Piezo-Based Linear Drive for Automation Technology

PI offers a scalable piezo-based linear drive that has drive forces up to 10N, velocities up to 0.5m/s and travel ranges of several tens of 10mm, for rectilinear motions in automation technology. A piezo-ceramic actuator oscillating with ultrasonic frequencies is preloaded against a rod with linear guidance. The oscillation profile of the actuator then produces the forward and backward motion of the drive. The ceramic is preloaded against the rod and thus keeps it in its 'at rest' position when powered down.

Unlike electromagnetic linear motors, the piezo-based drive does not require any energy for this, no heat is dissipated and the position is maintained with a high degree of stability. During positioning operations, the piezo-based linear drive with optical linear encoder achieves an accuracy of around 10um. In contrast with electromagnetic linear drives, the piezo-ceramic actuator does not generate any interfering magnetic fields when in operation. The piezo-based linear drive has a matching controller with pre-integrated driver electronics to generate the ultrasonic oscillations - both controller and linear drive are designed for industrial applications.

The controller has a 100mm-wide, 160mm-long eurocard that can be controlled via an RS232 interface, CAN or an analogue input, as desired, for velocity control or external operation via joystick, for example. The 32-pole multipoint connector can easily be connected up by means of adapter modules or screw terminals when the control cabinet is being installed.

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