Rotary ultrasonic motor
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United States of America Patent
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-
Sep 29, 1987
Grant Date -
N/A
app pub date -
Nov 14, 1986
filing date -
Nov 27, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary ultrasonic motor equipped with an ultrasonic vibrator including an electrostrictive element which is polarized in the direction of its thickness and has a plurality of electrode pairs arrayed uniformly in the circumferential direction. The electrostrictive element is held and clamped between two metallic members, and grooves are formed in at least one metallic member along division lines corresponding in number to the electrode pairs of the electrostrictive element, thereby constituting the ultrasonic vibrator. And a rotor having an output shaft at the center of rotation thereof is kept in pressed contact with the output end of the ultrasonic vibrator. In this motor, the rotor is driven by composite vibration, and an improved function is achievable to prevent mutual interference that may otherwise be caused by a circumferential stress at the axial vibration of the ultrasonic vibrator.
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