Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
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Speed Sensorless Stator Flux-Oriented Control of Induction Motor in the Field Weakening Region Using Luenberger Observer

루엔버거 관측기를 이용한 약계자 영역에서 유도전동기의 속도 센서리스 고정자자속 기준제어

  • Kuen Tae-Sung (Dept. of Electrical Engineering, Hanyang Univ.) ;
  • Shin Myoung-Ho (Dept. of Electrical Engineering, Seoul National Univ. of Technology) ;
  • Hyun Dong-Seok (Dept. of Electrical Engineering, Hanyang Univ.)
  • Published : 2002.11.01
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Abstract

In a conventional speed sensorless stator flux-oriented(SFO) induction motor drive system, when the estimated speed is transformed into the sample-data model using the first-forward difference approximation, the sampled data model has a modeling error which, in turn, produces an error in the rotor speed estimation. The error included in the estimated speed is removed by the use of a low pass filter (LPF). As the result, the delay of the estimated speed occurs in transients by the use of the LPF This paper investigates the problem of a conventional speed sensorless SFO system due to the delay of estimated speed in the filed weakening region. In addition, this paper proposes a method to estimate exactly speed by using Luenberger observer, The proposed method is verified by experiment with a 5-hp induction motor drive.

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