Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-10-27
1995-08-08
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H02N 200
Patent
active
054401917
ABSTRACT:
An ultrasonic motor is proposed for which the process of manufacture is easy and the yield and production cost are improved, in spite of the fact that the width of the contact between a moving member and a stator is less than the width of a base portion of the moving member.
This ultrasonic motor includes a stator in which traveling waves are excited by a piezoelectric element, and a moving member which is in pressure contact with the stator and which is driven by the traveling waves in the stator. The moving member includes a base portion and a slider portion which is provided on the side of the base portion facing the stator and which is formed with a contact surface against the stator. The contact surface is so formed that the width in the direction perpendicular to the direction of propagation of the traveling waves of the contact between the contact surface and the stator is substantially less than the width in that direction of the moving member base portion. The base portion and the slider portion of the moving member are formed as a unitary body from the same material, and preferably are formed as a unitary body from a composite resin material which includes potassium titanate whiskers.
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Dougherty Thomas M.
Nikon Corporation
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