| Summary: | 碩士 === 國立中興大學 === 電機工程學系所 === 107 === Brushless DC motors (BLDC) are widely used in the daily lives. It has the advantages of high efficiency, high torque, quick response, high speed, and low noise. System identification is also an important topic in the electric motor area. It can provide more information for the user to get the state space equation and the response curve. In this thesis, we use the least square approximation method to obtain the unkown system parameters of the equivalent linear motor dynamics.
For sensorless controller design, we first use a state observer with armature voltage and current as inputs to obtain the rotor speed. We then use a 120-degree six-step square wave to control the insulated gate bipolar transistor (IGBT), instead of using an incremental encoder to obtain the rotor data for the speed sensing. Finally, we select the variable structure control to achieve constant speed control.
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