DSP-Based Robust Stator-Flux-Oriented Induction Motor Drive

• Main Authors: Liu Albert, 劉大川
• Other Authors: Lin Faa-Jeng
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/31743230857697587013

碩士 === 中原大學 === 電機工程研究所 === 86 === To solve the problem of detuning due to parameter variations in the currentdecoupled control of a direct stator-flux-oriented induction motor (IM) drive,two approaches for the rotor time-constant estimation are presented in thisstudy. The first approach is based on the model reference adaptive system (MRAS) using an energy function, and the second approach is based on thesliding mode technique. The estimated rotor time-constant is used to updatethe rotor time-constant in the current decoupled controller on line, whichis designed to decouple the torque and flux in the stator flux field-orientedcontrol. To increase the accuracy of the estimated rotor time-constant, theestimation methods is implemented using a digital signal processor (DSP). Theeffectiveness of the proposed estimation methods is demonstrated by some simu-lation and experimental results. Moreover, the influence of the variations ofmotor parameters to the accuracy of the proposed estimation approach isdiscussed.