Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1990-04-23

1995-04-18

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

054081564

ABSTRACT:
In an ultrasonic motor having a rotor (6,12) and a vibrating stator (43,49) wherein travelling wave is excited to drive the rotor, the vibrating stator comprises a piezoelectric member (25,26,29,60) and alternately-disposed first segment electrodes and second segment electrodes, the first segment electrodes being connected with each other to form a first intermittent ring or linear electrode train and the second segment electrodes being connected with each other to form a second intermittent ring or linear electrode train, each of the segment electrodes having a length of a quarter of wavelength of the travelling wave in the direction of the travelling wave and being to be polarized in an opposite direction to adjacent electrodes within the same segment electrode.

REFERENCES:
patent: 4484099 (1984-11-01), Kawai et al.
patent: 4504760 (1985-03-01), Yamamoto et al.
patent: 4562374 (1985-12-01), Sashida
patent: 4678956 (1987-07-01), Izukawa et al.
patent: 4692649 (1987-09-01), Izukawa et al.
patent: 4692651 (1987-09-01), Hiramatsu et al.

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