Vibratory structure, method for controlling natural frequency th

Details Vibratory structure, method for controlling natural frequency th Vibratory structure, method for controlling natural frequency th

1996-10-23

1998-07-14

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 20, 310 36, 310 37, 310 80, 310309, 310316, 310328, H02K 0706

Patent

active

057809488

ABSTRACT:
A vibratory structure and a method for controlling the natural frequency thereof are provided. The vibratory structure has an elastic member one end portion of which is fixed to a first support end, an inertial object for vibrating by the elastic force of the elastic member, a moving electrode attached integrally to the inertial object, an effective stiffness controlling electrode fixed to a second support end, and a power supplier for generating electric force between the moving electrode and the effective stiffness controlling electrode. The moving electrode and the effective stiffness controlling electrode are formed into a predetermined shape, so that the electric force varies linearly according to the displacement of the inertial object. Thus, the natural frequency of the vibratory structure is controlled by changing the voltage applied across the moving electrode and the effective stiffness controlling electrode.

REFERENCES:
patent: 4218631 (1980-08-01), Yamaguchi
patent: 4710656 (1987-12-01), Studer
patent: 4816707 (1989-03-01), Vanderlaan
patent: 5026341 (1991-06-01), Giebeler
patent: 5118086 (1992-06-01), Stevenson et al.
patent: 5235240 (1993-08-01), Morita et al.
patent: 5497861 (1996-03-01), Brotz

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