Title :
Analysis of half-wave rectified brushless synchronous motor with permanent magnets
Author :
Oyama, Jun ; Higuchi, Tsuyoshi ; Abe, Takashi ; Yamada, Eiji
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Nagasaki Univ., Japan
Abstract :
A theoretical study of a half-wave rectified brushless synchronous motor is described. The field of the new type of brushless synchronous motor is excited not only by the field current obtained by rectifying the EMF in the field winding with a diode, but also by permanent magnets. The EMF is induced by the MMF which rotates at synchronous speed and pulsates at bias frequency. The characteristic equations are derived, and the effects of modulation function waveform and excitation method on the performance characteristics are investigated. The calculated results of the performance characteristics agree well with experimental results. It is confirmed from the theoretical study that the triangular wave is most advantageous for the modulation function and that the use of permanent magnet excitation improves the power factor.<>
Keywords :
machine theory; permanent magnet motors; synchronous motors; brushless synchronous motor; excitation method; half wave rectified motor; modulation function waveform; performance characteristics; permanent magnets; power factor; triangular wave; Circuits; Diodes; Equations; Induction motors; Magnetic analysis; Permanent magnet motors; Rotors; Stator windings; Synchronous generators; Synchronous motors;
Conference_Titel :
Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-87942-553-9
DOI :
10.1109/IAS.1990.152178
