PIEZOELECTRIC MOTOR AND METHOD OF EXCITING AN ULTRASONIC TRAVELING WAVE TO DRIVE THE MOTOR

Title:

PIEZOELECTRIC MOTOR AND METHOD OF EXCITING AN ULTRASONIC TRAVELING WAVE TO DRIVE THE MOTOR

Document Type and Number:

WIPO Patent Application WO2004107554

Kind Code:

A3

Abstract:

A rotary ultrasonic piezoelectric motor (10) is provided and a method of exciting a flexure traveling wave to drive the motor. The motor includes a stator (12) having a piezoelectric ceramic disc (16) polarized in the radial direction and bounded by a top electrode (20) and a segmented bottom (22) electrode. The motor also includes a power source (26) 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 (42) 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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Inventors:

UCHINO KENJI (US)
DONG SHUXIANG (US)
STRAUSS MICHAEL T (US)

Application Number:

PCT/US2004/016688

Publication Date:

May 04, 2006

Filing Date:

May 27, 2004

Export Citation:

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Assignee:

PENN STATE RES FOUND (US)
UCHINO KENJI (US)
DONG SHUXIANG (US)
STRAUSS MICHAEL T (US)

International Classes:

H01L41/08; H01L41/09; H02N2/00; H02N2/16

Foreign References:

US4912351A	1990-03-27
US4945275A	1990-07-31

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