Implementation of a PWM regular sampling strategy for AC drives

Author

Richardson, Julian ; Kukrer, Osman T.

Author_Institution

Dept. of Electr. & Electron. Eng., Brunel Univ., Uxbridge, UK

Volume

6

Issue

4

fYear

1991

fDate

10/1/1991 12:00:00 AM

Firstpage

645

Lastpage

655

Abstract

The regular sampling technique offers a feasible basis for the microprocessor control of inverters in pulse width modulated (PWM) AC drives. An implementation of this technique is presented for the speed control of an induction motor in the frequency range 5-105 Hz. Hardware and software design principles are outlined and discussed for an 8 b microprocessor. Spectral analyses of the sampling technique with a sinusoidal modulating function and with a third harmonic added to this function are derived, with emphasis on the fundamental and dominant components. Experimental and computed results are presented for the motor control in steady-state, and for transient current and speed in closed-loop operation, with excellent correlation

Keywords

closed loop systems; digital control; electric drives; harmonics; induction motors; invertors; microcomputer applications; pulse width modulation; velocity control; 5 to 105 Hz; 8 bit; AC drives; PWM; closed-loop; hardware; harmonic; induction motor; inverters; machine control; microprocessor control; regular sampling; software; speed control; Frequency; Hardware; Induction motors; Microprocessors; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Sampling methods; Software design; Velocity control;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.97764

Filename

97764