Determining the Excitation Voltage of Axial Flux Wound Rotor Synchronous Generator
Abdul Multi, Iwa Garniwa
Abstract
The axial flux wound rotor generator has field winding that must be connected to a dc voltage source. By varying the excitation voltage, its electric performance might be controlled to meet the need of a load voltage attached to its terminal. The designed generator is small-scale capacity which has 1 kW, 380 V and 750 rpm. The generator has a single double-sided slotted wound stator sandwiched between twin rotor. The effect of excitation voltage changes on its performance can be seen from the result of calculations using the given equations. The calculation results reveal electric quantities suited with respect to performance of the machine. If the voltages increase, the losses will decrease; but higher the excitation voltage, higher the efficiency and the terminal voltage. It has been found out that for the excitation voltage11 V, the efficiency and the terminal voltage are 85.12 % and 380V respectively.
M Aydin, S Huang and TA Lipo. Axial Flux Permanent Magnet Disc Machines: A Review, Wisconsin Electric Machines & Power Electronics Consortium, University of Wisconsin-Madison, Madison, WI 53706-1691. 2004: 1-4.
Asko Parviainen. Design Of Axial-Flux Permanent-MagnetLow-Speed Machines And Performance Comparison between Radial-Flux and Axial-Flux Machines, Thesis for the degree of Doctor of Science (Technology). Lappeenranta University of Technology. Digipaino. 2005: 17-19.
JR Bumby, R Martin, Axial Flux, Permanent Magnet Generators For Engine Integration, The 12th International Stirling Engine Conference. Durham. 2005: 1-5.
Jacek F Gieras, Rong-Jie Wang, Maarten J Kamper. Axial Flux Permanen Magnet Brushless Machines. Kluwer Academic Publishers. London. 2004: 1-8.
Ion Boldea. The Electric Generators Handbook: Synchronous Generators. Boca Raton: Taylor & Francis Group. 2006: 7-72-75.
Stephen J Chapman. Electric Machinery Fundamentals. Fourth Edition. Singapore: McGraw-Hill, Inc. 2005: 283-292.
KM Vishnu Murthy. Computer-Aided Design of Electrical Machines. Hyderabad: BS Publications. 2008: 160, 231.
AK Sawhney. A Course in Electrical Machine Design. Delhi: Dhanpat Ray & Co. (P) Ltd. 2005.
