Title :
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
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;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2006.880854
