| Summary: | 碩士 === 元智大學 === 電機工程學系 === 90 === The key point of our study is to improve the performance by changing the assemblage of the claw-poles stepping motor used in the scanner. The upper and lower stators are separated in different intervals with different materials.
Generally, there is an interaction between the detent torque and the holding torque. In order to get lower detent torque, we tried to eliminate the inherent magneto-coupling interaction occurred between the stator and the magnetic rotor. If the sharp variations from the detent torque appeared, the typical pattern of the sinusoidal wave of the holding torque might seriously be distorted. Thus, the disturbance can directly affect the accuracy of the step angle. That’s the reason why we need the lower detent torque. It is known that the better performance can be obtain by decreasing the detent torque as the motor operated at high speed. Therefore, lower detent torque can decrease the vibration and the noise to increase the accuracy of the step angle. If this work can be accomplished, the resolution of the scanning will be improved substantial.
Most researches on stepping motors focus on their electrical properties, especially in designing the control circuit of the driver. However, few papers reported the performance of the motors with the magnetic—circuit simulation technique. We examined the simulation results with a serious of experimental data. That will help us to confirm whether the models used in the simulations are correct and acceptable or not. If they work, we can build up the fundamental models for miniaturizing the stepping motor. Consequently, we can reduce the cost whenever we develop a new motor.
|
|---|
