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Potential of magnetic shape memory alloys in medical applications

Potential of magnetic shape memory alloys in medical applica...

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作者： Hutter, Marco Mayer, Juliane Schäfer, Max B. Pott, Peter P. Gundelsweiler, Bernd Institute of Design and Production in Precision Engineering University of Stuttgart Stuttgart Germany Institute of Medical Device Technology University of Stuttgart Stuttgart Germany

Systems based on smart materials have become an increasing research focus in recent years, as their properties provide opportunity for higher functional integration, improved energy efficiency and completely new functionalities. Magnetic shape memory alloys (MSM) provide a promising option here. However, they have received limited attention in the field of medical engineering. This paper therefore aims to provide an introduction into the (magneto-mechanical) properties of MSM and to give an overview of existing applications-oriented research, both in general and in medical engineering. In the reviewed literature, NiMnGa has been used in several prototypes of micro pumps for intracranial drug delivery and lab-on-a-chip systems. FePd, another MSM alloy, has aroused interest in research into temporary implants. © 2024 The Author(s),

关键词： Biocompatibility

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Inductively powered Linear Direct Drive with multiple Armatures

Inductively powered Linear Direct Drive with multiple Armatu...

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ETG-Fachtagung Electromechanical Drive Systems 2021

作者： Mittag, Marcel Gundelsweiler, Bernd Institute of Design and Production in Precision Engineering University of Stuttgart Germany

ISBN: (纸本)9783800756872

Linear direct drives are characterized by high dynamics and positioning accuracy. They are designed as a moving coil or moving magnet system. On the one hand, a system with moving magnets operates without power supply to the armature. However, an increased material and control effort as well as greater latching forces are to be expected caused by the coils being located in the stator. On the other hand, drives with a moving coil system have high dynamics due to the lower moving mass, with less cooling possibilities and require the power supply to be carried along. In pick-and-place applications, where several armatures are usually in use, an additional amount of space is needed for the trailing chains used for this purpose. They are also susceptible to wear and act as an additional disturbing force on the armatures. Conductor rails provide an alternative, but they pose a safety risk due to possible sparking. Inductive energy transmission, which is already established in many sectors, also has potential for use on an industrial scale. Particularly in the area of linear direct drives, this is not yet the case. This publication describes a possibility to build a multi-armature system with wireless operation capabilities. Due to its design, it can be extended easily to accommodate a large number of armatures, while still keeping the complexity as low as possible. A decisive factor here is the rectification of the voltage on the secondary side, which is achieved by an active synchronous rectifier. Due to the serial-serial design of the transmission system, a constant secondary voltage can be ensured by regulating the primary current. Finally, this results in a concept that offers a controllable and predictable system behaviour for a multi-armature system. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Electric rectifiers

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Development of an electromagnetic actuator with magnetic-shapememory active core for stroke enlargement and noise reduction

Development of an electromagnetic actuator with magnetic-sha...

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ETG-Fachtagung Electromechanical Drive Systems 2021

作者： Mauch, Manuel Hutter, Marco Gundelsweiler, Bernd Institute of Design and Production in Precision Engineering University of Stuttgart Germany

ISBN: (纸本)9783800756872

As a high-efficiency electro-mechanical drive element for limited rotational and linear movements in many areas of technology, an electromagnet first converts the electrical energy introduced into magnetic energy before it is converted into kinetic energy [1]. Depending on the area of application, electromagnets can be divided into actuating and holding solenoids among other distinctions [2]. On the one hand, an actuating solenoid is characterized by the coverage of a larger setting range up to a few millimeters with an adjustable force-displacement characteristic. design adjustments to the soft magnetic components, i. e. the cone of the solenoid body, allow the force-displacement curve to be configured via magnetic flux density. The main tasks of a holding magnet, on the other hand, are the attraction and fixation of magnetizable workpieces or objects. Due to the generated magnetic holding force, ferromagnetic material is magnetized and held with high force by the generated magnetic field. However, the force effect is limited to a very short air gap of only a few tenths of a millimeter and is characterized by a strongly nonlinear increasing force-displacement characteristic with decreasing air gap up to the rear end position. In this paper, a hybrid holding-and-actuating solenoid is represented which combines the best of both worlds as accurately as possible. If established electromagnets are combined with novel materials, innovative actuator concepts can be developed, which are reinventing a well-known component. In this paper, these novel materials are magnetic-shape-memory alloys (MSM) made of nickel, manganese and gallium. Exposed to an external magnetic field, they are capable of up to 6 % strain in the vertical direction perpendicular to the magnetic field orientation. This intrinsic motion of the MSM-sticks can be harnessed for novel drive concepts like the hybrid holding-actuating solenoid presented in this paper. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Kinetic energy

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Hemispherical resonators made of soft and hard piezo material for planar ultrasonic motors 17

Hemispherical resonators made of soft and hard piezo materia...

