Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1998-03-19

1999-09-21

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

31032305, H02N 200

Patent

active

059558202

ABSTRACT:
An improved motor employs a stator which includes a piezoelectric wafer that is poled across its thickness dimension so that a signal applied thereacross results in either an inward or outward movement of the periphery of the wafer. A pair of end caps are placed on opposed surfaces of the wafer and are adhered thereto at their respective peripheries. Each end cap includes a centrally located driving segment, a series of peripheral segments adhered to periphery of the wafer and a plurality of arms connecting the peripheral segments to the driving segment. A rotor includes a driven portion which mates with the driving segment and is driven thereby. Application of a signal across the thickness of the piezoelectric wafer results in rotary motion being imparted to the driving segment via flexure of the arms (as a result of movement of the peripheral segments of the end caps). Further embodiments provide both rotary and linear motions.

REFERENCES:
patent: 4999819 (1991-03-01), Newnham et al.
patent: 5254899 (1993-10-01), Suzuki et al.
patent: 5276657 (1994-01-01), Newnham et al.
patent: 5296776 (1994-03-01), Wind et al.
patent: 5418417 (1995-05-01), Luthier et al.
patent: 5446331 (1995-08-01), Watanabe et al.
patent: 5473215 (1995-12-01), Luthier
patent: 5854528 (1998-12-01), Nidhikura et al.

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