Circumferentially slotted tubular piezoelectric transformer
阅读：136发布：2022-07-20
专利汇可以提供Circumferentially slotted tubular piezoelectric transformer专利检索，专利查询，专利分析的服务。并且The output power limitations of a piezoelectric transformer operating in the hoop mode of vibration caused by dimensional ratio restrictions are overcome by forming the transformer out of a cylinder of piezoelectric material and cutting a plurality of circumferential slots into the cylinder to form a plurality of interconnected ring transformers, each having an optimal axial dimension.，下面是Circumferentially slotted tubular piezoelectric transformer专利的具体信息内容。
2. The combination according to claim 1 wherein the axial dimension of the annular member from an outer edge thereof to the slot is at least as great as the radial thickness thereof.
3. The combination according to claim 1 wherein the first and second electrodes extend around said hoop-shaped annular member at least one-half the circumference thereof.
4. The combination according to claim 1 wherein the material of the annular member is a piezoelectric material.
5. The combination according to claim 1 wherein the first electrode extends along the inner surface of the annular member and the second electrode extends along the outer surface of the annular member.
6. The combination according to claim 5 wherein the two separate sections are interconnected by a bridge of material at the end of said slot and wherein the first and second electrodes overlie both of the separate sections and are interconnected across the bridge.
7. The combination according to claim 5 wherein first and second conductors are connected to the first and second electrodes, respectively, for applying an input voltage across the first and second electrodes to strain the annular member at the radial dimension thereof, the annular member being vibrated in the hoop mode due to Poisson coupling.
8. A piezoelectric transformer device including in combination: a piezoelectric annular member responsive to the stress of an electric field thereon to produce an electric potential, the annular member being formed in the shape of a closed hoop having a mean diameter to establish hoop mode vibration therein at a given frequency, the annular member having at least one slot formed therethrough and extending around a major portion of the circumference thereof to form at least first and second sections of the annular member, the sections each having a cross-sectional configuration such that the axial dimension thereof exceeds the radial thickness thereof, first and second electrodes positioned opposite one another respectively on part of the inside and outside surfaces of the sections, with the electrodes overlying each of the sections being interconnected to form common first and second electrodes; a further electrode positioned on the annular member diametrically opposite the first and second electrodes to define driven portions of the member between the further electrode and the first and second electrodes, the driven portions of the member being direct current polarized along the circumference thereof, the axial dimension and radial thickness of each of the sections of the annular member providing substantially uniform mechanical stress throughout the body thereof, whereby hoop mode vibration of the sections of said member produces a transformed output voltage at the further electrode with minimized input and output impedances.
9. The combination according to claim 8 wherein each of the sections of the annular member has a generally rectangular cross-sectional shape of which the axial dimension is at least as great as the radial dimeNsion.
10. The combination according to claim 9 wherein the first and second electrodes extend around the sections at least one-half the circumference thereof and wherein the further electrode is positioned on the annular member symmetrically with respect to the first and second electrodes.
11. A transformer device including in combination: a cylindrical member formed of a material responsive to the stress of an electric field thereon to produce an electric potential, the cylindrical member having a plurality of circumferential slots extending therethrough and extending around a major portion of the circumference of the cylindrical member to produce a plurality of annular members joined together by bridging material at the end of each of the slots each of the annular members thereby being formed in the shape of a closed hoop and having a mean diameter to establish hoop mode vibration therein at a given frequency, each of the annular members having a cross-sectional configuration such that the axial dimension thereof is at least as great as the radial thickness thereof; first and second electrodes positioned on opposite sides of arcuate portions of the annular members and bridging the annular members to form therebetween driving regions on each of the annular members of the transformer, the driving regions being direct current polarized between the first and second electrodes; and a further electrode positioned on the annular members diametrically opposite the first and second electrodes and bridging the annular members to form similar driven regions of each of the annular members between the further electrode and the first and second electrodes, the driven regions of the members being direct current polarized along the circumference thereof, the axial dimension and radial thickness of each of the closed hoops formed by the annular members providing substantially uniform mechanical stress throughout the body thereof, and the output step-up voltage of the transformer being proportional to the number of annular members, whereby hoop mode vibration of the annular members produces a transformed output voltage at the further electrode with minimized input and output impedances.
12. The combination according to claim 11 wherein said slots are longitudinally offset from one another so that the bridging material at the end of the slots is offset from slot to slot longitudinally along the cylindrical member to minimize parasitic longitudinal vibrations.
13. The combination according to claim 11 wherein the cylindrical member is formed from piezoelectric material.
14. The combination according to claim 11 wherein each of said slots defining the annular members is formed of at least two parts lying in the same plane, with bridging material separating each end of the parts to form a rigid support for interconnecting each of the annular sections formed out of the cylindrical member.
15. The combination according to claim 14 wherein the slots are offset, so that the bridging material in adjacent slots is longitudinally offset along the surface of the cylindrical member.
16. The combination according to claim 11 wherein the first and second electrodes extend around the annular members at least one-half the circumference thereof.
17. The combination according to claim 16 wherein the first electrode extends along the inner surface of the annular members and the second electrode extends along the outer surface of the annular members.
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