Design Method of Bearingless Permanent Magnet Slice Motor for Maglev Centrifugal Pump Based on Performance Metric Cluster

Zhang, Yifan; Hu, Liang; Su, Rui; Ruan, Xiangyan

doi:10.3390/act10070153

Cited by 7 publications

(8 citation statements)

References 31 publications

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“…A 3D model of the motor axial restoring force was used because the iron stator is composed of 12 discrete arms, and the interaction of these arms could not be modeled accurately using a simplified approach. 23 In contrast, a 2D FEA modeling approach for the motor torque was sufficiently robust to characterize the flux path and back iron thickness. 24 These flux density plots showed the distribution of magnetic flux following expected trends.…”

Section: Discussionmentioning

confidence: 99%

Next Generation Development of Hybrid Continuous Flow Pediatric Total Artificial Heart Technology: Design–Build–Test

Hirschhorn,

Lawley,

Roof

et al. 2023

ASAIO Journal

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To address the unmet clinical need for pediatric circulatory support, we are developing an operationally versatile, hybrid, continuous-flow, total artificial heart (“Dragon Heart”). This device integrates a magnetically levitated axial and centrifugal blood pump. Here, we utilized a validated axial flow pump, and we focused on the development of the centrifugal pump. A motor was integrated to drive the centrifugal pump, achieving 50% size reduction. The motor design was simulated by finite element analysis, and pump design improvement was attained by computational fluid dynamics. A prototype centrifugal pump was constructed from biocompatible 3D printed parts for the housing and machined metal parts for the drive system. Centrifugal prototype testing was conducted using water and then bovine blood. The fully combined device (i.e., axial pump nested inside of the centrifugal pump) was tested to ensure proper operation. We demonstrated the hydraulic performance of the two pumps operating in tandem, and we found that the centrifugal blood pump performance was not adversely impacted by the simultaneous operation of the axial blood pump. The current iteration of this design achieved a range of operation overlapping our target range. Future design iterations will further reduce size and incorporate complete and active magnetic levitation.

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Section: Discussionmentioning

confidence: 99%

Next Generation Development of Hybrid Continuous Flow Pediatric Total Artificial Heart Technology: Design–Build–Test

Hirschhorn,

Lawley,

Roof

et al. 2023

ASAIO Journal

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“…Some fields, such as aerospace, medical, self-driving, etc., will suffer huge losses and irreversible results upon software faults. 14 Previous studies identified negative designs based on Java static code metrics for most Android apps, as they are typically developed in Java/C++. 15,16 In essence, these studies still work for Android apps, but Android features distribute smells differently, 17 and some specific code smells are more frequent.…”

Section: Code Smell In Androidmentioning

confidence: 99%

Security‐based code smell definition, detection, and impact quantification in Android

Zhong,

Shi,

et al. 2023

Softw Pract Exp

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Android's high market share and extensive functionality make its security a significant concern. Research reveals that many security issues are caused by insecure coding practices. As a poor design indicator, code smell threatens the safety and quality assurance of Android applications (apps). Although previous works revealed specific problems associated with code smells, the field still lacks research reflecting Android features. Moreover, the cost and time limit developers to repairing numerous smells timely. We conducted a study, including Definition, Detection, and Impact Quantification for Android code smell (DefDIQ): (1) define 15 novel code smells in Android from a security programming perspective and provide suggestions on how to eliminate or mitigate them; (2) implement DACS (Detect Android Code Smell) to automatically detect the custom code smells based on ASTs; (3) investigate the correlation between individual smells with DACS detection results, select suitable code smells to construct fault counting models, then quantify their impact on quality, and thereby generating code smell repair priorities. We conducted experiments on 4575 open‐source apps, and the findings are: (i) Lin's CCC between DACS and manual detection results reaches 0.9994, verifying the validity; (ii) the fault counting model constructed by zero‐inflated negative binomial is superior to negative binomial (AIC = 517.32, BIC = 522.12); some smells do indicate fault‐proneness, and we identify such avoidable poor designs; (iii) different code smells have different levels of importance and the repair priorities constructed provide a practical guideline for researchers and inexperienced developers.

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“…Limited research has been carried out to determine the general relationship between specific geometric features and performance characteristics unique to BPMSMs. A notable exception is the study by Zhang et al where they demonstrate the impact of three different geometric features on a configuration's performance characteristics [24]. This study, however, only focuses on a two-phase configuration and does not offer a comparison to those with different amounts of phases.…”

Section: Introductionmentioning

confidence: 99%

Practical Comparison of Two- and Three-Phase Bearingless Permanent Magnet Slice Motors for Blood Pumps

Lawley,

Matlis,

Throckmorton

et al. 2024

Actuators

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The majority of bearingless permanent magnet slice motors (BPMSMs) used in commercially available rotary blood pumps use a two-phase configuration, but it is unclear as to whether or not a comparable three-phase configuration would offer a better performance. This study compares the performance of two-phase and three-phase BPMSM configurations. Initially, two nominal designs were manufactured and empirically tested for their performance characteristics, namely, the axial stiffness, radial stiffness, and current force. Subsequently, finite element analysis (FEA) models were developed based on these nominal devices and validated against the empirical results. Simulations were then employed to assess the sensitivity of performance characteristics to variations in seven different geometric features of the models for both configurations. Our findings indicate that the nominal three-phase design had a higher axial stiffness and radial stiffness, but resulted in a lower axial-to-radial-stiffness ratio when compared to the nominal two-phase design. Additionally, while the nominal two-phase design shows a higher current force, the nominal three-phase design proves to be slightly superior when the force generated is considered relative to the power usage. Notably, the three-phase configuration demonstrates a greater sensitivity to dimensional changes in the geometric features. We observed that alterations in the air gap and rotor length lead to the most significant variations in performance characteristics. Although most changes in specific geometric features entail equal tradeoffs, increasing the head protrusion positively influences the overall performance. Moreover, we illustrated the interdependent nature of the head height and rotor height on the performance characteristics. Overall, this study delineates the strengths and weaknesses of each configuration, while also providing general insights into the relationship between specific geometric features and performance characteristics of BPMSMs.

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Design Method of Bearingless Permanent Magnet Slice Motor for Maglev Centrifugal Pump Based on Performance Metric Cluster

Cited by 7 publications

References 31 publications

Next Generation Development of Hybrid Continuous Flow Pediatric Total Artificial Heart Technology: Design–Build–Test

Next Generation Development of Hybrid Continuous Flow Pediatric Total Artificial Heart Technology: Design–Build–Test

Security‐based code smell definition, detection, and impact quantification in Android

Practical Comparison of Two- and Three-Phase Bearingless Permanent Magnet Slice Motors for Blood Pumps

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