Ultrasonic motor and driving for the ultrasonic motor

Details Ultrasonic motor and driving for the ultrasonic motor Ultrasonic motor and driving for the ultrasonic motor

1995-05-08

1997-05-20

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

056315171

ABSTRACT:
An electrostrictive revolution type ultrasonic motor includes a piezoelectric ceramic disk shaped stator and a rotor. The piezoelectric ceramic disk shaped stator has an eccentric movement via excitation by two phase pulse like voltage. The rotor is fitted around the circumference of the stator and is transmitted by a rotating torque due to the eccentric movement via frictional contact therebetween. The rotor is formed of a plastic material by injection molding to achieve a reduction of a size variation of the rotor and a stable contact with the stator. A high and stable rotating torque is thereby obtained with a reduced production cost. Further, a driving device for the ultrasonic motor which varies the frequency of a voltage applied to the ultrasonic motor in a stepped manner discriminates the magnitude of the corresponding motor currents and drives the ultrasonic motor with the frequency which causes the maximum motor current. In this manner, a simple structured and low cost driving device which operates at a high speed and at a high resolution with a high efficiency is achieved.

REFERENCES:
patent: 4833358 (1989-05-01), Suzuki et al.
patent: 4868446 (1989-09-01), Kumada
patent: 4945275 (1990-07-01), Honda
patent: 5332941 (1994-07-01), Honda
Takashi Maeno, et al., "FE Analysis and LDA Measurement of the Dynamic Rotor/Stator Contact in a Ring-Type Ultrasonic Motor", Journal of Tribology, Transactions of ASME, vol. 115, Oct. 1993, pp. 625-631.
Minoru Kurosawa, "Drive and Control Method of Ultrasonic Motor", Kikaisekkei, vol. 36, No. 8, Jul. 1992, pp. 69-76.
Akio Kumada, "Ultrasonic Motors", Journal of Electronics, Information & Communication Association, vol. 72, No. 4, Apr. 1989, pp. 462-468.

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