Title :
Investigation into a class of brushless DC motor with quasisquare voltages and currents
Author :
Bolton, H.R. ; Liu, Y.D. ; Mallinson, N.M.
Author_Institution :
Imperial College of Science and Technology, Department of Electrical Engineering, London, UK
fDate :
3/1/1986 12:00:00 AM
Abstract :
The results of an investigation into brushless DC drives with quasi-square wave voltage and current waveforms are presented. Practical results are used to check the validity of a time stepping analysis for the prediction of instantaneous currents and torque. The analysis is then used as a design aid in drawing up designs of brushless DC motor incorporating `square-wave¿ features. The influences of phase number and inverter switching instants on performance are examined. Optimised designs for motors incorporating two types of permanent-magnet materials, ferrite and iron/rare-earth, are included.
Keywords :
DC motors; electric current; electric drives; electric potential; torque; Fe-rare earth permanent magnets; brushless DC drives; brushless DC motor; ferrite permanent magnets; instantaneous currents; instantaneous torque; quasisquare currents; quasisquare voltages; time stepping analysis;
Journal_Title :
Electric Power Applications, IEE Proceedings B
DOI :
10.1049/ip-b:19860015