High-performanceudMicrocontroller-Based Transvector-ControlledudPulsewidth Modulator-Induction Motor Drive

摘要

A fully digitalised transvector control PWM-IM drive system based on the M68HC11udmicrocontroller is described. The controller receives a digital speed command from audhost computer via RS-232 interface. The feedback control system employs audtransvector control technique to achieve a high dynamic performance in the estimatedudfrequency range from 5 to 100 Hz. The PWM modulator utilises a computationaludintensive, uniformly sampled sine wave technique at low frequency region while audlook-up table, pattern retrieval method base on the harmonic elimination optimaludtechnique is utilised at high frequency region. The system hardware is mostly basedudon the programmable counters while system software is completely written in C++.