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17th International Conference and Exhibition on New Actuator Systems and Applications, ACTUATOR 2021

作者： Schiele, Frank Gundelsweiler, Bernd Institute of Design and Production in Precision Engineering University of Stuttgart Pfaffenwaldring 9 Stuttgart70550 Germany

ISBN: (纸本)9783800754564

Monolithic piezoelectric hemispheres [1] used as ultrasonic resonators are a distinguishing feature when used in a planar XYPhi motor [2]. They are relatively easy to manufacture compared to composite resonators. This paper focuses on the optimization of motion trajectories of half-side excited hemispheres by using hard and soft piezo material. The trajectory can be reconstructed using its radial and tangential displacement and the phase between them. A simulative approach to predict and test the mode shapes of soft piezo hemispheres in linear small signal range is shown. High deflection amplitudes are associated with higher mechanical quality due to less damping. Hard piezo material offers higher values regarding the mechanical quality factor than soft material, which offers broadband excitability. Therefore, resonator prototypes were built from both material types in order to measure deflections in radial and tangential directions by using an out-of-plane and in-plane laser vibrometer setup. When half side was operated with a 15 V amplitude at resonance frequency, hard piezo material shows a significantly higher displacement, especially in the tangential direction. However, larger deviations occur with the different directional excitations in the tested hard piezo material prototype. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Resonators

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A Linear Magnetic Soft Actuator with Image-based Force Sensing for Mechanical Characterization of Soft Materials

A Linear Magnetic Soft Actuator with Image-based Force Sensi...

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2023 IEEE International Conference on Robotics and Biomimetics, ROBIO 2023

作者： Zhang, Wei Decker, Lea Brigadski, Tanja Gundelsweiler, Bernd Urschel, Sven Kaiserslautern University of Applied Sciences Department of Engineering Schoenstr. 11 Kaiserslautern67659 Germany Kaiserslautern University of Applied Sciences Department of Informatics and Microsystems Technology Zweibruecken67659 Germany University of Stuttgart Institute of Design and Production in Precision Engineering Department of Mechanical Engineering Stuttgart70569 Germany

ISBN: (纸本)9798350325706

Soft actuator plays a critical role in soft robotics. Mechanical characterization of the soft materials serves as a must-do process for accurate modelling, simulation and control of soft actuators. Uniaxial tensile test, as a fundamental testing modality, of fragile biological materials like hydrogel used in soft robotics, biomechanical systems and tissue engineering remains a challenge, because of their poor mechanical properties (kPa ~ MPa), sample gripping difficulties, low force range and hence inaccuracy of force sensing caused by friction of mechanical guidance. In this paper, a linear soft actuator with magnetic fixture and actuation is developed to address the mentioned problems. This device offers a loading range of 0.1 mN to 0.1 N and a corresponding stretching range of a few millimeters. A USB-microscope is employed for remote detection of displacement and force based on image processing and a magnetic-simulation-based lookup table. Maxwell model of viscoelastic material is adopted for system modelling and a closed-loop PI controller is designed here for steady force and displacement outputs. Finally, elastic, creep and relaxation tests are implemented on hydrogel and silicone materials. The reasonable results prove the feasibility of this measurement approach. This device stands out among various mechanical testing equipments due to its contactless, friction-free, low-cost and accurate operational modalities. © 2023 IEEE.

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Experimental investigation of an msm controlled reluctance actuator 17

Experimental investigation of an msm controlled reluctance a...

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17th International Conference and Exhibition on New Actuator Systems and Applications, ACTUATOR 2021

作者： Hutter, Marco Kazi, Arif Gundelsweiler, Bernd Institute of Design and Production in Precision Engineering University of Stuttgart Stuttgart Germany Faculty of Mechatronics and Optics Aalen University of Applied Science Aalen Germany

ISBN: (纸本)9783800754564

In a wide range of mechatronic applications, electromagnets generate forces. Their merits are in providing contactless forces, as well as the ease of control and manufacturing. However, generation of constant forces leads to heat build-up due to Ohmic losses. The temperature increase is especially undesirable in precision engineering applications, as it can negatively affect positioning accuracy. To address this issue, an actuator concept was developed with little to no power loss in constant operation and a compact design, while maintaining contactless force generation. The concept employs excitation by permanent magnets (PM) and control by variable magnetization of magnetic shape memory alloys (MSM). The development process was presented previously [1]. In this paper, experimental investigations for key features of this actuator design are addressed. These include multi-stable stroke adjustment of the MSM-sticks, achievable reluctance force variation and performance of the positioning system for MSM stick adjustment. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： precision engineering

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A Linear Magnetic Soft Actuator with Image-based Force Sensing for Mechanical Characterization of Soft Materials

A Linear Magnetic Soft Actuator with Image-based Force Sensi...

