Ultrasonic motor having generators formed of cooperating and spaced apart first and second sub-generators
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United States of America Patent
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Sep 7, 2021
Grant Date -
Sep 5, 2019
app pub date -
Feb 28, 2019
filing date -
Mar 5, 2018
priority date (Note) -
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Abstract
An ultrasonic motor and method are disclosed with an element to be driven and a plate-shaped ultrasonic actuator made of polarized electromechanical material with at least two friction elements arranged on one of its side. The ultrasonic actuator can include at least two generators for acoustic standing waves and each of the generators can include two cooperating and spaced sub-generators, and one respective sub-generator of a generator is located between the sub-generators of an adjacent generator, and the sub-generators of one generator are arranged in mirror image to the sub-generators of an adjacent generator. A polarization direction of the electromechanical material of one of the two sub-generators of one generator differs from the polarization direction of the electromechanical material of the other sub-generator of the same generator.
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