Instantaneous Torque Estimation in Sensorless Direct-Torque-Controlled Brushless DC Motors

Author

Liu, Yong ; Zhu, Zi Qiang ; Howe, David

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. of Sheffield

Volume

42

Issue

5

fYear

2006

Firstpage

1275

Lastpage

1283

Abstract

A key issue in the direct torque control of permanent-magnet brushless dc motors is the estimation of the instantaneous electromagnetic torque, while sensorless control is often advantageous. A sliding-mode observer is employed to estimate the nonsinusoidal back-electromotive-force waveform, and a simplified extended Kalman filter is used to estimate the rotor speed. Both are combined to calculate the instantaneous electromagnetic torque. The effectiveness of this approach is validated by simulations and measurements

Keywords

Kalman filters; brushless DC motors; machine control; nonlinear filters; permanent magnet motors; power filters; rotors; torque control; electromagnetic torque; extended Kalman filter; nonsinusoidal back electromotive force waveform; permanent magnet brushless DC motors; rotor speed estimation; sensorless direct-torque-control; sliding mode observers; torque estimation; Brushless DC motors; Electric resistance; Electric variables control; Electromagnetic measurements; Industry Applications Society; Magnetic separation; Rotors; Sensorless control; Space vector pulse width modulation; Torque control; Direct torque control (DTC); extended Kalman filter (EKF); permanent-magnet motor; sliding-mode observer;

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/TIA.2006.880854

Filename

1703721