Patent Application
20070018515
1. Field of the Invention
The present invention generally relates to a power generating device and, more particularly, to an air-driven power generating device using air to drive a planar magnet to rotate such that a planar coil cuts through a magnetic field generated by the planar magnet so as to generate an induced electromotive force (EMF).
2. Description of the Prior Art
With the high development in nano-engineering and micro electro-mechanical systems (MEMS) technologies, industries in many fields such as mechanics, opto-electronics, micro-electronics, materials and bio-engineering have made a breakthrough in product precision, performance and cost.
Even though the new technology makes it possible to design precise devices, the devices are still powered up by external driving devices or power modules that are large in size and hinder the technology from moving towards precision and downsizing.
Energy resources have now become a major issue because of environmental concerns. Therefore, research topics on substitutes such as solar cells, fuel cells and on power generators have attracted a great amount of attention.
For example, U.S. Pat. No. 4,777,394 and U.S. Pat. No. 5,982,059 disclose generators using a cup-shaped supporting shell for fixing a yoke assembly so as to generate an induced electromotive force; however, these patents have disadvantages in that the power generators are large in size. Moreover, U.S. Pat. No. 5,525,842 discloses a power generating device, installed in an air-driven tool, capable of driving a magnet to rotate and thus generate an induced electromotive force using a solenoid; however, this patent is disadvantageous in that the structure is complicated, costly and low efficiency in power generating.
Therefore, there is need in providing an air-driven power generating device to overcome the problems that appear in the prior art.
It is a primary object of the present invention to provide an air-driven power generating device using air to drive a planar magnet to rotate such that a planar coil cuts through a magnetic field generated by the planar magnet so as to generate an induced electromotive force (EMF).
In order to achieve the foregoing object, the present invention provides an air-driven power generating device, comprising: an air-driven portion; a planar magnet, disposed on the air-driven portion and having a plurality of magnetic poles for generating an alternate magnetic field, the planar magnet being driven by the air-driven portion so as to change the alternate magnetic field; a planar coil, disposed apart from the planar magnet for a distance, the planar coil having a plurality of induced regions so as to induce the alternate magnetic field to generate an induced electromotive force (EMF); and a control circuit, electrically connected to the planar coil so as to provide rectification, power storage, and power transmission.
The power generating device of the present invention is applicable to a variety of air-driven tools so that the air-driven tools generate power for illumination for the tool, torque detection, display, digitalization, and so on.
It is preferable that the air-driven portion performs a rotating motion so as to drive the planar magnet to rotate.
It is preferable that the air-driven portion communicates with a pipe with a high-pressure gas flow, thereby driving the air-driven portion to rotate.
It is preferable that the planar magnet is a multi-polar magnet.
It is preferable that the planar coil comprises a plurality patterned coils.
It is preferable that the plurality patterned coils are electrically connected in series or in parallel.
The objects, spirits and advantages of the preferred embodiment of the present invention will be readily understood by the accompanying drawings and detailed descriptions, wherein:
The present invention providing air-driven power generating device can be exemplified by the preferred embodiment as described hereinafter.
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Moreover, the planar magnet 11 rotates with the air-driven portion 10. According to Lenz's Law, the alternate magnetic field generated by the planar magnet 11 changes when the planar magnet 11 rotates. Therefore, the planar coil 12 generates an induced electromotive force (EMF) due to resistance to the change of the alternate magnetic field, leading to an induced current in the closed loop.
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In the present embodiment, the distance between the planar magnet 33 and the planar coil 34 is only exemplary and can be modified by those with ordinary skill in the art. Moreover, modifications on the air-driven rotating means 32 for driving the planar magnet 33 are within the scope of the present invention.
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Moreover, a planar magnet 44 (as a rotator) is fixedly disposed on the rotating clutch 46. A planar coil 45 (as a stator) is fixedly disposed in a second cap 47, which is connected to the first cap 43, so that the planar magnet 44 is apart from the planar coil 45 for a distance and both the planar magnet 44 and the planar coil 45 are installed in a compartment formed by the first cap 43 and the second cap 47. A lighting element 471 is disposed on the front of the second cap 47. Moreover, the size of a clip 461 on the front of the rotating clutch 46 is controlled by a cover 48 so as to tightly hold a tool. The air-driven hand tool 4 further comprises a control circuit 49 that provides rectification, electricity storage and power transmission. As shown in
According to the above discussion, it is apparent that the present invention discloses an air-driven power generating device using air to drive a planar magnet to rotate such that a planar coil cuts through a magnetic field generated by the planar magnet so as to generate an induced electromotive force (EMF). Therefore, the present invention is novel, useful and non-obvious.
Although this invention has been disclosed and illustrated with reference to particular embodiments, the principles involved are susceptible for use in numerous other embodiments that will be apparent to persons skilled in the art. This invention is, therefore, to be limited only as indicated by the scope of the appended claims.
