An alternative sensorless field orientation method

Author

Ritter, C.M. ; Silvino, J.L.

Author_Institution

Centro de Pesquisa e Desenvolvimento em Engenharia Eletrica, Univ. Fed. de Minas Gerais, Belo Horizonte, Brazil

Volume

14

Issue

4

fYear

1999

fDate

12/1/1999 12:00:00 AM

Firstpage

1335

Lastpage

1340

Abstract

This paper proposes a sensorless vector control method to achieve field orientation in induction motor drive systems. The field orientation strategy is based on the concept of varying the stator frequency with respect to a slip difference. A general equation for calculating the slip in any reference frame is developed. A reduced order discrete rotor flux observer with small sensitivity to rotor resistance and slip variations is used. The whole control system operates in a synchronously rotating frame. Only stator voltages and currents are sensed. A different approach in implementing this method through a frequency PID is also presented. Simulation results are used to verify the validity of the proposed alternative sensorless field orientation technique

Keywords

frequency control; induction motor drives; machine vector control; magnetic flux; observers; rotors; slip (asynchronous machines); stators; three-term control; discrete rotor flux observer; field orientation; field orientation strategy; frequency PID; induction motor drive systems; reduced order discrete rotor flux observer; rotor resistance sensitivity; sensorless field orientation method; sensorless field orientation technique; sensorless vector control method; slip calculation; slip difference; stator currents; stator frequency variation; stator voltages; synchronously rotating frame; Costs; Frequency; Induction motor drives; Induction motors; Machine vector control; Rotors; Sensorless control; Shafts; Stators; Voltage;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/60.815069

Filename

815069