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1. 发明申请

US20150042209A1 ULTRASONIC ACTUATOR 有权
标题翻译：超声波执行器
公开(公告)号：US20150042209A1
公开(公告)日：2015-02-12
申请号：US14377767
申请日：2013-02-04
申请人： Physik Instrumente GmbH & Co. KG
发明人： Wladimir Wischenwskiy , Alexej Wischenwskiy
IPC分类号： H02N2/04 , H02N2/02
CPC分类号： H02N2/04 , H02N2/007 , H02N2/026 , H02N2/103
摘要： The invention relates to an ultrasonic actuator (2) with a polarization axis P, said actuator being made of a piezoelectric ceramic. The ultrasonic actuator (2) has a temperature expansion coefficient which is parallel to the polarization axis P and which differs from a temperature expansion coefficient that is perpendicular to the polarization axis P, and at least one friction element (8) is arranged on the ultrasonic actuator. The friction element (8) consists of an anisotropic monocrystal with temperature expansion coefficients which are different along the three crystal axes a, b, and c. The temperature expansion coefficient along a first of the three crystal axes is the lowest, and the temperature expansion coefficient along a second of the three crystal axes is the greatest. The friction element (8) is aligned relative to the ultrasonic actuator (2) such that the first crystal axis is parallel to the polarization axis P of the ultrasonic actuator (2), and the second crystal axis is perpendicular to the polarization axis P of the ultrasonic actuator (2). The invention additionally relates to an ultrasonic motor with an ultrasonic actuator of the aforementioned type.
摘要翻译：本发明涉及一种具有偏振轴P的超声波致动器（2），所述致动器由压电陶瓷制成。超声波致动器（2）具有与偏振轴P平行的温度膨胀系数，其与垂直于偏振轴P的温度膨胀系数不同，并且至少一个摩擦元件（8）配置在超声波执行器。摩擦元件（8）由具有三个晶轴a，b和c不同的温度膨胀系数的各向异性单晶构成。沿着三个晶轴的第一个的温度膨胀系数最低，并且沿三个晶轴的第二个的温度膨胀系数最大。所述摩擦元件（8）相对于所述超声波致动器（2）对准，使得所述第一晶轴与所述超声波致动器（2）的偏振轴P平行，所述第二晶轴垂直于所述超声致动器超声波致动器（2）。本发明还涉及具有上述类型的超声波致动器的超声波马达。

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