![]() ![]() Refer to our tutorials about quasi-static actuator applications for more information about the behavior of actuators under load.įor bonding, we recommend to use a semi-hard epoxy (Shore D 55-70) with a low viscosity (200-500 cPs). The stiffness of the clamping mechanism in the actuation direction shall be as low as possible, typically under 1/10 th of the stiffness of the actuator, in order not to hinder the movement of the actuator. voltage) during loading/unloading, so it must be connected to a resistor or shorted at all times. When applying a force, be aware that the piezoelectric actuator will generate charge (i.e. For heavily loaded systems, higher pressures are required, typically 20MPa, sometimes up to 40MPa. While unloaded actuators can safely be used in static conditions without preload, for lightly loaded, low dynamic applications we recommend to apply 5MPa clamping pressure. The clamping force must be adapted to the load on the actuator. The substrate must be clean, flat (<10µm depending on dimensions) and smooth (Ra 1.6µm). Stacked actuators are manufactured as a standard with 1mm top and bottom insulating ceramic end-plates which ensure two functions: Electrical insulation and better repartition of the load.įor clamping, most materials can be used, although materials with a high stiffness (steel, titanium) are preferred in order not to affect the overall stiffness of the system, i.e. Having inactive ceramic plates between the actuator and the opposing structure.įor linear actuators, it is recommended not to use a metal plate on top and bottom in order to avoid short circuit.Adding an insulator, for example polyimide tape on any conductive surface near the electrodes.The safe distance depends on the environment and voltage rating and can be in the range 0.1 to 1mm. ![]()
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