| Summary: | 博士 === 國立成功大學 === 機械工程學系碩博士班 === 95 === As the trend toward compact sizes in 3C (computer, communication and consumer) electronic products, the required motor drives in these applications need to be downsized with increased power densities. It appears that the winding of motors is the most awkward part to be scaled down from conventional motor design when miniaturizing. Hence, this thesis mainly presents an optimal motor design procedure to develop a slim-type and high-speed axial-flux motor. The motor design applies two winding fabrications, which are flexible printed circuit board winding (FPCBW) and micro-electroformed winding (MEW). Both of them represent an ultra-thin electromagnetic exciting source where coils could be design as any shape in order to improve the motor performance.
The proposed design procedure integrated with the genetic algorithm (GA) and magnetic circuit analysis, which could calculate the related motor parameters effectively. According to the procedure, a slim-type and high-speed axial-flux motor is designed and prototyped. The prototype uses rhomboidal PCBW to reduce the end-winding length and minimize the copper loss. In addition, the prototype of MEW is fabricated and shows the effectiveness of the micro-electroforming procedure for the development of slim-type motors.
At last, a commercially available motor drive IC can be effectively adapted to make the motor work at higher speed, and excellent agreement is found between simulation and measurement. This thesis also proposed the technique to measure the back-EMF waveform without any coupling, and an indirect method to determine torque-speed characteristic curve for the motor. These would avoid the mechanical destruction from coupling. Experimental results also indicated that the slim-type motor can be effectively adapted to work in 3C electronic products, giving it some promising applications.
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