Ultra-precision positioning

Mar 25, 2013

A novel rotary actuator provides greater torque, accuracy, and speed.

Ultra-precision positioning is required for the success of many scientific applications, including manufacturing semiconductors, aligning optics and manipulating cells. One of the challenges of ultra-precise positioning is providing sufficient torque through small, precise angles. In a paper accepted for publication in the Review of Scientific Instruments, a journal of the , researchers describe a new rotary actuator that accurately delivers more torque than previous devices.

Like many other ultra-precise rotary actuators, the new device's action is driven by piezoelectric material, which converts electrical signals into mechanical movement. The researchers improved upon previous designs with a clamp that integrates the driving and stopping action and can be moved to different distances from the rotor's center. That gives the researchers both more power and control of the driving forces. Like rotating a , it is easier to control the torque and speed of the wheel by varying both the force as well as the distance from the center that force is applied.

The researchers report approximately four-fold improvements in both maximum loading torque and accuracy over other at the maximum driving frequency of the other devices. While the new device can be driven at higher frequencies, the resulting higher speeds mean less accuracy because the rotor is harder to stop due to the additional of the rotor. The researchers are working on a new clamping design to overcome that limitation.

Explore further: Student designs and develops revolutionary new hand-held laminating tool

More information: "Design and experimental research of a novel inchworm type piezo-driven rotary actuator with the changeable clamping radius," is published in the Review of Scientific Instruments. rsi.aip.org/resource/1/rsinak/v84/i1/p015006_s1

add to favorites email to friend print save as pdf

Related Stories

Higher energy yield with torque vectoring gears

Feb 23, 2011

Wind turbines have a problem: Depending on the wind's force, the rotational speed of the turbine and thus of the generator changes. However, alternating current must be fed into the grid with precisely 50 (or 60) hertz. Typically ...

Smart helicopter thanks to active rotor blades

Mar 06, 2013

Active systems in helicopter rotor blades can adapt the blades' aerodynamic properties to local airflow conditions. The use of such systems leads to lower fuel consumption, increased maximum speed and reduced noise and vibration. ...

Philips displays innovative rotary wheel remote controls

Sep 07, 2007

Philips today unveiled their revolutionary new rotary wheel remote control technology for consumer electronic device manufacturers. Designed to enable quick and intuitive navigation of user interfaces & scrolling through ...

Recommended for you

EDAG car with textile skin set for Geneva show

5 hours ago

Making its debut at the Geneva Motor Show 2015 is the EDAG Light Cocoon. This is promoted as a new dimension for lightweight construction, a sportscar with a textile outer skin panel. The EDAG Light Cocoon ...

Stanford aims to bring player pianos back to life

19 hours ago

(AP)—Stanford University wants to unlock the secrets of the player piano, which brought recorded music into living rooms long before there were cassettes, compact discs or iPods.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.