Featured Research

from universities, journals, and other organizations

New Flat Motor Can Drive Shape Shifters, Movers And Shakers

Date:
January 29, 2003
Source:
Penn State
Summary:
Penn State engineers have developed a low- cost, high-torque rotary motor, based on "smart" materials, that can be configured in a wide range of formats, including one as flat and thin as a CD case.

Penn State engineers have developed a low- cost, high-torque rotary motor, based on "smart" materials, that can be configured in a wide range of formats, including one as flat and thin as a CD case.

The inventors say that, in the flat format, the motor could be used to drive changes in the camber of airplane wings or fins, essentially shape-shifting the curvature of the wing or fin surface.

In other formats, the motor could work in tightly integrated spaces where other motors can't fit. For example, the "smart" material motor could serve as the drive element in thinner, lighter, laptop computers or other compact, portable consumer products or in manufacturing equipment that processes things by moving or shaking them.

Dr. Gary Koopmann, distinguished professor of mechanical engineering and director of Penn State's Center for Acoustics and Vibration (CAV), led the development team. He says the flat motor has a starting torque advantage over conventional electric motors since speed is not required for high torque output.

The prototype flat motor has reached a free speed of 760 revolutions per minute and a maximum torque of 0.4 Nm.

Components for the prototype cost less than $150 off-the-shelf. Koopmann estimates that an optimized version of the flat motor might cost as little as $10 to mass produce.

The device was patented recently by Penn State. The inventors are Koopmann; Dr. Weicheng, CAV laboratory manager; Dr. George Lesieutre, professor of aerospace engineering and CAV associate director; Dr. Jeremy Frank, president, KCF Technologies; and Dr. Eric Mockensturm, assistant professor of mechanical engineering.

The new motor works by translating the bending of a "smart" material into the turning of a shaft. The "smart" material the inventors use is PZT (lead zirconate titanate), an inexpensive, commonly available piezoelectric that elongates when an electric field is applied to it. By bonding PZT to both sides of a tiny, flexible, metallic strip, they create an "arm" that can bend to the left and right in response to an electric field.

Placing 12 of the "arms" star-fish-style around a central shaft, the inventors stimulate them simultaneously and they all bend in the same direction. A passive clamping system, either a ball and spring arrangement or a commercial one-way roller clutch, acts as a kind of turnstile that only allows the motion to ratchet along in one direction, translating the bending into rotation of the central shaft.

Koopmann explains that using passive clamping significantly improves the performance and lowers the cost of the flat motor versus inch-worm type designs, which also use the small oscillatory motions of smart materials but require precision machining.

The development of the new motor was supported by grants from the Defense Advanced Research Projects Agency. The motor has been described in "Optimization of a Resonant Bimorph Actuator Drive" published in the Proceedings of DETC 01, the ASME 2001 Design Engineering Technical conference held Sept. 9-12, 2001 in Pittsburgh, Pa.


Story Source:

The above story is based on materials provided by Penn State. Note: Materials may be edited for content and length.


Cite This Page:

Penn State. "New Flat Motor Can Drive Shape Shifters, Movers And Shakers." ScienceDaily. ScienceDaily, 29 January 2003. <www.sciencedaily.com/releases/2003/01/030129080137.htm>.
Penn State. (2003, January 29). New Flat Motor Can Drive Shape Shifters, Movers And Shakers. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2003/01/030129080137.htm
Penn State. "New Flat Motor Can Drive Shape Shifters, Movers And Shakers." ScienceDaily. www.sciencedaily.com/releases/2003/01/030129080137.htm (accessed September 30, 2014).

Share This



More Matter & Energy News

Tuesday, September 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Argentina's Tax Evaders Detected, Hunted Down by Drones

Argentina's Tax Evaders Detected, Hunted Down by Drones

AFP (Sep. 30, 2014) Argentina doesn't only have Lionel Messi the footballer, it has now also acquired "Mesi" the drone system which monitors undeclared mansions, swimming pools and soy fields to curb tax evasion in the country. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Do Video Games Trump Brain Training For Cognitive Boosts?

Do Video Games Trump Brain Training For Cognitive Boosts?

Newsy (Sep. 29, 2014) More and more studies are showing positive benefits to playing video games, but the jury is still out on brain training programs. Video provided by Newsy
Powered by NewsLook.com
CERN Celebrates 60 Years of Science

CERN Celebrates 60 Years of Science

Reuters - Business Video Online (Sep. 29, 2014) CERN, the European Organisation for Nuclear Research, celebrates 60 years of bringing nations together through science. As Joanna Partridge reports from inside the famous science centre it's also planning to turn the Large Hadron Collider particle accelerator back on after an upgrade. Video provided by Reuters
Powered by NewsLook.com
This 'Invisibility Cloak' Is Simpler Than Most

This 'Invisibility Cloak' Is Simpler Than Most

Newsy (Sep. 28, 2014) Researchers from the University of Rochester have created a type of invisibility cloak with simple focal lenses. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins