DocumentCode :
1112142
Title :
A Newly Designed Instantaneous-Torque Control of Direct-Drive PMSM Servo Actuator With Improved Torque Estimation and Control Characteristics
Author :
Mohamed, Yasser Abdel-Rady Ibrahim
Author_Institution :
Waterloo Univ., Waterloo
Volume :
54
Issue :
5
fYear :
2007
Firstpage :
2864
Lastpage :
2873
Abstract :
In this paper, a newly designed instantaneous-torque-control scheme with improved instantaneous-torque estimation and control characteristics in a direct-drive permanent-magnet synchronous motor (DD-PMSM) is presented. A hybrid control structure that combines the internal-model principle and the variable-structure control approach is proposed. The appropriate control voltage vector is determined using the control effort of the variable-structure torque and d-axis current controllers combined with the estimated dynamic back-EMF vector in a feedforward control manner. Subsequently, the dynamic back-EMF vector, which contains the flux-harmonics information, is included in the reference voltage generation as an internal model. As a result, better disturbance rejection can be obtained with the proposed cascaded control structure. To robustly obtain the instantaneous-torque information, an adaptive motor model is proposed. The adaptive model is realized by adopting recursive estimators to estimate unknown machine electrical quantities and parameters. In addition to its robust estimation performance, the proposed adaptive model includes the dynamic model of the estimated disturbance to enhance the estimation characteristics. Experimental results are presented to demonstrate the validity and effectiveness of the proposed instantaneous-torque-control scheme.
Keywords :
cascade control; electric current control; feedforward; machine vector control; permanent magnet motors; servomotors; synchronous motor drives; torque control; cascaded control structure; d-axis current controllers; direct-drive PMSM servo actuator; dynamic back-EMI vector; feedforward control; flux-harmonics information; hybrid control structure; instantaneous-torque control; permanent- magnet synchronous motor; recursive estimators; torque estimation; variable-structure control approach; voltage vector control; Adaptive estimation; direct drives (DD); instantaneous-torque control; permanent-magnet synchronous motor (PMSM); variable-structure control (VSC);
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2007.901356
Filename :
4298159
Link To Document :
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