Title :
Multi-mode microcontroller based PWM modulator suitable for fast vector control
Author :
Couto, Carlos M. ; Martins, JÙlio S.
Author_Institution :
Dept. de Electron. Ind., Minho Univ., Braga, Portugal
Abstract :
This paper describes the development and implementation of a PWM modulator that produces waveforms suitable to control all types of voltage source invertor-fed AC motor drives, from fast vector controllers to high power applications. The modulator provides two basic operation modes: (1) an asynchronous mode, performing an improved version of sinusoidal PWM modulation based on the regular-sampling of a modulating waveform; and (2) a kind of synchronous modulation, where commutation instants are set accordingly to stored pre-calculated optimized PWM patterns. Transition between the two modes can be performed without problems. To implement this PWM control strategy, a 16/32 bit microcontroller is used without any additional components. The system was tested for a small power induction motor and the results are presented
Keywords :
DC-AC power convertors; PWM invertors; induction motor drives; machine control; microcontrollers; modulators; power engineering computing; 16 bit; 32 bit; AC motor drives; PWM modulator; VSI; asynchronous mode; commutation instants; fast vector control; induction motor; modulating waveform; multimode microcontroller; regular-sampling; sinusoidal PWM; synchronous modulation; vector control; voltage source invertor; Equations; Frequency modulation; Frequency synchronization; Microcontrollers; Microprocessors; Pulse width modulation; Sampling methods; Space vector pulse width modulation; Torque; Voltage;
Conference_Titel :
Industrial Electronics, 1995. ISIE '95., Proceedings of the IEEE International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-7369-3
DOI :
10.1109/ISIE.1995.497264
