Piezoelectric transducer for an ultrasonic motor

Details Piezoelectric transducer for an ultrasonic motor Piezoelectric transducer for an ultrasonic motor

1990-03-19

1991-07-16

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

050327542

ABSTRACT:
An ultrasonic motor uses a piezoelectric transducer for effectively transmitting vibration energy and achieving high output. The piezoelectric transducer comprises elastic members, first and second piezoelectric elements, electrodes, and ceramic insulators inserted between the electrodes or between the electrodes and the elastic members. The first and second piezoelectric elements excite the vibration surfaces of the elastic members to vibrate in two modes and to generate approximate elliptical vibration by synthesizing the two vibration modes. The electrodes are provided for applying alternating current signals to the first and the second piezoelectric elements. The first and second piezoelectric elements are polarized such that they cause shear vibration in the same direction. The piezoelectric transducer is fixed in a motor case via a fixing plate. A rotor is provided in such a position as to contact the vibration surface of one of the elastic members.

REFERENCES:
patent: 3218488 (1965-11-01), Jacke
patent: 3390287 (1968-06-01), Sonderegger
patent: 4530138 (1985-07-01), Ritter
patent: 4645964 (1987-02-01), Hiramatsu et al.
patent: 4705980 (1987-11-01), Mishiro
patent: 4764702 (1988-08-01), Mishiro
patent: 4812697 (1989-03-01), Mishiro
patent: 4893045 (1990-01-01), Honda
patent: 4893046 (1990-06-01), Honda

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