Composition of a magnetic‐bearing system for horizontal shaft and its experimental results

Matsumura, Fumio; Takai, Yoshimi; Kido, Mamoru; Akiyama, Yuji

doi:10.1002/eej.4391030516

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…According to the partial vertical section of the Bi‐Sb‐Te ternary phase diagram shown in Figure 5d, the composition of the liquid phase between 693 K (420 °C) and 743 K (470 °C) should vary along the red curve. [ 51–53 ] Because the extruded liquid eutectic phase was Te‐rich, small regions inside the solid sample could have been Sb‐rich.…”

Section: Resultsmentioning

confidence: 99%

Thermoelectric Performance Enhancement in BiSbTe Alloy by Microstructure Modulation via Cyclic Spark Plasma Sintering with Liquid Phase

Zhuang

Pei

Cai

et al. 2021

Adv Funct Materials

112

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The widespread application of thermoelectric (TE) technology demands high‐performance materials, which has stimulated unceasing efforts devoted to the performance enhancement of Bi2Te3‐based commercialized thermoelectric materials. This study highlights the importance of the synthesis process for high‐performance achievement and demonstrates that the enhancement of the thermoelectric performance of (Bi,Sb)2Te3 can be achieved by applying cyclic spark plasma sintering to BixSb2–xTe3‐Te above its eutectic temperature. This facile process results in a unique microstructure characterized by the growth of grains and plentiful nanostructures. The enlarged grains lead to high charge carrier mobility that boosts the power factor. The abundant dislocations originating from the plastic deformation during cyclic liquid phase sintering and the pinning effect by the Sb‐rich nano‐precipitates result in low lattice thermal conductivity. Therefore, a high ZT value of over 1.46 is achieved, which is 50% higher than conventionally spark‐plasma‐sintered (Bi,Sb)2Te3. The proposed cyclic spark plasma liquid phase sintering process for TE performance enhancement is validated by the representative (Bi,Sb)2Te3 thermoelectric alloy and is applicable for other telluride‐based materials.

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Section: Resultsmentioning

confidence: 99%

Thermoelectric Performance Enhancement in BiSbTe Alloy by Microstructure Modulation via Cyclic Spark Plasma Sintering with Liquid Phase

Zhuang

Pei

Cai

et al. 2021

Adv Funct Materials

112

View full text Add to dashboard Cite

show abstract

“…This observation has been proven theoretically by Aoyama and Okazaki (21), Matsumura et al. (22), and experimentally by Williams et al. (23).…”

Section: Radial Experimental Parameter Estimation Of Hmbsmentioning

confidence: 54%

“…From the design point of view, it is very crucial to predict accurately the dynamic response of the magnetically supported system using the AMB support data. Hence, the theoretical frequency‐dependent controller's transfer function has been used in simulation or experimentally to obtain the stiffness and damping coefficients of magnetic bearings (21–23). However, this method excludes the system lags due to the digital signal processing (DSP), amplifiers, feedback sensor, actuator's cross‐axis capabilities, and electromagnetic losses (24,25).…”

mentioning

confidence: 99%

Parameter Estimation and Actuator Characteristics of Hybrid Magnetic Bearings for Axial Flow Blood Pump Applications

Lim¹,

Cheng²,

Chua³

2009

Artificial Organs

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Axial flow blood pumps are generally smaller as compared to centrifugal pumps. This is very beneficial because they can provide better anatomical fit in the chest cavity, as well as lower the risk of infection. This article discusses the design, levitated responses, and parameter estimation of the dynamic characteristics of a compact hybrid magnetic bearing (HMB) system for axial flow blood pump applications. The rotor/impeller of the pump is driven by a three-phase permanent magnet brushless and sensorless motor. It is levitated by two HMBs at both ends in five degree of freedom with proportional-integral-derivative controllers, among which four radial directions are actively controlled and one axial direction is passively controlled. The frequency domain parameter estimation technique with statistical analysis is adopted to validate the stiffness and damping coefficients of the HMB system. A specially designed test rig facilitated the estimation of the bearing's coefficients in air-in both the radial and axial directions. Experimental estimation showed that the dynamic characteristics of the HMB system are dominated by the frequency-dependent stiffness coefficients. By injecting a multifrequency excitation force signal onto the rotor through the HMBs, it is noticed in the experimental results the maximum displacement linear operating range is 20% of the static eccentricity with respect to the rotor and stator gap clearance. The actuator gain was also successfully calibrated and may potentially extend the parameter estimation technique developed in the study of identification and monitoring of the pump's dynamic properties under normal operating conditions with fluid.

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Design and parameter estimation of hybrid magnetic bearings for blood pump applications

Lim¹,

Zhang²,

Yang³

et al. 2009

Mechanical Systems and Signal Processing

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Composition of a magnetic‐bearing system for horizontal shaft and its experimental results

Cited by 9 publications

References 2 publications

Thermoelectric Performance Enhancement in BiSbTe Alloy by Microstructure Modulation via Cyclic Spark Plasma Sintering with Liquid Phase

Thermoelectric Performance Enhancement in BiSbTe Alloy by Microstructure Modulation via Cyclic Spark Plasma Sintering with Liquid Phase

Parameter Estimation and Actuator Characteristics of Hybrid Magnetic Bearings for Axial Flow Blood Pump Applications

Design and parameter estimation of hybrid magnetic bearings for blood pump applications

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