Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

Filed on

1989-03-13

Date issued

1990-06-12

Examiner

Budd, Mark O.

Patent Class

Electrical generator or motor structure

SubClass

Non-dynamoelectric

SubSubClass

Piezoelectric elements and devices

Other Related Categories

310328, H01L 4108

Type

Patent

Status

active

Patent number

049335901

Description

ABSTRACT:
This invention provides an ultrasonic motor using a bolt-tightened Langevin type torsional vibrator as a stator. The stator produces a vibrational energy to be converted into a rotational energy for a rotor contacted with the stator. The rotor is provided between a piezoelectric actuator and the torsional vibrator so that the contact state between the rotor and the torsional vibrator is controlled either one of loose contact and tight contact therebetween. According to the present invention, since the piezoelectric actuator is slidingly combined to the rotor, the rotation energy is not applied to the piezoelectric actuator and thus the life time of the actuator becomes long.

REFERENCES:
patent: 4210837 (1980-07-01), Vasilieu et al.
patent: 4663556 (1987-05-01), Kumada
patent: 4681667 (1987-07-01), Utsumi et al.
patent: 4705980 (1987-11-01), Mishiro
patent: 4728843 (1988-03-01), Mishiro
patent: 4764702 (1988-08-01), Mishiro
patent: 4812697 (1989-03-01), Mishiro
"A Piezoelectric Ultrasonic Motor", Kumada, Japanese Journel of Applied Physics, vol. 24, Supplement 24-2, pp. 739-741 (1985).

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