Design and Tuning for the Sensorless Vector Controllers by High-Frequency Signal Injection of Induction Motor

• Main Authors: Wang Chun-Te, 王淳德
• Other Authors: Liu Chang-Huan
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/30118106663847818153

碩士 === 國立臺灣科技大學 === 電機工程系 === 90 === The purpose of this thesis is to investigate the implementaion of the sensorless vector control technique for induction motor drives at low speeds and extremely low speeds by using the application of fuzzy logic scheme in the parameter tuning of the speed controller of induction motor drives and the mothed of high-frequency signal injection. This thesis develops on-line fuzzy-tuned PI controller for the speed-loop of a sensorless vector controlled drive. The performance of the proposed fuzzy-tuned PI controller is compared with the conventional PI controller whose parameters are determined using the sensorless vector control technique. Moreover, by injecting high-frequency singal to the d-axis voltage command in the synchronous rotating reference frame, and it can get the high-frequency modulating effect of the high-frequency signal and the fundmental rotor flux angle. The information can be utilized to obtain the estimated rotor flux angle and synchronous speed. The rotor speed can estimated by subtracting the estimated slip from the rotor flux frequency. It is shown that the fuzzy-tuned PI controller is more robust than the conventional PI controller in terms of parameter and load variations. An experimental system is implemented using the PC-based motor driver, and the control system is real-time. To test the validity of the proposed approach, simulations and experiments are conducted, and the results confirm the better tracking and disturbance rejection capability of the fuzzy-tuned PI controller. It is also the same capability and feasible by using the fuzzy-tuned PI controller for the high-frequency signal injection sensorless vector control.