CRYO LINEAR ACTUATOR “PIEZOKNOB” (CLA##01)

Linear motor for cryogenic applications with nanometer resolution

CONFIGURATION

FEATURES

nm position resolution
20 mK to 375K, vacuum compatible
Internal sliding contacts (static electrical wires)
For use in <5T magnetic fields
Self-locking, holding force of several 100 N
No power dissipation when “off”
Sub-nanometer stability
High stiffness
Cryo Optical Encoder option “COE”

DESCRIPTION

The Cryo Linear Actuator (CLA) or “PiezoKnob” is developed for positioning in a cryo-vacuum environment. Internal piezo ceramics generate a torque pulse which causes the spindle to rotate relative to the stationary nut yielding linear motion. A coating is applied on the spindle for good tribological behavior without any kind of lubrication. The result is an actuator ideally suited for set and forget applications with positioning capabilities in the nm range and driving forces up to 40 N. The system is self-locking and a holding force of several 100 N is possible.

SPECIFICATIONS
specsunitCLA2201CLA2201-COECLA2601CLA2601-COE
ACTUATOR SPECIFICATIONS-
Active axes-1
Type of motion-x
Rangemm126126
Step size @ 293Knm5-25
Step size @ 4Knm1-5
Max. velocity @ 293Kµm/s15
Max. velocity @ 4Kµm/s3
Axial stiffnessN/m8e7
Min. required preloadN3
Max. driving forceN25254040
Operating frequencyHz1-600
Operating voltageV-20 ... +130
Operating temperatureK0.02 - 375
Main construction material-Stainless steel, titanium, phosphor bronze, ceramic
Massgrams30404555
Spindle pitchmm/turn0.25
Dissipation @ 293KmJ/step0.59
Dissipation @ 4KmJ/step0.055
Encoder resolution*PPRN/A710N/A850
DRIVE ELECTRONICS
Controller/driver-CAB-230(115), CADM(2), MCM
Encoder readout-N/AOEM2N/AOEM2
* Linear resolution can be found by dividing the spindle pitch by PPR (pulses per revolution)
WORKING PRINCIPLE

DOWNLOADS

CLA1801 IN ACTION

WORKING PRINCIPLE

Step 1
The objective is to reposition the moving mass from p0 to p2. In the initial condition a steady-state voltage is applied to the piezo and a normal force F is applied to the moving mass to generate friction.
Step 2
Slowly decreasing the voltage shortens the piezo and the inertial mass is ‘pulled’ to position x1 . The moving mass remains on its initial position (p1 = p0) due to the friction.
Step 3
Now, the voltage is rapidly increased to expand the Piezo to its original length. This rapid expansion accelerates the inertial mass and the resulting force on the moving mass overcomes the friction, causing a shift to position p2. Because the inertial mass is larger (more inertia) it will move less backwards than the moving mass shifts forward. After this step the system is in steady state again, at position p2, ready for the next step.

Ordering Information

CLA2201 Cryo Linear Actuator size 22
CLA2201-COE CLA2201 incl. Cryo Optical Encoder
CLA2601 Cryo Linear Actuator size 26
CLA2601-COE CLA2601 incl.Cryo Optical Encoder

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