Linear Actuator for Automation Applications

PILine ultrasonic piezo drives offer an affordable alternative to electromagnetic linear motors and motor-leadscrew combinations when small dimensions and/or high speed are important. With velocities of up to 200mm/s, these drives are fast, compact and readily integrated. In addition, PIline motors are self-locking at rest with zero heat generation, eliminating the need for an additional motor brake. PI's M-272 is a linear actuator designed for automation applications based on a maintenance-free PILine ultrasonic ceramic motor.

The M-272 closed-loop linear drive combines motor, actuator, linear encoder, guiding system and brake functionality in a very compact package. Due to the integrated guiding system, a payload can be easily attached to the drive rod of the M-272 drive and positioned precisely. The M-272 features a maintenance-free ceramic linear motor, has travel range of 50mm and 5um resolution with integrated linear encoder. It is self-locking at rest, with no need for external brakes and no energy consumption.

PILine piezo motors are based on a new, patented, ultrasonic drive principle developed by PI. The core piece of the system is a piezoceramic plate, excited with high-frequency eigenmode oscillations. A friction tip attached to the plate moves along an inclined linear path at the eigenmode frequency. Through its contact with the ceramic friction bar (runner), the moving part of the mechanical system is pushed along. With each oscillatory cycle, the mechanical system executes a minute step of only a few nanometres and the macroscopic result is smooth motion with a virtually unlimited travel range.

The piezo ceramic plate is preloaded against the runner and thus generates the holding force when the drive is at rest. The technology is in part protected by US Pat. No. 6,765,335 and German Patent No. 10154526. The linear actuator can be driven with the C-867.OE OEM controller card. Its highly specialised DSP handles all of the motion properties typical for ultrasonic piezomotors, such as dynamic control parameter adaption. Optimised settling behaviour of the mechanics within 10s of milliseconds is achieved by automatically switching between gainsets for dynamic and static operation.

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