Foundation Layer
Fundamentals
The physics of ultrasonic piezoelectric motion. From crystal structure to closed-loop control. Each article is the most thorough practitioner treatment of its topic available on the open web.
How ultrasonic piezoelectric motors work
The physics of resonant stator actuation
The piezoelectric effect: from crystal structure to force generation
How atomic asymmetry in ceramics creates the mechanical forces that drive ultrasonic motors
Resonant frequency, stator design, and what determines motor bandwidth
How the geometry and material properties of a piezoelectric stator define its vibration modes, operating frequency, and dynamic response
Closed-loop control of piezo motors: encoder selection, controller architecture, PID tuning
Building servo systems around friction-drive actuators that have no inherent position feedback
Piezo motor specifications explained: what the datasheet doesn't tell you
How to read piezoelectric motor datasheets critically, understand the test conditions behind the numbers, and ask the right questions
Vacuum and cleanroom operation: why piezo outperforms electromagnetic alternatives
Outgassing, particle generation, magnetic interference, and design strategies for UHV and EUV environments
Thermal behaviour of piezo actuators: the 60°C stator shift problem
Resonant frequency drift, Curie temperature limits, and thermal management for reliable operation
Life expectancy and wear mechanisms in ultrasonic piezo motors
Friction interface degradation, ceramic fatigue, duty cycle effects, and practical lifetime predictions
Power electronics for piezo motors: drive voltage, current, and controller integration
AC excitation, voltage levels, power factor, third-party controller integration, and battery operation
Repeatability vs. absolute accuracy in piezo stage selection
Why these two specifications describe fundamentally different capabilities, and how to choose the one that matters for your process
Constant velocity scanning with piezo: why uniformity matters more than peak speed
Velocity ripple, controller bandwidth, and the scanning profiles that determine process quality
Multi-axis piezo configurations: stacking, interpolation, and controller architecture
XY and XYZ stage design choices and the controller architectures that make them work
Payload mounting and centre of gravity offset: moment loading effects on stage life and accuracy
How off-centre payloads generate moment loads that degrade bearing life, increase positioning error, and limit dynamic performance