Ultrasonic motor and laser beam welding apparatus using the same

Details Ultrasonic motor and laser beam welding apparatus using the same Ultrasonic motor and laser beam welding apparatus using the same

1991-09-04

1993-06-08

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310128, 21912163, H01L 4108

Patent

active

052182584

ABSTRACT:
A small-sized ultrasonic motor can produce a high torque and a stable turning force. The ultrasonic motor has: a cylindrical casing, a hollow output shaft extending coaxially through the cylindrical casing supported rotatably by the casing a ring-like stator fixedly mounted on the inner surface of the cylindrical casing having piezoelectric elements fixed on the back surface thereof, a ring-like rotor mounted on the hollow output shaft and facing the front surface of the stator, and springs for pushing the rotor toward the stator. Also disclosed is a laser beam welding apparatus for welding the inner circumferential surface of a tube by using the ultrasonic motor.

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patent: 5041132 (1991-08-01), Miyata
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