Stator and piezo ultrasonic motor including the same

Details Stator and piezo ultrasonic motor including the same Stator and piezo ultrasonic motor including the same

2011-05-24

2011-05-24

Rosenau, Derek J (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323040, C310S323060

Reexamination Certificate

active

07948149

ABSTRACT:
A stator and a piezo ultrasonic motor including the same are provided. The piezo ultrasonic motor includes a stator including an elastic body having a flat portion at its outer surface and a central hole penetrating the center of the stator with a predetermined size, and a piezoelectric body including a first internal piezoelectric body and a second internal piezoelectric body integrally disposed parallel to each other in a longitudinal direction of the flat portion and providing an external force deforming the elastic body when an AC voltage is applied, a rotor inserted in the central hole and including a contact frictionally contacting an inner surface of the central hole, an elastic part providing an elastic force maintaining close attachment of the contact to the stator. Accordingly, the manufacturing cost decreases by reducing the number of elements and simplifying a structure, and a stable driving characteristic can be achieved.

REFERENCES:
patent: 2005/0052908 (2005-03-01), Tomoeda et al.
patent: 2007/0029898 (2007-02-01), Lee et al.
patent: 2007/0029900 (2007-02-01), Kang et al.
patent: 2007/0138915 (2007-06-01), Mulvihill et al.
patent: 2008/0238254 (2008-10-01), Zhou et al.
patent: 10-2006-0099261 (2006-09-01), None
Burhanettin Koc et al., “A Piezoelectric Motor Using Two Orthogonal Bending Modes of a Hollow Cylinder”, IEEE Transaction on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 49, No. 4, Apr. 2002, pp. 495-500.

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