Rotary ultrasonic motor

Details Rotary ultrasonic motor Rotary ultrasonic motor

1986-11-14

1987-09-29

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310325, 310328, H01L 4108

Patent

active

046971173

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.

REFERENCES:
patent: 4210837 (1980-07-01), Vasiliev et al.
patent: 4580073 (1986-04-01), Okumura et al.
patent: 4620121 (1986-10-01), Mishiro
patent: 4642509 (1987-02-01), Kumada

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