Direct Torque Control Method of Induction Machine with Constant Average Torque

일정한 토크 평균치를 가지는 유도전동기 직접토크제어기법

  • 김정옥 (경북대학교 전자공학과) ;
  • 조내수 (경북대학교 전자공학과) ;
  • 최병태 (경북대학교 전자공학과) ;
  • 김우현 (영남이공대학 전자정의계열) ;
  • 임성운 (경일대학교 컴퓨터제어.전기공학부) ;
  • 권우현 (경북대학교 전자공학과)
  • Published : 2003.11.21

Abstract

There are several types of switching table for selection voltage vector in direct torque control of induction motor. In general, two-quadrant and four-quadrant operation switching table are used mostly. Two-quadrant operation has an advantage that reduced the torque ripples in comparison with four-quadrant operation, but it has the defect that is not constant average torque. Because the torque increasing slope size by non-zero voltage vector is different from the torque decreasing slope size by zero voltage vector as speed region. The main objective of this study is to maintain constant average torque using two-quadrant operation switching table. In proposed method, the torque increasing slope or decreasing slope are calculated before selected voltage vector is applied. Then, it is applied to zero voltage vector or non-zero voltage vector until the torque increasing slope and decreasing slope are equal. In total magnitude. Therefore it becomes to maintain average torque at whole operation speed. The validity of the proposed method is proven by simulated and experimental results.