7 results about "Elliptic motion" patented technology

Various embodiments include a piezoelectric actuator for driving motion of a deformable lens. The piezoelectric actuator may include a frame coupled with piezoelectric elements. According to some embodiments, the piezoelectric elements may be activated to produce relative elliptical motion between portions of the frame. The relative elliptical motion may modulate friction between surfaces of the frame, so as to drive motion of at least a portion of the deformable lens.

The application discloses a cage type dynamic-rotor integrated piezoelectric actuator and a control method thereof. The actuator comprises three parts of a ring-shaped piezoelectric vibrator, a fixed holder and a circular arc slide rail. Two driving feet are symmetrically arranged on the outer side of the ring-shaped piezoelectric vibrator in the diametric direction, and two rotating shafts are arranged in the vertical direction. A plurality of piezoelectric ceramics are symmetrically attached to the grooves on the two sides of the circular ring. The working principle of the application is that two different vibrations are generated by the piezoelectric vibrator, and after coupling, an elliptical motion is output at the driving feet, and the rotation is driven through the reaction force of the friction. The application innovatively designs a stator-rotor integrated piezoelectric rotary actuator. The piezoelectric vibrator is not only a driving power source, but also a motion mechanism, so that the structure and function are integrated, an additional rotor and a fixing device are not needed, the overall structure of the actuator is simplified, and the weight of the actuator is reduced.

The invention discloses a novel underwater robot based on a patch type piezoelectric transducer, and relates to the field of piezoelectric driving. The device comprises a patch type piezoelectric transducer, a clamping structure, a base body, two tension springs, four bearings, a first axle, a second axle, four wheels and two bearing boxes. The patch type piezoelectric transducer is fixed between two vertical plates of the base body through a clamping structure, two wheel shafts of the wheel are clamped in wheel shaft holes of the base body through bearings and limiting gaskets, and two tension springs are hung on bolts on the two sides of the base body and are in a stretching state, so that two plane driving feet at the bottom of the piezoelectric transducer abut against the two wheel shafts. When the robot works, the patch type piezoelectric transducers are excited, the two plane driving feet at the bottoms of the patch type piezoelectric transducers generate elliptical motion in the same direction, the two wheel shafts are driven to rotate through friction, then the wheels are driven to rotate, and movement of the robot is achieved. According to the technical scheme, the problems that an existing underwater robot is large in size, complex in structure and difficult in dynamic sealing in the high-water-pressure environment are solved.

The invention discloses a piezoelectric-driven bionic sea turtle underwater swimming robot and a control method thereof, relates to the field of underwater robots, and solves the problems of poor driving flexibility, high energy consumption and insufficient silence in the prior art. The robot comprises a main body driving assembly and anterior and posterior limb driving assemblies; the main body driving assembly comprises a main body piezoelectric vibrator composed of a main body piezoelectric vibrator base body and four ceramic pieces, the limb driving assembly comprises a limb piezoelectric vibrator composed of a limb piezoelectric vibrator base body and two ceramic pieces and a hydrofoil, and the limb piezoelectric vibrator and the hydrofoil are assembled in a pre-tightening mode through a tension spring. During control, the forelimb and the main body electric vibrator respectively apply two-phase simple harmonic signals with phase difference, and the two-phase simple harmonic signals cooperatively vibrate to generate relative elliptical motion to drive the hydrofoil to backwards push water to obtain propulsive force; then the limb position recovery is realized by the inverted main body piezoelectric vibrator; the robot continuously advances in a reciprocating alternating mode of propelling and recovering; a simple harmonic electric signal is applied to one of the two forelimbs to realize yawing movement of the forelimb. The robot is compact in structure, accurate in movement, low in consumption, mute and high in flexibility.

