MODELING AND PERFORMANCE ANALYSIS OF OUTPUT ENHANCED TRANSFER FIELD (TF) MACHINE

Ahmed R. Salihu; Linus U. Anih

doi:10.4314/njt.v44i2.13

Authors

A. R. Salihu Department of Electrical Engineering, University of Nigeria, Nsukka, 410001 Nsukka, Enugu, Nigeria
L. U. Anih Department of Electrical Engineering, University of Nigeria, Nsukka, 410001 Nsukka, Enugu, Nigeria

DOI:

https://doi.org/10.4314/njt.v44i2.13

Keywords:

Transfer field, Rotor induced current, Capacitance injection, Coupled machine, Swapped windings, Improved outputs

Abstract

The output performance of a conventional transfer field (TF) machine is low in comparison with those of other asynchronous machines. In this study, a reconfigured transfer field machine with simultaneous rotor induced currents and capacitance injection for enhancement is presented. The machine comprises two identical salient-pole machine elements that are coupled mechanically and wound integrally for the same pole number. The salient-pole half axes are displaced in space quadrature in the machine elements comprising the machine. Each stator has dual sets of identical poly-phase windings regarded as primary and secondary that are sinusoidally distributed in the stator slots. Primary windings are interconnected in series between the machine elements and the terminals connected to public utility source while the secondary windings are swapped betwixt the machine elements and then terminated on a balanced variable capacitor bank. Windings are also placed on the rotors. The mathematical model of the machine is derived, the resulting equations therefrom are simulated in MATLAB/Simulink environment. It is shown that with an optimized value of tuned capacitor, a remarkable improvement in the performance characteristics of the machine over the traditional TF machine is obtained when compared. The starting torque, power factor and maximum torque increased by 384.2% (1.9N-m to 9.2N-m), 87.5% (0.32 to 0.6) and 374.1% (6N-m to 28.45N-m) respectively, which confirm superior performance characteristics.

Author Biographies

A. R. Salihu, Department of Electrical Engineering, University of Nigeria, Nsukka, 410001 Nsukka, Enugu, Nigeria

Ahmed R. Salihu had Bachelor of Engineering (B.Eng.) Degree in Electrical and Computer Engineering from Federal University of Technology, Minna, Nigeria. He acquired Masters of Engineering (M.Eng.) Degree in Power Systems and Machines from University of Benin, Benin-City, Nigeria. He is currently with University of Nigeria. He is a corporate member of Nigerian Society of Engineers (NSE), a corporate member of Nigerian Institute of Electrical and Electronic Engineers (NIEEE) and registered with the Council for the Regulation of Engineering in Nigeria (COREN). His research interests are Power devices, Machines and Drives.
L. U. Anih, Department of Electrical Engineering, University of Nigeria, Nsukka, 410001 Nsukka, Enugu, Nigeria

Linus U. Anih was born on 23rd of September, 1959. He received B.Eng. degree in 1984, M.Eng. degree in 1988 and Ph.D. degree in 1999, all in Electrical Engineering from Anambra State University of Science and Technology Enugu, Obafemi Awolowo University, Ile-Ife and University of Nigeria, Nsukka respectively. He has been teaching at the University since 1989 and rose to the rank of Professor in 2009. He was the head of the Department of Electrical Engineering, University of Nigeria, Nsukka from 2000 – 2003; Director, Computer Communications Centre (UNN) from 2012 – 2014; Director, Students Industrial Works Experience Scheme from 2011 – 2017. He is a member of the Nigeria Society of Engineers (NSE), a member of IEEE and a member of the Council for the Regulation of Engineering in Nigeria (COREN). His research interest is in coupled reluctance machine and has published widely in reputable journals.

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