8/8/2023 0 Comments Buy piezo actuator![]() ![]() Therefore one must be aware of the advantages of piezo actuators to be sure that they are the correct choice for the application compared to conventional motors. Piezo actuator movements will be on the order of a hundred micro meters supporting a load of 7 kN/cm2. Other options for these actuators can be casings specially designed to manage the heat generated during operation, or include the possibility of position sensing for the piezoelectric stack actuator. These stack actuators are often enclosed in metal casing with an appropriate pre stress applied. The device is bonded together with a high quality adhesive. High voltage actuators are constructed with discrete sintered, poled ceramic disks, rings or plates with thin metal leaf electrodes interlaced between the ceramics. The stack is poled by applying a DC field to activate the piezo material and a protective insulating coating is applied. The fired package is cut to size exposing the electrodes and the electrical connections are made. These have very thin ceramic layers that are made by casting a ceramic / organic slurry to form a tape, dried, electroded with a thin precious metal electrode, usually a silver palladium electrode, the electrode tape is stacked, laminated, and fired to a dense ceramic / electrode package. Low voltage actuators are co-fired multilayer actuators. There are low voltage actuators, usually operating at up to 200 volts, and high voltage actuators operating at up to 1000 volts. Multilayer actuators are essentially many stacked layers of piezo material acting in concert. This is the basis for multilayer actuators. A stack of 2 piezo elements will have twice the movement at the same applied voltage as a single piezo element, and a stack of 3 piezo elements will exhibit 3 times the movement as a single element with the same applied voltage, etc. However, the amount of voltage that can be applied will depend on the material and the thickness of each element. Therefore, when one stacks piezo elements together, there is a multiplying effect on the amount of movement that is achieved. Please note that this movement does not depend on the dimensions of the piezo element. This piezoelectric coefficient, d33, is a figure of merit for the piezo material relating to the efficiency of the material in transferring the electrical energy to mechanical energy. The amount of movement that a piezo device can yield is equal to the amount of voltage applied times the d33 or the piezo electric coefficient. The amount of force that can be applied depends on the cross sectional area of the actuator. A piezo actuator will generate a linear displacement when an electric field is applied, and this displacement is also capable of applying a force, and therefore the actuator is capable of doing work. The latter is the inverse piezoelectric response and the response responsible for actuation.Īn actuator is essentially a motor, or a generator of motion, usually linear and limited in range. Piezo materials are materials that will generate an electric charge when they are deformed, or conversely, they will deform when electrically charged. amplifiers, electronic switches, other auxiliary apparatus available.custom design and engineering services available.Basic (planar face) and spherical endpieces available.discrete stack (150 V / 500 V / 1000 V maximum).bare piezo stacks / encased piezo stacks. ![]() large displacements - up to 0.15-0.20% of piezo stack height. ![]()
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