Actuator

摘要

An exemplary actuator in the form of a plate is disclosed, which includes, at least two generators for exciting an acoustic standing wave in the actuator. The actuator can have at least two main surfaces and a plane of symmetry S running perpendicularly to the main surfaces, with respect to which the generators are arranged symmetrically. A first lateral surface area can have a length L that substantially corresponds to the wavelength of the acoustic standing wave excited in the actuator. A second lateral surface area of the actuator can have a length (B) that is greater than the wavelength of the acoustic standing wave excited in the actuator, and that is not equal to a multiple of half the wavelength of the excited acoustic standing wave.

主权项

1. Actuator in the form of a plate, comprising:
at least two generators for exciting an acoustic standing wave in the actuator, wherein the actuator has at least two main surfaces and a plane of symmetry S running perpendicularly to the main surfaces, with respect to which plane of symmetry S the generators are arranged symmetrically; arranged on a first substantially flat lateral surface area of the actuator, at least one friction element and/or at least one friction layer which are provided for friction contact with an element to be driven, and wherein the first lateral surface area has a length L that substantially corresponds to the wavelength of the acoustic standing wave excited in the actuator; a second lateral surface area of the actuator having a length B that is greater than a wavelength of the acoustic standing wave excited in the actuator and that is not equal to a multiple of half the wavelength of the excited acoustic standing wave; and an element to be driven and an electrical excitation device, wherein the electrical excitation device is configured to provide a periodic asymmetrical electrical voltage, wherein the generators are connected to each other with inverse phases.