| Summary: | 碩士 === 健行科技大學 === 機械工程所 === 101 === Naturally exhaust fans have both good effects of exhausting indoor heat and guiding outdoor fresh air convection, however, the kinetic energy generated by them while exhausting heat to outside is wasted; therefore, this study used a permanent magnet brushless generator additionally installed on the main shaft of a natural exhaust fan to achieve the double effects of both heat dissipation and power generation. When the fan is rotated by wind power, the magnet disc will rotate along with the fan, so that the stationary coil disc will cut through magnetic field lines to generate power.
The research method was divided into three parts, the first part is to analyze the magnetic field strength and the magnetic flux density of the permanent magnet brushless generator; the second part is the structural design of the permanent magnet brushless generator, 2 magnet discs were designed to correspond with 1 coil disc, wherein 8 strong rubidium-iron-boron magnets were placed on the magnet discs and 12 induction coils were placed on the coil disc to generate electricity; and the third part is the conversion and the storage of the generated energy.
The types of the analyzed permanent magnet brushless generators are 2:1 (permanent magnet: induction coil) and 1:2 (permanent magnet: induction coil). From the analysis results, it is known that the magnetic flux density of type 2:1 (permanent magnet: induction coil) is better, its minimum value of magnetic flux density is 0.1068T and maximum value is 0.3489T; from the experimental results, it is known that it can output AC voltage 18.83V and DC voltage 10V when the rotation speed of the natural exhaust fan is at 60rpm, and can output AC voltage 121.83V and DC voltage 55V when the rotation speed is at 300rpm.
Existing natural exhaust fans installed on roof of plant category buildings can take advantage of this power system to generate electricity, the electricity generated can be inputted into storage battery, and then outputted through the battery to provide lighting inside plant, such that both cooling and lighting functions can be achieved at the same time.
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