A torque control strategy of brushless DC motor with low resolution encoder

Author

Huh, Uk-Youl ; Lee, Je-Hie ; Lee, Tae-Gyoo

Author_Institution

Dept. of Electr. Eng., Inha Univ., Inchon, South Korea

fYear

1995

fDate

21-24 Feb 1995

Firstpage

496

Abstract

This paper describes a torque controller with an observer for a brushless DC (BLDC) motor. The torque control strategy needs accurate position and speed information, but the BLDC motor has a low resolution internal encoder to determine switching position. Therefore, the speed and the intermediate position are obtained from a stable estimator which would be derived from nonlinear modelling. The torque control algorithm is derived for a motor of arbitrary back-EMF waveform considering the freewheeling current. It would be possible to have accurate speed control for wide range of speed without torque ripple. The proposed system is easily implemented and computation time is reduced by new motor modelling. In the experiment, the controller is realized by a DSP TMS320C31. The effectiveness of the controller is shown by simulation and experiment

Keywords

brushless DC motors; control system analysis; control system synthesis; digital control; machine control; machine testing; machine theory; observers; power engineering computing; torque control; DSP TMS320C31; arbitrary back-EMF waveform; brushless DC motor; computation time; control design; controller; experiments; freewheeling current; low resolution encoder; motor modelling; nonlinear modelling; simulation; switching position; torque control strategy; Brushless DC motors; DC motors; Frequency; Pulse width modulation; Rotors; Sampling methods; Servomechanisms; Signal resolution; Stators; Torque control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Drive Systems, 1995., Proceedings of 1995 International Conference on

Print_ISBN

0-7803-2423-4

Type

conf

DOI

10.1109/PEDS.1995.404872

Filename

404872