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PD1D Piezo Inertia Drive Stage Chapter 7: Frequently Asked Questions
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Chapter 7 Frequently Asked Questions
How does a piezo inertia motor work?
A piezo inertia stage uses friction and inertia (“stick” and “slip”) to drive the moving platform. The piezo stack is
driven by a sawtooth voltage waveform. As the voltage is ramped up, the piezo will extend and push the moving
platform (stick). When the voltage is dropped to zero, the piezo returns to its original length. By using different rates
of voltage rise and fall, the moving platform travels more in one direction than the other due to inertia and different
frictional coefficients, resulting in residual linear travel.
What applications can they be used for?
Any ‘set-and-forget’ application, particularly where space is tight. The primary function of the PD1D(/M) stage is
relative position and hold. The step size is dependent upon preload, and will differ between stages and applications.
They are not suitable where repeatable step size is required.
What is the lifetime of a typical piezo inertial motor?
The piezo stack of the actuator is rated for a service life of over 10 billion steps. With proper maintenance (see
Section 5.2), the wear performance of the stage’s friction parts should endure for this lifetime, however the speed
variation could change by up to 50% or more over time.
What driver can I use?
The PD1D(/M) stage must be driven by a 2019 or newer version of Thorlabs KIM101 controller (per the S/N label)
with a firmware revision of 010007 or higher, or any version of a Thorlabs KIM001 controller. Earlier versions of the
KIM101 controller or those with older firmware will not function properly and may cause failure of the stage and/or
the controller. The previous-generation TIM101 controller is not compatible. It’s also recommended to use latest
version of Kinesis software to remotely control KIM101/KIM001.
Ensure the controller’s stage mode is set to “PD(R)” for KIM101/KIM001.
What is the maximum length of cable?
The stages are shipped with 1 m (3.3 ft) of cable. Thorlabs offers the PAA101 1.5 m extension cable and the T5026
male adapter, available at www.thorlabs.com, which can be used to extend the cable length to 2.5 m. Due to the
capacitance of the cables, do not use cables longer than 2.5 m in total.
Why the speed differs between forward and backward directions?
Due to the open loop design, piezo hysteresis, component variance, and application conditions, there would be a
speed difference between two directions. Improper drive signal (wrong stage type selection, low driving frequency),
uneven mounting surface or unstable mounting, gravity of the carriage plate and load would also influence or
increase the speed difference between two directions.