Ideal integration of observers with sinusoidal states by Sliding Mode - Application to Direct Field Orientation of motor drives

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Direct Field Orientation (DFO) is a well-established method for field-oriented control of induction motor (IM) or permanent magnet synchronous motor (PMSM) drives. In DFO, the rotor position angle is computed using the tan1 function of the stationary reference frame fluxes or EMFs. It is typical to estimate these quantities using an observer based on the respective motor model. The paper discusses the problem of integrating the equations of this observer: generally, pure integration cannot be implemented because of the offsets in the measured signals; integration is replaced with low pass filtering. This produces estimation errors that are significant when the drive operates at low speed; the errors propagate in the rotor position. The paper discusses an interesting property of Sliding Mode Observers: under the same offset conditions, because of the discontinuous feedback used, SM Observers allow ideal integration of the observer equations. Thus, low pass filtering is avoided, the estimates have no phase errors and the resulting rotor position is more accurate than in observers with continuous feedback. The paper analyzes the general case and studies the PMSM as an example. The theoretical claims are validated with simulations and experimental tests.

Original languageEnglish (US)
Title of host publication2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011
Pages1082-1087
Number of pages6
DOIs
Publication statusPublished - Sep 14 2011
Event2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011 - Niagara Falls, ON, Canada
Duration: May 15 2011May 18 2011

Publication series

Name2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011

Other

Other2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011
CountryCanada
CityNiagara Falls, ON
Period5/15/115/18/11

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All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

Comanescu, M. (2011). Ideal integration of observers with sinusoidal states by Sliding Mode - Application to Direct Field Orientation of motor drives. In 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011 (pp. 1082-1087). [5994752] (2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011). https://doi.org/10.1109/IEMDC.2011.5994752