Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1990-05-15

1991-07-02

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

050288334

ABSTRACT:
An ultrasonic motor, comprises an annular stator including an elastic member and piezo-electric elements secured to said elastic member which generate a travelling wave on the surface of the elastic member by being applied with high frequency voltages; and a rotor which is in pressure-contact with the elastic member and is driven to be rotated with respect to said stator by the travelling wave. The rotor includes a cylindrical main body and a thin radial flange integrally secured to the periphery of the rotor main body at one end of the main body facing the stator, and a cylindrical vibration portion secured to a periphery of the flange having a diameter different from that of the rotor main body. The vibration portion extends in a direction which is the same as the vibration direction of the travelling wave. The rotor satisfies the following relation 5<(h/t)<15 wherein t designates the thickness of the flange in a direction of rotational axis and h designates the height of the vibration portion in a direction of vibration of the travelling wave.

REFERENCES:
patent: 4692650 (1987-09-01), Okumura et al.
patent: 4692651 (1987-09-01), Hiramatsu et al.
patent: 4743791 (1988-05-01), Kawai
patent: 4771203 (1988-09-01), Mukohjima et al.
patent: 4793689 (1988-12-01), Aoyagi et al.

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