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Sampling-induced resonance in an encoderless vector-controlled induction motor drive.

Ran, L. and Liao, Y. (2004) 'Sampling-induced resonance in an encoderless vector-controlled induction motor drive.', IEEE transactions on industrial electronics., 51 (3). pp. 551-557.


This paper illustrates an effect of sampling in an encoderless vector-controlled induction motor drive with a digital controller. The analysis focuses on the speed observer and the speed control loop which is executed at discrete instants. It is shown that the estimated speed can fluctuate between samples in the speed loop and cause a sustained resonance via feedback. The shaft inertia is not available to smooth the ripple of the estimated speed and the associated resonance could adversely affect the inverter and machine. An analytical model is proposed to evaluate the risk of such a condition in the design and on-site adjustment of control gains. The requirement for a smoothing filter in the speed loop is identified.

Item Type:Article
Keywords:Digital control, Drives, Induction motors, Observers.
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Publisher statement:©2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Record Created:27 May 2008
Last Modified:31 May 2011 10:14

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