| Summary: | 博士 === 國立交通大學 === 電機與控制工程系 === 92 === Some researches are made for the spindle motor in the optical data storage device in the thesis. For examples, an analytical method for calculating the incremental line inductance of a spindle motor is proposed. Furthermore, some approaches to estimate the inductance, the resistance, the flux linkage, the moment inertia, and the damping coefficient of the motor are announced and an automatic method to judge the pins assignment of the motor is raised. In this thesis, The analytical method to calculate the incremental inductance of a spindle motor is computationally more efficient than Finite Element Method. In addition, this new approach to measure the inductance and the resistance without any fixture to lock the rotor can replace the conventional locked-rotor test. Contrary to the conventional no-load test, the proposed method needs no extra servomotor and the flux of the motor can be easily estimated. Besides, this thesis discloses a new method to estimate the rotation position of the rotor, which is treated as the feedback signals to identify the moment inertia, and the damping coefficient of the motor. Finally, we announce an automatic method to judge the pins assignment of the spindle motor, then any motors with different brands all can be automatically driven to measure their performance. Some experiments or simulations are used to verify the theories announced in this thesis.
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