Tether free actuator hailed as soft robotics breakthrough

Jon Excell for The Engineer:  Designed by a team at the Max Planck Institute for Intelligent Systems in Stuttgart, the new device is claimed to have considerable advantages over existing pneumatically-powered soft actuators as it doesn’t require a tether.

The device consists of a dielectric elastomer actuator (DEA): a membrane made of hyperelastic material like a latex balloon, with flexible (or ‘compliant’) electrodes attached to each side.

The stretching of the membrane is regulated by means of an electric field between the electrodes, as the electrodes attract each other and squeeze the membrane when voltage is applied. By attaching multiple such membranes, the place of deformation can be shifted controllably in the system. Air is displaced between two chambers.

The membrane material has two stable states. In other words, it can have two different volume configurations at a given pressure without the need to minimize the larger volume. Thanks to this bi-stable state, the researchers are able to move air between a more highly inflated chamber and a less inflated one. They do this by applying an electric current to the membrane of the smaller chamber which responds by stretching and sucking air out of the other bubble.  Cont'd...

Comments (0)

This post does not have any comments. Be the first to leave a comment below.


Post A Comment

You must be logged in before you can post a comment. Login now.

Featured Product

Midwest Motion Products Inc - “GRA52” Right Angled Gearmotor System

Midwest Motion Products Inc - "GRA52" Right Angled Gearmotor System

Midwest Motion Products Inc., based in Howard Lake, Minnesota, is pleased to announce the release of the new "GRA52" Right Angled Gearmotor System. This new 1:1 Right Angled Gearbox allows for significantly increased versatility, and design whose geometry allows for the unit to be mounted in tight spaces. We employ our Standard Brushed or Brushless DC Motors and Planetary Gearheads to complete the new R/A Design. Features/Benefits: Cost effective design - as low as $250*, Very Versatile - Output Ratios ranging from 3.7:1 to 2076:1, Fully Reversible Design, Readily available - Samples can be built from Stock Material, High Volume capacity.