Eddy-Current Linear-Rotary Position Sensor for an Implantable Total Artificial Heart

Giuffrida, Rosario V.; Kolar, Johann W.; Bortis, Dominik

doi:10.1109/icems56177.2022.9982894

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…With the two building blocks of the LiRA designed and experimentally verified, future work targets the operation of the complete drive system with full linear-rotary closed-loop position control. This requires the design and implementation of an embedded control system combining the previously designed eddy-current sensors [22] with a dedicated power electronics supply and control unit. The complete drive system then provides the basis for further testing of the ShuttlePump in vitro, i.e., on a dedicated hydraulic test bench, in order to finally assess whether the proposed concept can overcome the limitations of currently available TAHs and feature significant improvements concerning hemocompatibility (low blood trauma), durability, and safety.…”

Section: Discussionmentioning

confidence: 99%

“…One possible workaround would be to choose a machine design with a large magnetic air gap (e.g., slotless), which, however, would require higher ohmic losses and/or a larger stator volume for the same torque output. Finally, another aspect to consider is that the chosen location for the linear-rotary position sensors will be on the two sides of the pump [22]. Due to their eddy-current-based operating principle, no conductive material besides the piston-embedded measurement target is allowed in close proximity.…”

Section: A Placement Of the Rotary Pms And Statorsmentioning

confidence: 99%

See 1 more Smart Citation

Spatially Highly Constrained Auxiliary Rotary Actuator for a Novel Total Artificial Heart

Giuffrida,

Senti,

Bortis

et al. 2023

IEEE Open J. Ind. Electron. Soc.

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In the context of a collaboration between the Medical University of Vienna, the Power Electronic Systems Laboratory of ETH Zurich, and Charité Berlin, the novel implantable total artificial heart (TAH) ShuttlePump is currently being developed. Its novel, low-complexity pumping concept requires a compact Linear-Rotary Actuator (LiRA). The Linear Actuator (LA) part was designed, realized, and experimentally verified in previous work, and it can provide a peak axial force of about 45 N with about 8 W of continuous power dissipation. This paper presents the details of the Rotary Actuator (RA) part. This has considerably lower output power requirements (about 100 mW) due to the low operating torque and angular speed (3.1 mNm and up to 300 rpm, respectively). However, the RA is highly constrained spatially, as it needs to be integrated very close to the previously realized LA. This forces a permanent magnet synchronous machine (PMSM) design with a rotor only partially equipped with PMs and stators covering only half of the total circumference, which introduces a considerable cogging component to the total torque. The proposed PMSM is hence optimized using Finite Element Methods (FEM) simulations to select a final design with low power losses and low cogging-induced angular speed ripple. The machine is realized as a hardware prototype, and the experimental measurements confirm that the proposed RA can meet the continuous torque requirement with 324 mW of power losses. The successful implementation of the RA (and LA) finally verifies the practical feasibility of the integrated LiRA and provides the basis for a comprehensive test of the complete ShuttlePump in a hydraulic test rig in the course of further research.

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Section: Discussionmentioning

confidence: 99%

Section: A Placement Of the Rotary Pms And Statorsmentioning

confidence: 99%

Spatially Highly Constrained Auxiliary Rotary Actuator for a Novel Total Artificial Heart

Giuffrida,

Senti,

Bortis

et al. 2023

IEEE Open J. Ind. Electron. Soc.

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“…To control the motion of the piston, it is necessary to complement the LiRA with linear-rotary position sensors. Their eddy-current-based design was already covered in previous work [18]. For completeness, further information is provided in the Appendix B.…”

Section: B Realized Lira and Linear-rotary Position Sensorsmentioning

confidence: 99%

“…The linear-rotary position sensors of the ShuttlePump are presented in previous work of the authors [18]. They are realized as PCB-embedded Eddy-Current Sensors (ECSs) and are placed in front of the two sides of the piston along the axial direction, as shown in Fig.…”

Section: B Realized Linear-rotary Position Sensorsmentioning

confidence: 99%

“…At the Power Electronic Systems Laboratory of ETH Zurich, the challenging task of defining an appropriate actuation and sensing concept, under the stringent requirements/constraints of the system (such as limited volume, mass and power losses) was tackled. This led to the design, realization and experimental verification of the compact PMSM-based Linear-Rotary Actuator (LiRA) [16], [17] and the integrated eddy-current-based linear-rotary position sensors [18]. This paper represents a point of arrival in the development of the complete ShuttlePump drive system.…”

Section: Introductionmentioning

confidence: 99%

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Linear-Rotary Position Control System With Enhanced Disturbance Rejection for a Novel Total Artificial Heart

Giuffrida,

Horat,

Bortis

et al. 2024

IEEE Open J. Ind. Electron. Soc.

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A novel implantable total artificial heart, hereinafter referred to as the ShuttlePump, is currently under development in a research collaboration between the Medical University of Vienna, the Power Electronic Systems Laboratory of ETH Zurich and Charite Berlin. Its novel, low-complexity, pulsatile pumping principle requires a specially-shaped piston performing a controlled, synchronized linear-rotary motion while providing the necessary hydraulic force and torque. The machine design of the PMSM-based linear-rotary actuator was conducted in previous work of the authors, leading to the construction of a hardware prototype satisfying the application requirements in terms of electromechanical force, torque, power losses and volume. This paper provides the details of the closed-loop linear-rotary position control system required to operate the ShuttlePump. The design of the position control system targets tight reference tracking (±8 mm linear stroke and continuous rotation) up to an operational frequency of 5 Hz, under the heavy disturbance introduced by the axial hydraulic load force, as high as 45 N. The experimental measurements show successful linear-rotary position tracking under the specified axial load, with a maximum error of 1 mm and 5 • .

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Design and Realization of a Highly Compact Tubular Linear Actuator for a Novel Total Artificial Heart

Giuffrida

Senti

Kolar

et al. 2023

IEEE J. Emerg. Sel. Top. Ind. Electron.

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Eddy-Current Linear-Rotary Position Sensor for an Implantable Total Artificial Heart

Cited by 3 publications

References 8 publications

Spatially Highly Constrained Auxiliary Rotary Actuator for a Novel Total Artificial Heart

Spatially Highly Constrained Auxiliary Rotary Actuator for a Novel Total Artificial Heart

Linear-Rotary Position Control System With Enhanced Disturbance Rejection for a Novel Total Artificial Heart

Design and Realization of a Highly Compact Tubular Linear Actuator for a Novel Total Artificial Heart

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