High-speed, helical and self-coiled dielectric polymer actuator

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

Novel actuator materials are necessary to advance the field of soft robotics. However, since current solutions are limited in terms of strain, strain rate, or robustness, a new actuator type was developed. In its basic configuration, this actuator consisted of four layers and self-coiled into a helix after pre-stretching. The actuator principle was a dielectric polymer actuator. Instead of an elastomer, a thin thermoplastic film, in this case polyethylene, was used as the dielectric and the typically low potential strain was amplified more than 40 times by the helical set-up. In a hot press, the thermoplastic film was joined together with layers of carbon black employed as electrodes and a highly elastic thermoplastic polyurethane film. Once the stack was laser cut into thin strips, they were then stretched over the polyethylene (PE) film’s limit of elasticity and released, thus forming a helix. The manufactured prototype showed a maximum strain of 2% while lifting six times its own weight at actuation frequencies of 3 Hz, which is equivalent to a strain rate of 12%/s. This shows the great potential of the newly developed actuator type. Nevertheless, materials, geometry as well as the manufacturing process are still subject to optimization.

Details

Original languageEnglish
Article number15
Pages (from-to)1-10
Number of pages10
Journal Actuators : open access journal
Volume10
Issue number1
Publication statusPublished - 2021
Peer-reviewedYes

External IDs

Scopus 85100186993
ORCID /0000-0001-7698-9095/work/142245210
ORCID /0000-0003-1058-4030/work/142246435
Mendeley fbdf420c-2bb4-3e9a-b1bb-1de1a3f3c08e

Keywords

Keywords

  • dielectric, polymer actuator, Artificial muscle, Self-sensing, Dielectric polymer actuator, Self-coiled actuator, Soft actuator