| Summary: | 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.
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