Can Geared Steppers or Coreless DC Motors Achieve Nanopositioning?

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SUMMARY

This discussion focuses on the potential of geared steppers and coreless DC motors for achieving nanopositioning, a precision level typically associated with piezo actuators. Participants express skepticism about the vibrational noise of steppers, yet some claim micron resolution with 5-phase steppers. The conversation also explores the use of electrostatic actuators and commercial interferometers that utilize air bearings and active feedback control for stabilization. Key insights suggest that while traditional steppers may struggle with nanopositioning, advancements in motor technology could provide viable alternatives.

PREREQUISITES
  • Understanding of nanopositioning principles
  • Familiarity with actuator types, specifically piezo and electrostatic actuators
  • Knowledge of motor technologies, including geared steppers and coreless DC motors
  • Basic concepts of interferometry and feedback control systems
NEXT STEPS
  • Research the specifications and performance of 5-phase stepper motors for precision applications
  • Investigate the design and functionality of electrostatic actuators for nanopositioning
  • Explore the principles of air bearing systems in interferometry
  • Learn about active feedback control mechanisms in precision motion systems
USEFUL FOR

Engineers, researchers, and developers involved in precision motion control, particularly those interested in actuator technology and nanopositioning applications.

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I'm curious about nanometer precision actuators, I wrote a short review of the Piezo actuator types I'm aware of here:

http://41j.com/blog/2014/09/piezo-actuators-a-review/

But does anyone have any information on other actuator types capable of nanopositioning? Are there any electrostatic actuators suitable for nanopositioning applications?

My understanding was that steppers have too much vibrational noise to be used for nanoposiitoning, but I've recently purchased some stages which claim micron resolution using 5-phase steppers. Can geared steppers or perhaps coreless DC motors be used for nanopositioning applications?
 
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new299 said:
I'm curious about nanometer precision actuators, I wrote a short review of the Piezo actuator types I'm aware of here:

http://41j.com/blog/2014/09/piezo-actuators-a-review/

But does anyone have any information on other actuator types capable of nanopositioning? Are there any electrostatic actuators suitable for nanopositioning applications?

My understanding was that steppers have too much vibrational noise to be used for nanoposiitoning, but I've recently purchased some stages which claim micron resolution using 5-phase steppers. Can geared steppers or perhaps coreless DC motors be used for nanopositioning applications?

Some commercial interferometers use an air bearing to mount the movable mirror (with a solenoid ? with active feedback control) to stabilize the mirror at the zero crossings of a He:Ne reference laser (+/- few nm).
 

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