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US 5,616,980 AGranted
Ceramic motor
AssigneeNanomotion Ltd.
InventorJona Zumeris
Life of this patent
Estimating the term…
Abstract
A micromotor for moving a body including at least one rectangular piezoelectric plate having long and short edges and first and second faces, electrodes attached to the first and second faces and a ceramic spacer attached to the center of a first one of the edges and operative to be pressed against the body. A resilient force is applied to the center of a second edge opposite the first edge, whereby the ceramic spacer is pressed against the body. At least some of the electrodes are electrified by either an AC or an asymmetric unipolar pulsed voltage.
Claims16
A micromotor for moving a body comprising:
- a piezoelectric plate having:
- first and second faces, wherein at least a portion of said first face is divided into four quadrants;
- long and short edges;
- four electrodes attached to said first face, one electrode attached to each quadrant of said first face;
- and
- mounting holes formed in said piezoelectric plate, spaced along an axis which is parallel to said long edges and is situated in the space between adjacent electrodes attached to said first face.
3 more elements
A micromotor for moving a body comprising:
- a rectangular piezoelectric plate having:
- first and second faces, wherein at least a portion of said first face is divided into four quadrants;
- two long and two short edges;
- a spacer attached to a first short edge;
- four electrodes attached to said first face, one electrode attached to each quadrant of said first face;
- an electrical power supply which electrifies at least two electrodes on said first face;
- and
- wherein a first pair of diagonally situated electrodes are electrified with an AC voltage and a second pair of diagonally situated electrodes are electrically grounded.
5 more elements
A micromotor comprising:
- a rectangular piezoelectric plate having:
- first and second faces, wherein at least a portion of said first face is divided into four quadrants;
- two long and two short edges;
- four electrodes attached to said first face, one electrode attached to each quadrant of said first face;
- an electrical power supply which electrifies at least two electrodes on said first face;
- and
- wherein a first pair of diagonally situated electrodes are electrified with a unipolar voltage and a second pair of diagonally situated electrodes are electrically grounded.
4 more elements
A micromotor comprising:
- a rectangular piezoelectric plate having:
- first and second faces, wherein at least a portion of said first face is divided into four quadrants;
- two long and two short edges;
- four electrodes attached to said first face, one electrode attached to each quadrant of said first face;
- an electrical power supply which electrifies at least two electrodes on said first face;
- and
- wherein a first pair of diagonally situated electrodes are electrified with a unipolar voltage and a second pair of diagonally situated electrodes are electrically floating.
4 more elements
A micromotor comprising:
- a rectangular piezoelectric plate having:
- first and second faces, wherein at least a portion of said first face is divided into four quadrants;
- two long and two short edges;
- four electrodes attached to said first face, one electrode attached to each quadrant of said first face;
- an electrical power supply which electrifies at least two electrodes on said first face;
- and
- wherein electrodes along a first long edge are electrified with a unipolar voltage of a first polarity.
4 more elements
A micromotor comprising:
- a rectangular piezoelectric plate having:
- first and second faces, wherein at least a portion of said first face is divided into four quadrants;
- two long and two short edges;
- four electrodes attached to said first face, one electrode attached to each quadrant of said first face;
- an electrical power supply which electrifies at least two electrodes on said first face;
- and
- wherein electrodes lying a long edge are electrified with unipolar voltages of opposite polarities.
4 more elements
A micromotor comprising:
- a rectangular piezoelectric plate having:
- first and second faces, wherein at least a portion of said first face is divided into four quadrants;
- two long and two short edges;
- four electrodes attached to said first face, one electrode attached to each quadrant of said first face;
- an electrical power supply which electrifies at least two electrodes on said first face;
- and
- wherein at least one of said electrodes is electrified with a unipolar voltage.
4 more elements
A micromotor for moving a body comprising:
- a first rectangular piezoelectric plate and a second rectangular piezoelectric plate, each plate having:
- long and short edges and first and second faces, wherein said first face of said first plate is parallel to said first face of said second plate;
- electrodes attached to the first and second faces;
- and
- a spacer attached to the center of a first one of the edges;
- means for applying resilient force to the center of a second edge opposite the first edge, whereby the spacer is pressed against the body;
- and
- means for electrifying at least some of the electrodes so that the spacer on the first plate and the spacer on the second plate move out of phase with each other, whereby more continuous motive force is applied to the body by the micromotor.
5 more elements
Dependencies are inferred from the claim text.