| Summary: | 碩士 === 國立清華大學 === 電機工程學系 === 90 === Compared with other motors, the interior permanent magnet synchronous motor (IPMSM) possesses the advantages of high power density, excellent acceleration ability and low noise, etc, and it is gradually applied to industrial applications. The purpose of this thesis is to perform the operating performance improvement and the sensorless control for an IPMSM drive. In order to familiarize with the torque generating characteristics of an IPMSM, its structure and governing equations are first studied. The equivalent circuit parameters of an IPMSM are necessary for making the analysis and design of inverter-fed motor drive. However, they are difficult to obtain accurately via derivation owing to their nonlinear and variant properties. To solve this problem, the practical estimation approaches are developed. For performing the experimental tests, a DSP-based IPMSM drive is established, the necessary sensors, signal conditioners and control schemes are properly arranged to let it can be normally operated as a brushless DC motor (BDCM).
As generally recognized, the dynamic performance of a motor is much affected by its winding current waveforms. A simple robust current controller is developed to improve the winding current tracking control response. As far as the tuning control for IPMSM drive is concerned, the effects of field excitation and commutation instant tunings on the IPMSM drive performances under speed open-loop and closed-loop conditions are first observed analytically and experimentally. The equivalence between these two types of tunings is derived. Then accordingly, an intelligent tuning approach is developed to automatically determine the advance of commutation instant. The minimum current command is achieved to obtain better torque generating capability equivalently. As to the sensorless control for the IPMSM, for avoiding the undesired noise effects caused by the time derivative in making the back electromotive force (back EMF) estimation, a sensorless control approach based on the sensed winding terminal voltage is proposed. The effects of phase difference between terminal voltage and back EMF and the driving performance improvement of the IPMSM drive will be covered by the proposed commutation tuning control. The starting and the speed estimation schemes for the sensorless IPMSM drive are also properly designed. Finally, the feasibility of uni-directional starting based on rotor initial position detection is studied. Effectiveness of all the control approaches developed in this thesis will be demonstrated experimentally.
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