Design of a closed-loop controller for mitigation of torque ripple in a brushless DC machine

Author

Beccue, P. ; Pekarek, S. ; Neely, J. ; Stutts, D.

Author_Institution

Dept. of Electr. Eng., Univ. of Missouri-Rolla, Rolla, MO, USA

Volume

4

fYear

2003

fDate

15-19 June 2003

Firstpage

1664

Abstract

Brushless DC machines with nonsinusoidal back-emf are often characterized by significant torque ripple that occurs as a result of the interaction of back-emf and stator current harmonics, as well as cogging torque. In this paper, a method of mitigating the torque ripple is described that utilizes closed-loop feedback control. Specifically, the torque ripple produced by a machine is measured using a piezoelectric sensor. The sensor is constructed from polyvinylidene fluoride (PVDF) film, which produces a voltage in response to subtle strains in the motor housing. The sensed torque ripple provides a feedback that is used to determine stator current harmonics utilizing a controller that is based upon cost function minimization. Simulation and experimental results are used to demonstrate the effectiveness of the control technique.

Keywords

brushless DC motors; closed loop systems; control system synthesis; feedback; machine control; piezoelectric transducers; power conversion harmonics; stators; torque control; PVDF; brushless DC machine; closed-loop controller design; closed-loop feedback control; cogging torque; cost function minimization; motor housing; nonsinusoidal back-emf; piezoelectric sensor; polyvinylidene fluoride film; simulation; stator current harmonics; strains; torque ripple mitigation; Capacitive sensors; Cost function; DC machines; Feedback control; Forging; Piezoelectric films; Stators; Torque control; Torque measurement; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialist Conference, 2003. PESC '03. 2003 IEEE 34th Annual

ISSN

0275-9306

Print_ISBN

0-7803-7754-0

Type

conf

DOI

10.1109/PESC.2003.1217707

Filename

1217707