8/14/2023 0 Comments Cheap piezo actuator![]() ![]() These actuators can be divided into several types: Physik Instrumente multilayer piezoelectric actuators A relatively unconventional approach is the employment of piezoelectric or simply piezo actuators. This also applies to the actuator system, where classical solutions may or may not meet certain requirements, established as being necessary. Parallel kinematics reduce the mass, inertia, and error stackup of this two-axis stage.In order to build a mechatronic system that can achieve numerous functions and certain performance levels, designers must think outside the box when searching for solutions to be implemented, in almost every aspect, when building an intelligent machine. They also avoid the “stacking” of errors from each axis that occurs with serial kinematic designs. Stages that use parallel kinematics have less moved mass and lower inertia than those designed with serial kinematics. Piezo flexure mechanisms can also be constructed as two- and three-axis stages, with some multi-axis designs using the principle of parallel kinematics, in which multiple axes work together to move a single platform. ![]() And some manufacturers refer to a piezo actuator with mechanical amplification as a piezo motor, so the terms “piezo flexure motor” and “flexure-guided piezo motor” are also used. In this context, the term “ stage” (rather than “actuator” or “motor”) makes sense, since the flexure mechanism provides both motion amplification and guidance, with extremely flat and straight motion. Piezo flexure stages are also referred to as flexure-guided piezo actuators. Flexure stages can also be made from non-magnetic materials, so they can be used in applications where strong magnetic fields are present. The absence of friction also means these stages don’t experience wear or require lubrication, so particulate generation and outgassing are eliminated, making them well-suited for vacuum applications. When voltage is applied to the actuator, a strain is induced in the direction of the actuator’s polarization, causing it to expand in that direction, with the actuator’s displacement being proportional to the amount of voltage applied.īecause they rely on elastic deformation rather than friction-based rolling or sliding motion, piezo flexure stages can produce motions with nanometer-level repeatability and sub-nanometer resolution. A piezo flexure stage combines a piezo stack actuator with flexure guides for longer travel.Ī stacked piezo actuator is one in which multiple piezo elements are layered, or stacked, on top of one another. The piezo actuator and amplifying mechanisms are typically mounted within a fixed frame, which provides preload to the actuator and facilitates mounting for the external load. However, as the amplification ratio increases, stiffness and responsiveness decrease due to the flexure mechanisms - and the addition of lever mechanisms can further reduce stiffness. For even longer strokes, lever mechanisms can also be incorporated, providing a second level of motion amplification. This deformation is elastic, so when the actuator retracts, the linkages move precisely back to their original positions. As the actuator expands, it “pushes” the linkages so they also deform, or flex, to produce additional motion. The amplification provided by a flexure mechanism can extend the stroke of a piezo actuator from several microns to several millimeters.Ī flexure-guided piezo stage incorporates a stacked piezo actuator with mechanical linkages, similar to hinges, that amplify the actuator’s motion and provide guidance for the attached load. To overcome this limited stroke capability, a piezo actuator can be combined with elements, such as flexures, that provide mechanical amplification. ![]() Piezo actuators provide highly responsive, rapid movements, but their displacement is limited to just 0.1 to 0.2 percent of the actuator length. ![]()
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