Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1994-09-29

1996-07-02

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, H01L 4108

Patent

active

055325416

ABSTRACT:
An ultrasonic motor has a plurality of Langevin vibrators arranged in a ring, and the Langevin vibrators vibrate when an alternating voltage is provided thereto. Each of the Langevin vibrators has a first polarized region and a second polarized region which are polarized in mutually opposite directions. When the Langevin vibrators are supplied with an alternating voltage so as to vibrate in the length mode and flexural mode at substantially the same frequency, the edges of the metal terminals move in a elliptical motion, which drives the rotor.

REFERENCES:
patent: 4645964 (1987-02-01), Hiramatsu et al.
patent: 5231325 (1993-07-01), Tamai et al.
patent: 5410204 (1995-04-01), Imabayashi et al.

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