Title :
High-performance current regulation and efficient PWM implementation for low-inductance servo motors
Author :
Krah, Jens-Onno ; Holtz, Joachim
Author_Institution :
Kolimorgen, Dusseldorf, Germany
Abstract :
This paper reports on a standard microcontroller implementation of a pulsewidth modulator and near-deadbeat current regulator for high switching frequency. The application is in high-performance positioning systems. The control strategy relies on a simplified machine model without incurring performance degradations. Changes between different modulation strategies are programmed depending on the modulation index. The values of switching time durations are obtained exclusively by decision making, thus minimizing computational load. Features like over-modulation (OVM), dynamic OVM, anti-windup, and reduction of switching frequency at thermal overload are included
Keywords :
electric current control; inductance; machine control; microcontrollers; permanent magnet motors; position control; pulse width modulation; servomotors; switching circuits; synchronous motor drives; PWM implementation; anti-windup; computational load minimisation; control strategy; decision making; dynamic over-modulation; high switching frequency; high-performance current regulation; high-performance positioning systems; low-inductance servo motors; microcontroller implementation; modulation index; modulation strategies; near-deadbeat current regulator; over-modulation; permanent magnet synchronous drive; positioning servo; pulsewidth modulator; simplified machine model; switching frequency reduction; switching time durations; thermal overload; Control system synthesis; Current control; Decision making; Microcontrollers; Modulation coding; Pulse width modulation; Regulators; Space vector pulse width modulation; Switching frequency; Thermal degradation;
Journal_Title :
Industry Applications, IEEE Transactions on
