Methods and apparatus for power generation
a technology of power generation and power supply, applied in the direction of generator/motor, ammunition fuze, electric fuze, etc., can solve the problem that the power requirement, however, becomes significant, and achieve the effect of increasing the impa
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first embodiment
[0035] In a first embodiment, power generator 100 includes a spring 105, a mass 110, an outer shell 108, a piezoelectric (stacked and washer type) generator 101, one socket head cap screw 104 and a stack of Belleville washers 103 (each of the washers 103 in the stack is shown schematically as a single line). Piezoelectric materials are well known in the art. Furthermore, any configuration of one or more of such materials can be used in the power generator 100. Other fasteners, which may be fixed or removable, may be used and other means for applying a compressive or tensile load on the piezoelectric generator 101 may be used, such as a compression spring. The piezoelectric generator 101 is sandwiched between the outer shell 108 and an end 102 of the spring, and is held in compression by the Belleville washer stack 103 (i.e., preloaded in compression) and the socket head cap screw 104. The mass 109 is attached (e.g., screwed, bonded using adhesives, press fitted, etc.) to another end...
second embodiment
[0040] In a second embodiment, as shown in FIG. 3, the power generator is very similar to that of the previous embodiment, with the difference being that the socket head cap screw 104 (FIG. 1) is eliminated, and the preloading of the piezoelectric element 101 is achieved by means of a pin 116, which is attached to or an integral part of a cap 115. The cap 115 is connected to the housing 118, for example by means of threads, potting, press fitting, flange or other methods known in the art. The cap 115 is in turn attached to the base structure using one of the means described in the previous embodiment. The gap 117, which allows vibration of the mass-spring unit as described for the previous embodiment is provided between the free end 119 of the spring 105 and the cap 115. In addition, the mass 109 is preferably eliminated and a required mass is added to the free end 119 of the spring by making it larger. Alternatively, and if it is allowed by the size of the power generator, the hole...
fourth embodiment
[0043] In a fourth embodiment, as shown in FIG. 5a, the housing shell or support (frame) structure 141 is designed to buckle when the firing acceleration increases beyond a certain predetermined range, thereby helping to provide added protection against damage to the piezoelectric and / or mass-spring and / or other elements of the power generation unit 140. The housing shell or support structure 141 may be designed to be prone to buckling instability in any of the ways known in the art. In FIG. 5a, the buckling instability of the power generator 140 is due to a bowed geometry in its housing shell or support structure 141. At low accelerations and during vibration of the mass-spring unit, the instability will not be noticeable. However, if the acceleration exceeds a critical value, the housing shell (support structure) 141 will become unstable and buckle. The buckling of the housing shell or support structure 141 can be designed to provide protection for the mass-spring unit, piezoelect...
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