High‐Speed Antagonistic Shape Memory Actuator for High Ambient Temperatures

Britz, Rouven; Rizzello, Gianluca; Motzki, Paul

doi:10.1002/adem.202200205

Cited by 6 publications

(6 citation statements)

References 32 publications

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“…[35][36][37] Britz et al presented a working prototype of a high-temperature SMA valve. [14] Under standard conditions, the conceptualized valve works at room temperature, and the pressure p does not exceed 1000 hPa. Under these conditions, the closing time of the valve is to be less than 1 s. Due to the restricted installation space and the necessary stroke of the valve tappet, the required SMA stroke amounts to 3%.…”

Section: Application Design For Wide Temperature Rangementioning

confidence: 99%

“…Examples for possible SMA‐driven applications in manufacturing processes are active valves for injection molding, valves for tempered media, and small gripping solutions at soldering stations, to name some. [ 14 ] For automotive applications in exterior and interior, operational temperatures typically go up to 80 °C to ensure functionality in all climates and operating states. Even if the expected operation conditions are around room temperature, the functionality of actuation systems is required to be robust.…”

Section: Introduction and Fundamentalsmentioning

confidence: 99%

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Electro–Thermo–Mechanical Characterization of Shape Memory Alloy Wires for Actuator and Sensor Applications, Part 2: High‐Ambient‐Temperature Behavior

Scholtes,

Seelecke,

Motzki

2024

Adv Eng Mater

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The typical phase transformation temperatures of commercially available shape memory alloys (SMA) for actuator applications are in the region of 80 °C to 90 °C for austenite finish and around 60 °C for martensite start. That limits the areas of application for SMA actuators, as increased ambient temperatures restrict their functionality. Especially in the industrial and automotive sectors, operational temperatures of 80 °C and higher are commonly required. This article discusses the limits of operation temperatures for commercially available SMA actuator wires. Also, methods to increase this critical temperature limit, at which the SMA actuation strain falls below a certain threshold, are proposed. By means of electro‐thermal actuation experiments, the influence of the variation of bias loads and an additional training method are investigated. Supported by these results, an exemplary valve actuator system is designed, which exhibits consistent stroke in a wide range of ambient temperatures. All experiments and measurements are conducted on a custom designed test bench with the same commercially available SMA wire. The test bench is in the following used again to evaluate the designed SMA valve actuator.This article is protected by copyright. All rights reserved.

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Section: Application Design For Wide Temperature Rangementioning

confidence: 99%

Section: Introduction and Fundamentalsmentioning

confidence: 99%

Electro–Thermo–Mechanical Characterization of Shape Memory Alloy Wires for Actuator and Sensor Applications, Part 2: High‐Ambient‐Temperature Behavior

Scholtes,

Seelecke,

Motzki

2024

Adv Eng Mater

Self Cite

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“…Wire actuators are usually activated by means of electrical current through the inherent resistance of the shape memory material. In addition to wire actuators, there are also SMA springs, tubes, bundles and other designs, often specifically developed for applications [26][27][28][29].…”

Section: Shape Memory Alloy Actuatorsmentioning

confidence: 99%

Smart Shape Memory Alloy Actuator Systems and Applications

Motzki,

Rizzello

2023

Shape Memory Alloys - New Advances

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Shape memory alloys (SMAs) have been established in a wide range of applications. Lead by the medical sector, nickel-titanium-based alloys are used for the realization of stents, guide wires, and other medical or surgical equipment. Besides this field, where mainly the superelastic material characteristics are used, first products based on actuation via the shape memory effect have been introduced to the market. These shape memory actuators or actuator systems either use temperature change directly for the realization of work output, for example, in thermostat valves, or are thermally activated by an applied electric current. This chapter gives an overview of recent SMA-based actuator systems and applications in a variety of fields from industry over bionics to automotive and aerospace.

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“…This kind of system has been implemented to emulate the behaviour of biological systems [ 30 , 31 , 32 ]. It must be pointed out that this kind of mechanism is highly valuable when some kinds of transmission mechanisms are applied, such as a driven cable [ 33 , 34 ], or when a special class of smart actuator is implemented such as the shape memory alloys [ 27 , 35 , 36 ], pneumatic actuators [ 37 , 38 ], and electro-chemical actuators [ 39 , 40 ].…”

Section: Sma Linear Actuator Mathematical Modelmentioning

confidence: 99%

Position Measurements Using Magnetic Sensors for a Shape Memory Alloy Linear Actuator

Vega

Cubas

Sandoval-Chileño

et al. 2022

Sensors

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This article presents the design and implementation of a linear actuator based on NiTi Shape Memory Alloys with temperature and position measurements based on a magnetic sensor array and a set of thermistors. The position instrumentation is contact free to avoid friction perturbations; the position signal conditioning is carried out through the calculation of the response of each magnetic sensor, selecting the closest sensor to ensure accurate results on the full range of movement. Experimental results validate the accuracy of the position sensing with a competitive behaviour.

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High‐Speed Antagonistic Shape Memory Actuator for High Ambient Temperatures

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adem.202200205.

Cited by 6 publications

References 32 publications

Electro–Thermo–Mechanical Characterization of Shape Memory Alloy Wires for Actuator and Sensor Applications, Part 2: High‐Ambient‐Temperature Behavior

Electro–Thermo–Mechanical Characterization of Shape Memory Alloy Wires for Actuator and Sensor Applications, Part 2: High‐Ambient‐Temperature Behavior

Smart Shape Memory Alloy Actuator Systems and Applications

Position Measurements Using Magnetic Sensors for a Shape Memory Alloy Linear Actuator

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