| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 94 === The thesis mainly uses the finite-element method (FEM) to simulate the properties of magnetic fields and electrical circuits for the single-phase brushless dc motor. In addition, the author makes the complete analysis for the inductance of the motor and utilizes the related results computed by FEM to establish three kinds of simulation models for the motor driving system.
In the analyses of magnetic fields and electrical circuits, the distribution of static magnetic fields and the waveform of the cogging torque are simulated. Then the properties of electrical circuits including the inductance, back EMF voltage, and the actual condition of the motor operated at constant speed are simulated. The simulation results of electrical circuits are compared with the measurement results in order to understand the accuracy of the simulation. In addition, a single-phase brushless dc motor needs the asymmetric stator structure to obtain the starting torque, so the thesis also discusses the further effect of the asymmetric stator.
In the former analysis of the inductance, it doesn’t consider the effects of the rotor angle and coil current, so the author makes the further analysis about their affection. The symmetric condition of the magnetic fields is utilized to derive the corresponding results in order to reduce the computing time of simulation. At last, the related results computed by FEM are used to establish the three kinds of simulation models for the single-phase brushless dc motor driving system. The simulation results for the three kinds of models are finally compared with the measurement results and the comparative accuracy among them can be obtained from the related comparison.
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