Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1996-02-26
1998-07-21
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, H01L 4110, H02H 104
Patent
active
057838984
ABSTRACT:
A mechanical vibration control device includes a piezoelectric material having a pair of electrical leads extending therefrom, and a shunt circuit connected across the electrical leads of the piezoelectric material. The shunt circuit includes an energy dissipation circuit element having a dissipation element resistor, and a frequency tuning element inductor connected in parallel with the dissipation element resistor. To reduce and damp multiple vibrational modes, multiple shunt circuits are added in parallel. The various shunt circuits are isolated from each other with an isolator circuit element connected in series with each energy dissipation circuit element. The isolator circuit element includes an isolator element capacitor, and an isolator element inductor connected in parallel with the isolator element capacitor.
REFERENCES:
patent: 3881137 (1975-04-01), Thanawala
patent: 4122725 (1978-10-01), Thompson
patent: 4987564 (1991-01-01), Yokoyama
patent: 5262677 (1993-11-01), Ramirez
patent: 5337090 (1994-08-01), Ogino et al.
Dougherty Thomas M.
McDonnell Douglas Corporation
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