| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 93 === Abstract
Due to the influence of greenhouse effects and the fast consumption of limited petroleum, the goverment of each nation has implemented different energy conservation policies to reduce the impact to the environment as well as enhance its national competitive power. Presently, lots of induction motors have been applied to drive various compressors、 pumps、 refrigerators and fans in refrigeration and air conditioning systems. In fact, it is the major motivation of this research to try to simplify the existing mature induction servo motor control technique and apply to the refrigeration and air conditioning systems where accurate control performance reguirement is not very critical.
Basically, the major contributions of this thesis may be summarized as follows. First, a novel rotor flux oriented control strategy for induction motors is proposed to obviate the use of two current sensors as well as two voltage sensors. As a result, the cost can be reduced without scarifying the dynamical performance of the conventional rotor flux oriented control. Second, a new speed estimator is proposed for estimating the motor speed to obviate the use of an expensive encoder. Third, in view of the negative impact due to detuning effect of parameter variations, a new on-line parameter identification method is proposed to update the parameters of the controller. Finally, a fully digital controller is implemented based on the proposed theoretional basis for the induction motor drive, by using a high speed digital signal processor, namely DSPTMS320F2812. Naturally, not only the number of hardware components can be reduced but also the system reliability and flexibility are enhanced.
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