Ultrasonic motor with a stator and a mobile element made of impr

Details Ultrasonic motor with a stator and a mobile element made of impr Ultrasonic motor with a stator and a mobile element made of impr

1994-12-16

1996-04-16

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

055085814

ABSTRACT:
An ultrasonic motor having a stator and a mobile element made of improved materials. The ultrasonic motor includes an electro-mechanical conversion element, a stator and a mobile element. The electro-mechanical conversion element creates oscillations when an electrical signal is applied to the electro-mechanical conversion element. The stator is joined to the electro-mechanical conversion element and includes a stator contact part. The mobile element includes a mobile element contact part in contact with the stator contact part. When an electrical signal is applied to the electro-mechanical conversion element, the electro-mechanical conversion element creates oscillations in the stator contact part to drive the mobile element. Either the stator contact part and/or the mobile element contact part is made of a plastic material which has a polyacetol resin as a major component. The plastic material can include a polyolefin resin. Moreover, the plastic material can additionally include at least one of titanium oxide, silica, molybdenum disulfide or carbon powder. By properly selecting the material of the stator contact part and/or the mobile element contact part, the drive efficiency, anti-abrasive characteristics and chemical stability of the ultrasonic motor are improved.

REFERENCES:
patent: 4102973 (1978-07-01), Hanning
patent: 4739212 (1988-04-01), Imasaka et al.
patent: 4939404 (1990-07-01), Inagaki et al.
patent: 4963781 (1990-10-01), Sumihara et al.
patent: 5013956 (1991-05-01), Kurozumi et al.
patent: 5059849 (1991-10-01), Sumihara et al.

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