Development of an Actuator for Translatory Movement by Means of a Detented Switching Shaft Based on a Shape Memory Alloy Wire for Repeatable Mechanical Positioning
Actuators based on the shape memory effect have recently become more and more economically important due to the many advantages of shape memory alloys (SMAs), such as their high energy density. SMAs are usually used to control the end/maximum positions, thus the actuators always move between two pos...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-02-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/2/163 |
| _version_ | 1827602586054688768 |
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| author | Tobias Schmelter Benedict Theren Sebastian Fuchs Bernd Kuhlenkötter |
| author_facet | Tobias Schmelter Benedict Theren Sebastian Fuchs Bernd Kuhlenkötter |
| author_sort | Tobias Schmelter |
| collection | DOAJ |
| description | Actuators based on the shape memory effect have recently become more and more economically important due to the many advantages of shape memory alloys (SMAs), such as their high energy density. SMAs are usually used to control the end/maximum positions, thus the actuators always move between two positions. The repeatable control of intermediate positions has so far proven difficult, because in most cases, external sensors are necessary to determine the length of the SMA element. Additionally control strategies for SMA actuators are rather complex due to the non-linear behavior of this material. The SMA actuator presented here is able to control intermediate positions with repeatable accuracy without the need of a separate control technology. The integrated control unit is based on a mechanical principle using a shaft with a circumference groove. This groove has a height profile that turns the shafts rotation, generated by the SMA, into a translational movement. Therefore, the SMA wire generates a partial stroke at each complete activation, turning the shaft partially. With several activation cycles in a row, the stroke adds up until reaching the maximum. A further activation cycle of the wire resets the actuators stroke to its initial position. Each part of the stroke can, thereby, be controlled precisely and repeatedly within the scope of each complete cycle of the actuator. Based on an integrated ratchet, each stroke of the actuator can hold energy free. |
| first_indexed | 2024-03-09T05:22:34Z |
| format | Article |
| id | doaj.art-cce4f8eae6aa4a62bcc71a0af990334e |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T05:22:34Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-cce4f8eae6aa4a62bcc71a0af990334e2023-12-03T12:39:54ZengMDPI AGCrystals2073-43522021-02-0111216310.3390/cryst11020163Development of an Actuator for Translatory Movement by Means of a Detented Switching Shaft Based on a Shape Memory Alloy Wire for Repeatable Mechanical PositioningTobias Schmelter0Benedict Theren1Sebastian Fuchs2Bernd Kuhlenkötter3Chair of Production Systems, Ruhr-University of Bochum, Universitaetsstrasse 150, 44801 Bochum, GermanyChair of Production Systems, Ruhr-University of Bochum, Universitaetsstrasse 150, 44801 Bochum, GermanyMMB Maschinen, Montage & Betriebsmitteltechnik GmbH, Am Lindenkamp 17, 42549 Velbert, GermanyChair of Production Systems, Ruhr-University of Bochum, Universitaetsstrasse 150, 44801 Bochum, GermanyActuators based on the shape memory effect have recently become more and more economically important due to the many advantages of shape memory alloys (SMAs), such as their high energy density. SMAs are usually used to control the end/maximum positions, thus the actuators always move between two positions. The repeatable control of intermediate positions has so far proven difficult, because in most cases, external sensors are necessary to determine the length of the SMA element. Additionally control strategies for SMA actuators are rather complex due to the non-linear behavior of this material. The SMA actuator presented here is able to control intermediate positions with repeatable accuracy without the need of a separate control technology. The integrated control unit is based on a mechanical principle using a shaft with a circumference groove. This groove has a height profile that turns the shafts rotation, generated by the SMA, into a translational movement. Therefore, the SMA wire generates a partial stroke at each complete activation, turning the shaft partially. With several activation cycles in a row, the stroke adds up until reaching the maximum. A further activation cycle of the wire resets the actuators stroke to its initial position. Each part of the stroke can, thereby, be controlled precisely and repeatedly within the scope of each complete cycle of the actuator. Based on an integrated ratchet, each stroke of the actuator can hold energy free.https://www.mdpi.com/2073-4352/11/2/163shape memory alloyshape memory actuatorposition controlenergy freemechanical controlrepeatability |
| spellingShingle | Tobias Schmelter Benedict Theren Sebastian Fuchs Bernd Kuhlenkötter Development of an Actuator for Translatory Movement by Means of a Detented Switching Shaft Based on a Shape Memory Alloy Wire for Repeatable Mechanical Positioning Crystals shape memory alloy shape memory actuator position control energy free mechanical control repeatability |
| title | Development of an Actuator for Translatory Movement by Means of a Detented Switching Shaft Based on a Shape Memory Alloy Wire for Repeatable Mechanical Positioning |
| title_full | Development of an Actuator for Translatory Movement by Means of a Detented Switching Shaft Based on a Shape Memory Alloy Wire for Repeatable Mechanical Positioning |
| title_fullStr | Development of an Actuator for Translatory Movement by Means of a Detented Switching Shaft Based on a Shape Memory Alloy Wire for Repeatable Mechanical Positioning |
| title_full_unstemmed | Development of an Actuator for Translatory Movement by Means of a Detented Switching Shaft Based on a Shape Memory Alloy Wire for Repeatable Mechanical Positioning |
| title_short | Development of an Actuator for Translatory Movement by Means of a Detented Switching Shaft Based on a Shape Memory Alloy Wire for Repeatable Mechanical Positioning |
| title_sort | development of an actuator for translatory movement by means of a detented switching shaft based on a shape memory alloy wire for repeatable mechanical positioning |
| topic | shape memory alloy shape memory actuator position control energy free mechanical control repeatability |
| url | https://www.mdpi.com/2073-4352/11/2/163 |
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