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IEEE International Conference on Robotics and Biomimetics

作者： Wei Zhang Lea Decker Tanja Brigadski Bernd Gundelsweiler Sven Urschel Department of Engineering Kaiserslautern University of Applied Sciences Kaiserslautern Germany Department of Informatics and Microsystems Technology Kaiserslautern University of Applied Sciences Zweibruecken Germany Department of Mechanical Engineering Institute of Design and Production in Precision Engineering University of Stuttgart Stuttgart Germany

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Piezo-actuated XYPhi-motor based on hemispherical resonators 12

Piezo-actuated XYPhi-motor based on hemispherical resonators

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12. ETG/GMM-Fachtagung Innovative Small Drives and Micro-Motor Systems, IKMT 2019 - 12th ETG/GMM Symposium Innovative Small Drives and Micro-Motor Systems, IKMT 2019

作者： Schiele, Frank Gundelsweiler, Bernd Schinköthe, Wolfgang Institute of Design and Production in Precision Engineering University of Stuttgart Germany

ISBN: (纸本)9783800750634

Ultrasonic piezo motors are used in precision positioning systems, especially when a magnetic field-free drive solution is required. Their strength also lies in zero energy consumption at stand still. The operating principle is based on resonant vibration of a piezo resonator and results in elliptical or linear, inclined trajectories moving a friction contact. Usually, these piezo motors are guided in a linear direction. In order to achieve a XYPhi-stage, a perpendicular setup of two linear drives combined with a rotational stage is typically required. This sandwich-like stacked setup leads to disadvantages, like large installation spaces and unnecessarily moved masses. To create movements in X-Y- and φ-direction on a single level platform, a setup is presented that uses three piezo resonators, each generating a three-dimensional trajectory. The all-ceramic, hemispherical vault piezo resonators used [1] prove to be a suitable alternative to composite resonators due to low manufacturing and assembly costs. A controller setup to control the direction of the motor is shown. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach

关键词： Resonators

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Cooling of linear direct drives in precision engineering with piezo fans 12

Cooling of linear direct drives in precision engineering wit...

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12. ETG/GMM-Fachtagung Innovative Small Drives and Micro-Motor Systems, IKMT 2019 - 12th ETG/GMM Symposium Innovative Small Drives and Micro-Motor Systems, IKMT 2019

作者： Strohmeyr, Simon Gundelsweiler, Bernd Schinköthe, Wolfgang Baazouzi, Sabri Institute of Design and Production in Precision Engineering University of Stuttgart Germany

ISBN: (纸本)9783800750634

Linear direct drives are used when high position accuracy and high dynamics in linear movements are required. During operation, drives can develop high temperatures which limit their performance. Especially drives with a moving coil have a poor thermal connection to the drive. This makes it difficult to transfer the heat caused by ohmic losses in the coil. In order to increase the power of the drive, an additional cooling system is required. The most commonly used systems are radial or axial fans, which increase the convection coefficients on the surface that needs to be cooled. These fans usually consist of a small DC motor, a bearing system and a fan impeller. These mechanical components, in particular, have an enormous effect on miniaturization, since the influence of friction increases with the downsizing of the system. This affects the efficiency and reliability of the cooling system. In frictionless systems, such as the piezoelectric fan [1] or the piezoelectric Dual Cooling Jet [2], an air flow is generated via the piezoelectric excitation of a cantilever beam or a membrane at resonant frequency. These cooling systems therefore show high potential for the efficient and reliable cooling of linear drives in precision engineering. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach

关键词： Cooling systems

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Linear direct drive with inductive energy transmission 12

Linear direct drive with inductive energy transmission

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12. ETG/GMM-Fachtagung Innovative Small Drives and Micro-Motor Systems, IKMT 2019 - 12th ETG/GMM Symposium Innovative Small Drives and Micro-Motor Systems, IKMT 2019

作者： Mittag, Marcel Gundelsweiler, Bernd Institute of Design and Production in Precision Engineering University of Stuttgart Germany

ISBN: (纸本)9783800750634

Linear direct drives, which based on the electrodynamic operating principle, are designed with a moving coil or magnet system. The advantage of such a system with moving magnets is the unnecessity for current supply at the armature, while its disadvantage lies in the increased material and control effort caused by the coils in the stator. Those drives with a moving coil system have higher dynamics due to a lower moving mass, but in turn require the power supply to be carried along. Trailing cables, which also carry the cable for data transmission, are used for longer travel ranges. As an additional disturbance due to its length and weight, the trailing cable is a mechanical component, which limits the dynamics and positioning accuracy. It also increases the sensitivity to cable breakage. A moving coil system with inductive energy transmission makes the trailing cables superfluous and benefits from the higher dynamics as well as from the prevention of cable breakage. This paper presents a concept that enables a linear direct drive to be powered wirelessly. The energy transfer takes place inductively according to the transformer principle. As a coaxial transformer, an inductive coupling is established between a stationary primary coil and a moving secondary coil via a toroidal ferrite. This allows the armature with toroidal core and secondary coil without mechanical contact. The control and power electronics are mounted entirely on the armature. Creating a linear direct drive with a moving coil system, that can be operated without a trailing cable and with position control. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach

关键词： Position control

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