The connection diagram is illustrated below.Īfter connection, the module is calibrated so that a full-range extension of the actuator produces a +10V sensor output. The PDu150CL driver module (version 5 or above) provides all of the required functions for open- or closed-loop operation. For example, the closed-loop resolution of the SCL050509 and PDu150CL amplifier module is approximately 25nm (peak-to-peak) with a 100-Hz bandwidth. That is, the 6σ-resolution is 0.26% of full scale for a 100-Hz bandwidth. Therefore, the predicted standard deviation of the strain measurement noise is The PDu150CL amplifier module has an input referred noise of 3 uVrms from 0.1 Hz to 100 Hz. For a full-scale strain of 0.1%, the expected bridge voltage is 6.7 mV. 2), ε is the strain, and ν is the Poisson’s ratio (0.34 for PZT5H). The induced differential voltage V S for a two-varying element full bridge is This convention is adopted since a positive strain +ε causes a negative resistance change in the 90 degree element due to Poisson’s ratio (ν). The strain elements aligned with the direction of the piezo expansion are labelled +ε and the 90 degree elements are denoted –νε. The strain gauge is a 350-Ohm full-bridge arrangement constructed from two 90 degree rosettes. The maximum recommended preload is 50% of the blocking force. This guarantees that the actuator is always in compression. In applications that require bi-directional forces or high-speed motion, a preload force is recommended with a magnitude greater than the maximum tensile load. The maximum recommended tensile load is 10% of the blocking force. In applications where heat dissipation or operation at elevated temperature is required, Loctite 9466 is recommended. superglue gel, and general-purpose two-part epoxies, e.g. Suitable adhesives for low temperature operation include cyanoacrylate, e.g. Flexural mechanisms are also recommended. To reduce mounting errors, a ceramic or stainless steel ball end can be used to interface the stack actuator to the load. Stack actuators should not be exposed to significant tensile loads, unequally distributed loads, off-axis loads, bending moments, or torque. Applications include: Nanopositioning, Microscopy, Precision Machining, Vibration Control, Hydraulic Pumps, Valves, and Optics. The SCL actuators are ideally matched to the PDu150CL driver that can be pre-calibrated to an actuator when ordered together. The stack actuator is ceramic encapsulated for humidity protection and epoxy coated to insulate the high-voltage wiring and provide mechanical protection. The SCL family of stack actuators include a full-bridge strain sensor for closed-loop control and strain monitoring. Alternatively, a 0.4mm ceramic spacer can be added to both ends by appending the order code with -Spacer, e.g. To avoid short-circuit of the strain gauge, ball ends are recommended. An example of an 18mm length actuator is pictured in Section 4. * The strain gauge electrical contacts on the 18mm actuators are close to the end of the stack and may contact the mounting surface. SCL Series Closed-Loop Stack Actuators General Specifications: Drive Voltage SCL Series Closed Loop Stack Actuators 150V Piezoelectric Stack Actuators with Strain Gage for closed loop operation (MMech) Your development partner in electro-mechanical systems This allows the freedom to mount the sensor plates at any convenient point on the host fixture.Micromechatronics, Inc. This provides capacitive position sensing for sub-nanometre precision with the benefit of independent sensor placement from the actuator. If a small form factor and closed loop performance is required the MTP can be used in conjunction with a Queensgate’s position measurement system. However, if required, it is possible to achieve additional range by using a -30V to 150VDC capable HV amplifier. Driving the MTP actuator over nominal range simply requires a 0V to 120VDC HV amplifier. This characteristic enables the actuator to drive demanding loads of up to a maximum 10kg (MTP-15) in the Z-axis. The actuators offer a very stiff design that is capable of generating blocking forces as high as 1000N (MTP-15). The MTP is an internally preloaded piezoelectric open loop translation device capable of moving up to 105μm with very high resolution.
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