Title :
Instantaneous torque estimation in sensorless direct torque controlled brushless DC motors
Author :
Liu, Y. ; Zhu, Z.Q. ; Howe, D.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK
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 non-sinusoidal back-emf 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 being validated by simulations and measurements.
Keywords :
Kalman filters; brushless DC motors; machine control; nonlinear filters; observers; permanent magnet motors; torque control; variable structure systems; extended Kalman filter; instantaneous electromagnetic torque; nonsinusoidal back-emf waveform; permanent magnet brushless DC motors; rotor speed estimation; sensorless direct torque control; sliding mode observer; torque estimation; Brushless DC motors; Electric variables control; Electromagnetic measurements; Electromagnetic scattering; Equations; Rotors; Sensorless control; Sliding mode control; Torque control; Torque measurement;
Conference_Titel :
Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005
Print_ISBN :
0-7803-9208-6
DOI :
10.1109/IAS.2005.1518743
