| Abstract |
A simple way of implementing the regular-sampled symmetric PWM switching strategy by microprocessors is described for use in 3-phase induction motor drives. The requirement of maintaining the inverter output voltage-to-frequency (V/f) ratio constant, together with the synchronous nature of the modulation strategy, results in considerable simplification in the system software. The hardware and software details are presented along with the experimentally-obtained PWM switching waveforms. Besides the regular-sampled PWM strategy presented in this paper, it is hoped to report during the conference on a totally new digital pulse-width-modulation technique, which promises to outperform all the existing analog and digital techniques of PWM switching signal generation. |
