Ultrasonic motor unit

Details Ultrasonic motor unit Ultrasonic motor unit

1993-10-19

1994-08-09

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, H01L 4108

Patent

active

053369580

ABSTRACT:
An ultrasonic motor unit comprises a stator having a piezoelectric member and an elastic member which is excited by the piezoelectric member to generate a travelling vibration wave, and a rotor which is press-contacted to the stator and driven by the travelling vibration wave. At least two sets of input electrodes each having two input electrodes are circumferentially arranged on the piezoelectric member. A drive voltage is applied to only the selected ones of the input electrodes in accordance with a drive power requirement.

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patent: 4998048 (1991-03-01), Furutsu
patent: 5001404 (1991-03-01), Kataoka
patent: 5093606 (1992-03-01), Adachi et al.
patent: 5136215 (1992-08-01), Izukawa
patent: 5237237 (1993-08-01), Ueda et al.
patent: 5247221 (1993-09-01), Atsuta

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