| Popis: |
The design and fabrication of a rotating electromagnetic generator of low-speed and small bicycle were presented in this study. In accordance with the standard of generator the finite element analysis was used to design the prototype generator. In the simulation, the different parameters of the magnet, coil and iron yoke were set into the Taguchi method to find the best configuration. The parameters included the magnet poles, coil size, wire thickness, winding way, with or without iron yoke, and the distance between the magnet and yoke. When a permanent magnet is moved relative to a coil, an electromotive force is created. According to the theory of electromagnetic induction, the electricity was generated by the electromagnetic power generator. In this study, power produced by the relative motion between coil and magnet. This project innovatively uses Low-Temperature Co-fired Ceramic(LTCC) technology to fabricate micro-coil, and the required magnetic characteristics of permanent magnet are produced by sintered Nd-Fe-B. The technology and simulation were combined to achieve the requirements of lightweight, compact, high energy density. A prototype of the micro-generator is 50x50x4.5 mm3 in volume size. The 28 poles hard magnet Nd/Fe/B with an outer diameter of 50 mm and a thickness of 2 mm was molded and sintered, and provides the magnetic field of 3.5 Tesla. The coils with a width of 200£gm, a pitch 100£gm and the thickness of 40£gm were fabricated by silver. The coils had 30 layers and 22 poles. A steel yoke can improve the efficiency of power generation. The results of induced electromotive force were 0.61, 0.97 and 1.45V at the rotational speeds of 37rpm, 74rpm and 111rpm respectively in the simulation. |
