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Features
and Advantages of PILine® Ultrasonic
Piezomotors
- Compact
Size: The direct-drive principle allows the design of
ultra-compact translation stages. The M-662, for example,
provides 20 mm travel in a 28 x 28 x 8 mm package.
- Low
Inertia: High Acceleration, Speed and Resolution:
PILine® drives achieve velocities to 800 mm/s and
accelerations to 20 g. They are also very stiff, a
prerequisite for their fast step-and-settle timeson the
order of a few millisecondsand provide resolution to 0.05
µm. The lack of a leadscrew means no lubricant flow and
material relaxation to cause submicron creep. There is also
no rotational inertia to limit acceleration and
deceleration.
- Excellent Power-to-Weight Ratio:
PILine® drives are optimized for high performance
in a minimum package. No comparable drive can offer the same
combination of acceleration, speed and precision.
Safe: The minimum inertia of the moving
platform together with the slip clutch effect of the
friction drive, provide better protection of precision
fixtures / devices than with leadscrew-driven stages.
Despite the high speeds and accelerations, there is a much
lower risk of pinching fingers or other injuries than with
conventional drives. This means users may not need
interlocks, light curtains or other measures to keep them
safe.
AutoLock Feature: PILine® drives
create a braking force when not energized without causing
the position shift common with conventional mechanical
brakes. Other benefits of the AutoLock feature are the
elimination of servo dither and steady-state heat
dissipation.
Vacuum Compatibility: Vacuum compatible
versions of PILine® drives are available.
Negligible EMI: PILine® drives do
not create magnetic fields nor are they influenced by them,
a decisive advantage in many applications.
Custom Solutions / Flexibility for OEMs:
PILine® drives are available in open-loop and
closed-loop translation stages and as OEM components. PI
develops and manufactures all piezo ceramic components
in-house. This gives us the flexibility to provide custom
motors (size, force, environmental conditions) for OEM and
research applications.
Quality, Lifetime, Experience: Based on PIs
30+ years of experience with piezo nanopositioning
technology, PILine® drives offer exceptional
precision and reliability with an MTBF of >20,000 hours.
Rotating components such as gears, shafts and moving cables
that are prone to failure in conventional motion systems,
are not part of the PILine® design.
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Fig. 4.
Settling behavior of a
PILine® M-663 linear stage, 100 µm step. A stable
position to within 0.1 µm can be reached in only 10 ms.
Fig. 5. Principle design of a PILine®
ultrasonic piezomotor-driven translation stage.
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