AUBURN, Mass., Jan. 17, 2011 — The M-272 fast linear actuator manufactured by PI (Physik Instrumente) L.P. for automation applications is based on a maintenance-free PILine ultrasonic ceramic motor.
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 200 mm/s, the drives are fast, compact and readily integrated. PIline motors are self-locking at rest with zero heat generation, eliminating the need for an additional motor brake and consuming no energy.
The closed-loop linear drive combines motor, actuator, linear encoder, guiding system and brake functionality in a compact package. With the integrated guiding system, a payload can be easily attached to the drive rod of the M-272 drive and positioned precisely.
Features include a maintenance-free ceramic linear motor, a travel range of 50 mm, 5-µm resolution with the integrated linear encoder and an operating speed of 200 mm/s. The high speed and dynamics result in fast settling. OEM driver electronics for ultrasonic motors are available.
PILine piezo motors are based on a new, proprietary and patented ultrasonic drive principle. 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 nanometers; 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 linear actuator can be driven with the C-867.OE OEM controller card. Its highly specialized digital signal processor handles all of the motion properties typical for ultrasonic piezomotors, such as dynamic control parameter adaptation. Optimized settling behavior of the mechanics within 10 s of milliseconds is achieved by automatically switching between gain sets for dynamic and static operation.
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