Development of Current Sensorless Vector-Controlled Drives for Alternating Current Machines

• Main Authors: Song Chu Chang, 張松助
• Other Authors: Sheng Nian Yeh
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/47809802227271793549

博士 === 國立臺灣科技大學 === 電機工程研究所 === 84 === This dissertation presents a novel method for controlling a current sensorless AC drive using partial state estimator to estimate the torque current and a voltage predictor to predict the voltage of voltage source inverter(VSI).. The proposed method is applied to an induction motor and a permanent-magnet synchronous motor(PMSM) speed control systems. In the induction motor speed control system, a speed controller, a torque current estimator, a voltage-predictive voltage-source inverter( VPVSI) and a slip calculator are included, while in the PMSM speed control system, a speed controller, a torque current estimator and a VPVSI are adopted. A new speed control method, sliding mode proportional integral structure, is also presented. Fast response and adaptive field weakening feature above the base speed of induction motor are achieved through a direct software control system based on field orientation with recursive operation between partial state estimation and voltage prediction. A concurrent programming method, multi- task time-sharing structure, is applied in the direct software control program. This results in high efficiency and easy maintenance features for the program. Besides low cost, the simplicity of the proposed hardware system yields high reliability and good maintainability.