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Instantaneous Torque Control of Electric Motor Drives

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4 Author(s)
Ilic-Spong, Marija ; Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 1406 West Green Street, Urbana, IL 61801, USA. ; Miller, Timothy J.E. ; MacMinn, Stephen R. ; Thorp, James S.

In the control of adjustable speed drives, the performance of inexpensive digital integrated circuits is approaching the stage where traditional control algorithms may be displaced by new algorithms that better exploit their speed and the functional capabilities of their software. The concept of ``instantaneous torque control'' is introduced as an objective worth pursuing in the application of such digital IC's to drive systems. Instantaneous torque control would in principle permit the fastest possible response and the elimination of torque ripple, along with many other advantages not possible with conventional control algorithms, most of which are set up to control a time-averaged torque. Some of the fundamental principles of instantaneous torque control are developed for the switched reluctance motor, which is used as an example because, like the brushless dc permanent-magnet motor with concentrated windings, it has the potential for rapid response, but it can have appreciable torque ripple with unfavorable firing angles. A reference frame transformation that would eliminate the rotor position from the voltage and torque equations is not known for either of these machines. This opens up a number of interesting questions as to the generality of instantaneous torque control algorithms, and whether they can be incorporated into the general or unified theory of electrical machines.

Published in:

Power Electronics, IEEE Transactions on  (Volume:PE-2 ,  Issue: 1 )

Date of Publication:

Jan. 1987

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