Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-12-11
2007-12-11
San Martin, J. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S323040
Reexamination Certificate
active
11477306
ABSTRACT:
A rotary ultrasonic piezoelectric motor is provided and a method of exciting a flexure traveling wave to drive the motor. The motor includes a stator having a piezoelectric ceramic disc polarized in the radial direction and bounded by a top electrode and a segmented bottom electrode. The motor also includes a power source for applying two pairs of alternating voltages to the bottom electrode segments to excite a shear-shear mode vibration in the stator, resulting in a shear-shear mode flexure traveling wave in the stator. The motor further includes a rotor operatively connected to the stator, and the stator is driven to rotate through a frictional force between the rotor and the stator due to the traveling wave deformation of the stator. A linear ultrasonic piezoelectric motor and method of exciting a flexure traveling wave to linearly drive the motor is provided. The motor includes a stator having a rectangular piezoelectric ceramic plate that is polarized in the longitudinal direction. The motor also includes a power source for applying two pairs of alternating voltages to the bottom electrode segments to excite a shear-shear mode vibration in the stator, resulting in a shear-shear mode flexure traveling wave in the stator. The motor further includes a slider operatively connected to the stator, and the stator is driven to move linearly through a frictional force between the slider and the stator due to the traveling wave deformation of the stator.
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Shuxiang Dong*, H. W. Kim, M. T. Strauss #, K. Uchino and D. Viehland, “A Piezoelectric Shear-Shear Mode Ultrasonic Motor”, ICAT/Materials Research Institute, The Pennsylvania State University, University Park, PA 16801 USA, Apr. 2004; *Materials Science & Engineering, Virginia Tech, Blacksburg, VA 24061, USA; #HME, 56 Federal Street, Newbury port, MA 01950, USA.
Dong Shuxiang
Strauss Michael T.
Uchino Kenji
Gifford Krass Sprinkle Anderson & Citkowski P.C.
Martin J. San
The Penn State Research Foundation
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