Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1998-11-18

2000-01-25

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

06018213&

ABSTRACT:
An ultrasonic motor having a stator for generating a vibration therein and a rotor rotatably disposed on the stator is designed so that an electric power for driving the motor is efficiently converted to a rotational force. The rotor is designed so that its resonant frequency becomes equal to a resonant frequency of the stator. Therefore, the resonant vibration in the stator having a peak amplitude is efficiently transferred to the stator which has the same resonant frequency. A plurality of slanted slits for converting a longitudinal vibration into a twisting vibration may be provided on the stator or both of the stator and the rotor. The slanted slits further enhance efficiency of the ultrasonic motor and may be used to selectively rotate the rotor in two directions.

REFERENCES:
patent: 4663556 (1987-05-01), Kumada
patent: 5051647 (1991-09-01), Uchikawa
patent: 5376858 (1994-12-01), Imabayashi et al.
patent: 5448128 (1995-09-01), Endo et al.
patent: 5763981 (1998-06-01), Okazaki et al.

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