System design and comparison of calculated and measured performance of a bearing less BLDC-drive with axial flux path for an implantable blood pump

Horz, M.; Herzog, Hans-Georg; Medler, N.

doi:10.1109/speedam.2006.1649918

Cited by 5 publications

(6 citation statements)

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“…Unlike passive control, active axial control can precisely adjust the electromagnetic force to return the rotor to a balanced position . In this study, a compact magnetically levitated bearing with two concentric PM rings and a pair of coils, one on each side (PM‐Coil module) (Fig.…”

Section: Force Distribution and Design Criteriamentioning

confidence: 99%

“…In the design stage, the numerical finite element method (FEM) was used to evaluate the magnetic force of the brushless DC (BLDC) motor and optimize the fundamental geometry of the PM‐Coil module. However, substantial computation time is required to reconstruct the model each time certain design parameters are adjusted . To simplify the design process and reduce the time required for the FEM simulation, analytic expressions were developed for the magnetic forces that the rotor eccentricity of the BLDC motor was expected to produce.…”

Section: Force Distribution and Design Criteriamentioning

confidence: 99%

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Systematic Design of a Magnetically Levitated Brushless DC Motor for a Reversible Rotary Intra‐Aortic Blood Pump

et al. 2017

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The IntraVAD is a miniature intra-aortic ventricular assist device (VAD) designed to work in series with the compromised left ventricle. A reverse-rotation control (RRc) mode has been developed to increase myocardial perfusion and reduce ventricular volume. The RRc mode includes forward rotation in systole and reverse rotation in diastole, which requires the IntraVAD to periodically reverse its rotational direction in synchrony with the cardiac cycle. This periodic reversal leads to changes in pressure force over the impeller, which makes the entire system less stable. To eliminate the mechanical wear of a contact bearing and provide active control over the axial position of the rotor, a miniature magnetically levitated bearing (i.e., the PM-Coil module) composed of two concentric permanent magnetic (PM) rings and a pair of coils-one on each side-was proposed to provide passive radial and active axial rotor stabilization. In the early design stage, the numerical finite element method (FEM) was used to optimize the geometry of the brushless DC (BLDC) motor and the maglev module, but constructing a new model each time certain design parameters were adjusted required substantial computation time. Because the design criteria for the module had to be modified to account for the magnetic force produced by the motor and for the hemodynamic changes associated with pump operation, a simplified analytic expression was derived for the expected magnetic forces. Suitable bearings could then be designed capable of overcoming these forces without repeating the complicated FEM simulation for the motor. Using this method at the initial design stage can inform the design of the miniature maglev BLDC motor for the proposed pulsatile axial-flow VAD.

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Section: Force Distribution and Design Criteriamentioning

confidence: 99%

Section: Force Distribution and Design Criteriamentioning

confidence: 99%

Systematic Design of a Magnetically Levitated Brushless DC Motor for a Reversible Rotary Intra‐Aortic Blood Pump

et al. 2017

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“…ECHANICAL cardiac assistance in the form of Artificial Hearts (AH) and Left Ventricular Assist Devices (LVADs) has become very popular in recent years and has been suggested as therapeutic solution to Congestive Heart Failure (CHF) [1]- [3]. LVADs are mechanical pumps placed between left ventricle and aorta that take over the damaged ventricle [3].…”

Section: Introductionmentioning

confidence: 99%

“…LVADs are mechanical pumps placed between left ventricle and aorta that take over the damaged ventricle [3]. The main requirements for a blood pump are small size less than 30 mm in diameter and 60 mm in length, with a high rotational speed greater than 5000 rpm.…”

Section: Introductionmentioning

confidence: 99%

Novel design, optimization and realization of axial flux motor for implantable blood pump

Neethu¹,

Shinoy

Shajilal

2010

2010 Joint International Conference on Power Electronics, Drives and Energy Systems &Amp; 2010 Power India

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This paper describes the novel design and optimization of an axial flux motor for blood pump application. With the design objective of maximizing the motor efficiency, different topologies of AFPM machine has been examined. Halbach arrangement of rotor magnets and use of Soft Magnetic Composite (SMC) material for the stator core adds further advantages to the optimal motor design. The results of the 3D Finite element analysis for the novel motor have been shown.

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“…The demands for these pumps are no wear, no maintenance, no dust, no rotating seals, no lubricants, and etc. A magnetic suspension is one of the solutions for such demands (1) (2) .…”

Section: Introductionmentioning

confidence: 99%

A Case Study of Suspension Characteristics of a Bearingless Motor Supplied by Inverters Having Different Voltage and Current Ratings

Amada

Miyamoto

Enomoto

et al. 2009

JSDD

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A wide magnetic gap consequent-pole type bearingless motor has been developed. The wide magnetic gap makes it difficult to start up and suspend a shaft with reasonable suspension voltage and current. To provide high current, high voltage rating is demanded, although, high voltage causes bad influence on magnetic suspension. In this paper, the authors have investigated the start-up and rotational characteristics of a prototype bearingless machine driven by voltage source inverters having the rated voltage of 200V and 100V. When the rated voltage is not suitable, significant problems are occurred. The effectiveness of proper selection in the rated voltage is discussed. The result of this study shows that the 100V inverter is a better choice for the bearingless motor.

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System design and comparison of calculated and measured performance of a bearing less BLDC-drive with axial flux path for an implantable blood pump

Cited by 5 publications

References 0 publications

Systematic Design of a Magnetically Levitated Brushless DC Motor for a Reversible Rotary Intra‐Aortic Blood Pump

Systematic Design of a Magnetically Levitated Brushless DC Motor for a Reversible Rotary Intra‐Aortic Blood Pump

Novel design, optimization and realization of axial flux motor for implantable blood pump

A Case Study of Suspension Characteristics of a Bearingless Motor Supplied by Inverters Having Different Voltage and Current Ratings

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