gained vast experience working for various companies in South Africa and the Democratic Republic of Congo. He has been involved in a number of projects in the design and maintenance of electrical and mechanical water infrastructure; high and low voltage electrical power reticulation systems; machine drives and power electronics control for heating, and ventilation and air conditioning (HVAC) infrastructure.
Dr Muteba is also a consultative specialist engineer on a $2,5 million project that deals with the maintenance of the HVAC infrastructure for Bombardier Transportation in South Africa.
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