Magnetic Shape Memory (MSM) actuators in practical use

Majewska, Katarzyna; Żak, Arkadiusz; Ostachowicz, Wiesław

doi:10.1088/1742-6596/181/1/012073

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…In [38] a miniature MSMA-based harvesting device with an output power of 0.9 mW/cm 3 is described, together with a prototype sensor for micro displacement, which uses an LC circuit. Elsewhere, the practical usage of MSMA actuators for vibration reduction in a rotor system is described in [39].…”

Section: Current Start Pointmentioning

confidence: 99%

Design and Control of Magnetic Shape Memory Alloy Actuators

Minorowicz

Milecki

2022

Materials

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This paper presents research on the application of magnetic shape memory alloys (MSMAs) in actuator design. MSMAs are a relatively new group of so-called smart materials that are distinguished by repeatable strains up to 6% and dynamics much better than that of thermally activated shape memory alloys (SMAs). The shape change mechanism in MSMAs is based on the rearrangement of martensite cells in the presence of an external magnetic field. In the first part of the article a review of the current state of MSMA actuator design is presented, followed by a description of the design, modelling and control of a newly proposed actuator. The developed actuator works with MSMA samples of 3 × 10 × 32 mm3, guaranteeing an available operating range of up to 1 mm, despite its great deformation range and dynamics. In the paper its dynamics model is proposed and its transfer function is derived. Moreover, the generalised Prandtl-Ishlinskii model of MSMA-actuator hysteresis is proposed. This model is then inverted and used in the control system for hysteresis compensation. A special test stand was designed and built to test the MSMA actuator with compensation. The step responses are recorded, showing that the compensated MSMA actuator exhibits the positioning accuracy as ±2 µm. As a result, the authors decided to apply a control system based on an inverse hysteresis model. The paper concludes with a summary of the research results, with theoretical analysis compared with the registered actuator characteristics.

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Section: Current Start Pointmentioning

confidence: 99%

Design and Control of Magnetic Shape Memory Alloy Actuators

Minorowicz

Milecki

2022

Materials

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“…MSM alloys, sometimes referred to as Ferromagnetic Shape Memory Alloys (FSMA), are relatively new smart materials that alter their shape in response to magnetic fields or mechanical stresses [6]. The most studied MSM alloys are Ni-Mn-Ga single-crystal alloys, which provide a shape change of 6-12% depending on their microstructure and also produce output stresses of up to 3 MPa [7]. The available strain in MSM alloys is greater than that in magnetostrictive or piezoelectric materials and reaches the level of thermally controlled shape memory alloys (SMAs).…”

Section: A Magneto-mechanical Response Of Msm Alloysmentioning

confidence: 99%

“…where kspring is the spring coefficient in N/m, xin is the initial pre-strain of the spring in m, x is the lens displacement in m, ml and mh are the masses of the lens barrel and lens holder in kg, respectively, and g is the gravitational constant. Equation (7) shows that, even in the absence of an external load and compressive springs, the magnetic forces are still opposed by the inherent MSM holding forces that are responsible for the initial offset of the curves in Fig. 6.…”

Section: Forces Acting On Msm Elements In Camera Modulesmentioning

confidence: 99%

“…However, it should be noted that constant force springs are most suitable for MSM camera modules because MSM holding forces are almost independent of the lens position x as shown in (7). Thus, it is desirable that the change in ( ) with x is close to zero, which can be achieved with zero-free-length springs or springs wherein ≫ ∆ [38], [39].…”

Section: Forces Acting On Msm Elements In Camera Modulesmentioning

confidence: 99%

“…When a 65 g load is added to the connector, the minimum required current increases because the weight of the loads increases the total force acting on the MSM elements in (7). Although the maximum AF displacement is reduced, it still reaches 0.7 mm, which is considerably large for AF actuators.…”

Section: B Experimental Verification Of the Af Functionmentioning

confidence: 99%

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Next Generation Autofocus and Optical Image Stabilization System for Camera Modules Using Magnetic Shape Memory Actuators

Gabdullin

Ahmad

2020

IEEE Access

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Currently, camera modules are used in a wide range of applications ranging from micropositioning actuator systems used in smartphones to larger modules used in stationary cameras, CCTV, and others. Modern camera modules are required to perform positioning functions to improve the stability and quality of captured images. These functions mainly include the autofocus (AF) and optical image stabilization (OIS) functions. Traditionally, separate actuators and sensors are used for AF and OIS, each contributing towards energy consumption, module size, and manufacturing costs. This is particularly disadvantageous in the case of smartphones owing to their inherent space and battery charge limitations. This paper presents a novel Magnetic Shape Memory (MSM) actuator system that combines the AF and OIS functions, which are performed using two actuators; thus, this system is a simple, compact, and costeffective solution to the drawbacks of conventional technology. Furthermore, the smart properties of MSM alloys reduce the energy consumption of these systems through the utilization of their inherent holding forces and the associated shape memory effect. The realization of AF and OIS functions is discussed and verified experimentally for the proposed actuator system using data obtained from a fabricated prototype.

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Vibration control of a rotor by magnetic shape memory actuators—an experimental work

Majewska

Żak

Ostachowicz

2010

Smart Mater. Struct.

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Deficiencies in practical applications for magnetic shape memory actuators motivated the authors to start experimental and theoretical research in the field of multifunctional materials. The authors present the concept of using magnetic shape memory actuators for controlling, altering and tuning the forced vibration of a rotor. The main goal of their experimental research is to show how the activation of magnetic shape memory actuators can influence the forced vibration responses of a rotor in terms of altering and tuning selected rotor natural frequencies and modes of vibrations. Experimental results show that magnetic shape memory actuators can be successfully applied for vibration reduction and vibration control in the case of rotor systems.

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Magnetic Shape Memory (MSM) actuators in practical use

Cited by 3 publications

References 7 publications

Design and Control of Magnetic Shape Memory Alloy Actuators

Design and Control of Magnetic Shape Memory Alloy Actuators

Next Generation Autofocus and Optical Image Stabilization System for Camera Modules Using Magnetic Shape Memory Actuators

Vibration control of a rotor by magnetic shape memory actuators—an experimental work

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