The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 2006
Filed:
Jun. 08, 2004
David J. Erickson, Liverpool, NY (US);
David J. Erickson, Liverpool, NY (US);
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
An efficient generator of electrical power employs groups of piezoelectric devices disposed in a radial manner about a centrally located cam. The cam, when rotated by a prime mover as a conventional source of mechanical energy, applies a periodic varying force to each piezoelectric device in a suitable sequence. The devices operate to respond to the rotation of the cam by having a cam follower coupled to each device via a spring, whereby a periodically varying force is applied to each piezoelectric device according to the cam surface and based on the rotation of the cam. Each device produces an output voltage according to the force applied to the device via the cam and the coupling between the device and the cam surface. Each device includes a stack of low loss piezoelectric plates connected together and responsive to the application of a mechanical stress to the stack to produce an electrical output.