Rotational mini-actuator activated by two antagonist shape memory alloy wires

Nespoli, Adelaide; Bassani, E.; Besseghini, S.; Villa, Elena

doi:10.1016/j.phpro.2010.11.096

Cited by 19 publications

(18 citation statements)

References 6 publications

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“…When embedded in mini-modular device, the snake-like wire does not lose its mechanical performance. As an example, in Figure 15 a miniature rotational actuator composed by two mutual antagonist NiTi snake-like wire is reported [34]. The device exerts a stroke of about 120° under a constant torque of 0.1Nmm, as shown in Figure 16; it is activated by 0.6A with a maximum power consumption of 1W and a work frequency of 0.05Hz.…”

Section: Snake-like Sma Actuatorsmentioning

confidence: 99%

New Developments on Mini/Micro Shape Memory Actuators

Nespoli¹,

Biffi²,

Casati³

et al. 2012

Smart Actuation and Sensing Systems - Recent Advances and Future Challenges

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Section: Snake-like Sma Actuatorsmentioning

confidence: 99%

New Developments on Mini/Micro Shape Memory Actuators

Nespoli¹,

Biffi²,

Casati³

et al. 2012

Smart Actuation and Sensing Systems - Recent Advances and Future Challenges

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“…A microflow valve and a microclamp were designed to demonstrate the application potential of the actuator. Since then, several studies on SMA actuator–based rotary motors were published (Kuribayashi, 1997, 2003; Lan et al, 2009; Nespoli et al, 2010a; Reynaerts and Brussel, 1998; Song, 2007; Tanaka and Yamada, 1991; Yamano et al, 2010; Yuan et al, 2018; Zhang and Yan, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Sharma et al (2008a, 2008b, 2008c) constructed a continuous and bidirectional rotating motor where three SMA wires are connected to an eccentric axis producing motion through the alternate activation of these wires. Nespoli et al (2010a) presented a new rotational mini actuator, denominated ROTOsma-1, consisting of two antagonist SMA elements with a snake-like shape. Zhang and Yan (2012) designed a continuous and unidirectional motor driven by SMA wires which were grouped in five segments.…”

Section: Introductionmentioning

confidence: 99%

A compact rotary motor actuated by shape memory alloy mini springs

Sobrinho

Cunha

Emiliavaca

et al. 2020

Journal of Intelligent Material Systems and Structures

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Shape memory alloys have recently gained attention for applications in motor driving components. The most expressive advantage of shape memory alloy components in that type of application is the high torque to motor weight ratio. Considering the importance of these studies, this article presents the design, manufacture, and theoretical and experimental analyses of a rotary motor driven by Ni–Ti shape memory alloy mini springs. The adopted motion mechanism allows the motor to run in continuous and bidirectional rotation mode, where speed and torque are determined by a drive sequence. A simplified analytical model was implemented, considering the thermomechanical characteristics of the shape memory alloy springs. Experimental tests with and without electrical drives were performed using properly designed electronic measurement instrumentation. The principal scientific contribution of this work is the demonstration of the motor’s functionality and torque generation. An energy density index of 1.41 × 10−3 Nmm/mm3 was attained, which is higher to those of other similarly constructed motors in the literature.

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“…In previous studies [25,26], an uncommon snake-like geometry has been proposed as a possible alternative to the wire and spring shapes, especially in confined spaces.…”

Section: Introductionmentioning

confidence: 99%

Functional properties and morphology of NiTi articulated actuation elements during thermo-mechanical cyclic tests

2015

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Shape memory alloys (SMAs) are active materials able to recover large strains over several thermo-mechanical cycles. In the actuation field, this strain recovery is principally exploited on the mini and micro scales at which SMAs exhibit their highest power density with respect to common lightweight technologies. During the repetitive actuation of a SMA element, certain events occur: strain drift at the beginning of cyclic testing, the accumulation of plastic deformation, and strain stabilisation. In this study, these events as well as the overall mechanical response of an articulated NiTi element were monitored through calorimetry and scanning electron microscopy. Fatigue and cyclic stability were tested under different loads and under different aging conditions. In addition, the surface morphology was continuously observed via scanning electron microscopy to monitor crack growth and propagation during the fatigue test. Finally, before and after the fatigue test, samples were tested through calorimetry to investigate the overall microstructural homogeneity. Results confirm the high potential of the proposed geometry for the development of NiTi non-conventional active elements in the miniature actuation field.

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Rotational mini-actuator activated by two antagonist shape memory alloy wires

Cited by 19 publications

References 6 publications

New Developments on Mini/Micro Shape Memory Actuators

New Developments on Mini/Micro Shape Memory Actuators

A compact rotary motor actuated by shape memory alloy mini springs

Functional properties and morphology of NiTi articulated actuation elements during thermo-mechanical cyclic tests

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