The application discloses a high-viscosity fluid piezoelectric ultrasonic atomization device, which comprises a piezoelectric ceramic base, the bottom side of the piezoelectric ceramic base is fixedly connected with a piezoelectric ceramic, a variable amplitude plate is eccentrically fixed to the top side of the piezoelectric ceramic base and can amplify high-frequency vibration generated by the piezoelectric ceramic inverse piezoelectric effect, a plurality of pipe grooves are arranged at the end of the variable amplitude plate corresponding to vibration transmission, light holes communicating with the side walls of the pipe grooves are arranged at the two side ends of the variable amplitude plate, clamping limiting pieces are connected to the light holes and used for positioning metal liquid passing pipes in the pipe grooves, based on the eccentric layout of the variable amplitude plate, micro-elliptical motion can be formed at the vibration end of the variable amplitude plate, the high-viscosity fluid in the metal liquid passing pipe can alternately present positive pressure and negative pressure, and then transient cavitation and liquid flow are excited and generated, the application has the advantages of simple structure, convenient use, solution to the problem of effectively atomizing high-viscosity fluid at low cost and suitability for atomization scenes of high-viscosity fluid which cannot be diluted or atomized after being heated.

For a piezoelectric actuator used to linearly drive a driven element by inducing elliptical motion in a vibrating element through vibration of the piezoelectric element, a drive device is provided that improves control at very low speeds and / or enables the use of a smaller boost circuit to provide the drive voltage for the piezoelectric actuator. According to one embodiment, a drive device for axially driving a driven element is provided. The driving device includes: a piezoelectric actuator, wherein the piezoelectric actuator includes a vibrating element in contact with a driven element and one or more sets of piezoelectric elements attached to the vibrating element; and a controller, wherein each set of piezoelectric elements includes one or more piezoelectric elements, and in each set of piezoelectric elements, a first electrode for expanding or contracting a first region of the piezoelectric element in the set of piezoelectric elements and a second electrode for expanding or contracting a second region of the piezoelectric element in the set of piezoelectric elements are arranged along the axial direction, wherein in each set of piezoelectric elements, a common third electrode or a separate third electrode paired with the first electrode and the second electrode is provided, such that the vibrating element of the piezoelectric actuator has: a bending mode, wherein the middle portion along the axial direction becomes convex or concave, thereby causing the ends of the vibrating element to move along the axial direction at both ends; and an expansion / contraction mode, wherein one end expands / contracts at both ends of the axial direction, while the other end expands / contracts with opposite phases over time, thereby causing the ends of the vibrating element to move in a direction perpendicular to the axial direction. The controller is used to cause the vibrating element to vibrate by applying oscillating voltage signals of the same frequency to the first and second electrodes, thereby driving the driven element in contact with the vibrating element along the axial direction. When the oscillating voltage signals applied to the first and second electrodes are in phase, a first mode of vibration based on the bending mode is generated in the vibrating element; when the oscillating voltage signals applied to the first and second electrodes are in opposite phase, a second mode of vibration based on the expansion / contraction mode is generated in the vibrating element, wherein the controller is used to control the speed of the driven element by controlling the phase difference between the voltage signals applied to the first electrode and the voltage signals applied to the second electrode. Another aspect of the invention provides a small boost circuit for providing a drive voltage for a piezoelectric actuator.

The invention discloses a novel underwater robot based on a sandwich type piezoelectric transducer, and relates to the field of piezoelectric driving. The device comprises a sandwich type piezoelectric transducer, a clamping structure, a base body, two tension springs, four bearings, a first axle, a second axle and four wheels. The sandwich type piezoelectric transducer is fixed between two vertical plates of the base body through a clamping structure, two wheel shafts of the wheel are clamped in wheel shaft holes of the base body through bearings and limiting gaskets, and two tension springs are hung on bolts on the two sides of the base body and are in a stretching state, so that two plane driving feet at the bottom of the piezoelectric transducer abut against the two wheel shafts. When the robot works, the sandwich type piezoelectric transducer is excited, the two plane driving feet at the bottom of the sandwich type piezoelectric transducer generate elliptical motion in the same direction, the two wheel shafts are driven to rotate through friction, then the wheels are driven to rotate, and movement of the robot is achieved. According to the technical scheme, the problems that an existing underwater robot is large in size, complex in structure and difficult in dynamic sealing in the high-water-pressure environment are solved.