New structure of single-phase field excitation flux switching machine for high density air conditioner with segmental rotor

Various topologies of 3 phase and single phase Field Excitation Flux Switching Machines (FSMs) have been develop recently due to the advantages of veriable flux capability of DC Field Excitation coil located on the stator as well as robust single piece rotor structure suitable for high speed applications. However, the fundamantel principles of the develop machine with salient pole rotor, requires overlap winding between armature and FEC, creating the problems of high end coil, huge size of motor as well as high copper losses. Therefore, in this paper, a new topology of single phase segmented rotor FEFSM with 12S-6P configuration is presented with the advantage of non overlap armature and FEC windings, a smaller machine with low copper loss is designed. In this study, the principle of single phase 12S-6P with segmental is an investigated using 2D-FEA finite element analysis to validate the torque, speed and power characteristics. As conclusion, the proposed design is suitable for high density air-conditioner because 1kW power generated at 1.8Nm and the corresponding speed of 4977r/min.

Download Full-text

A TEM study of the influence of microstructure on the superplastic behavior of a U-5.8 wt.% Nb alloy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144310 ◽

1986 ◽

Vol 44 ◽

pp. 568-569

Author(s):

G. Mackiewicz Ludtka

Keyword(s):

Grain Size ◽

Heating Rate ◽

Phase Field ◽

Single Phase ◽

Superplastic Behavior ◽

Two Phase ◽

Single Phase Field

Historically, metals exhibit superplasticity only while forming in a two-phase field because a two-phase microstructure helps ensure a fine, stable grain size. In the U-5.8 Nb alloy, superplastici ty exists for up to 2 h in the single phase field (γ1) at 670°C. This is above the equilibrium monotectoid temperature of 647°C. Utilizing dilatometry, the superplastic (SP) U-5.8 Nb alloy requires superheating to 658°C to initiate the α+γ2 → γ1 transformation at a heating rate of 1.5°C/s. Hence, the U-5.8 Nb alloy exhibits an anomolous superplastic behavior.

Download Full-text

Modular Rotor Single Phase Field Excited Flux Switching Machine with Non-Overlapped Windings

Energies ◽

10.3390/en12081576 ◽

2019 ◽

Vol 12 (8) ◽

pp. 1576 ◽

Cited By ~ 3

Author(s):

Lutf Ur Rahman ◽

Faisal Khan ◽

Muhammad Afzal Khan ◽

Naseer Ahmad ◽

Hamid Ali Khan ◽

...

Keyword(s):

Phase Field ◽

Single Phase ◽

Dead Zone ◽

Optimization Technique ◽

Rotor Design ◽

Iron Losses ◽

Excitation Coil ◽

Electromagnetic Performance ◽

Copper Losses ◽

Single Phase Field

This paper aims to propose and compare three new structures of single-phase field excited flux switching machine for pedestal fan application. Conventional six-slot/three-pole salient rotor design has better performance in terms of torque, whilst also having a higher back-EMF and unbalanced electromagnetic forces. Due to the alignment position of the rotor pole with stator teeth, the salient rotor design could not generate torque (called dead zone torque). A new structure having sub-part rotor design has the capability to eliminate dead zone torque. Both the conventional eight-slot/four-pole sub-part rotor design and six-slot/three-pole salient rotor design have an overlapped winding arrangement between armature coil and field excitation coil that depicts high copper losses as well as results in increased size of motor. Additionally, a field excited flux switching machine with a salient structure of the rotor has high flux strength in the stator-core that has considerable impact on high iron losses. Therefore, a novel topology in terms of modular rotor of single-phase field excited flux switching machine with eight-slot/six-pole configuration is proposed, which enable non-overlap arrangement between armature coil and FEC winding that facilitates reduction in the copper losses. The proposed modular rotor design acquires reduced iron losses as well as reduced active rotor mass comparatively to conventional rotor design. It is very persuasive to analyze the range of speed for these rotors to avoid cracks and deformation, the maximum tensile strength (can be measured with principal stress in research) of the rotor analysis is conducted using JMAG. A deterministic optimization technique is implemented to enhance the electromagnetic performance of eight-slot/six-pole modular rotor design. The electromagnetic performance of the conventional sub-part rotor design, doubly salient rotor design, and proposed novel-modular rotor design is analyzed by 3D-finite element analysis (3D-FEA), including flux linkage, flux distribution, flux strength, back-EMF, cogging torque, torque characteristics, iron losses, and efficiency.

Download Full-text

Superconductivity in the (Nd,Ce,Ca)2Cuo4-Z System

MRS Proceedings ◽

10.1557/proc-169-161 ◽

1989 ◽

Vol 169 ◽

Author(s):

Takeshi Sakurai ◽

Toru Yamashita ◽

Sumio Ikegawa ◽

H. Yamauchi

Keyword(s):

Phase Field ◽

Carrier Density ◽

Single Phase ◽

Superconducting Transition ◽

X Ray ◽

Analysis Techniques ◽

Density Relationship ◽

Micro Analysis ◽

T Phase ◽

Single Phase Field

AbstractWe have controlled the carrier (electron) density in Nd2CuO2 of the T’ structure by introducing both Ce and Ca into the Nd‐sites, and studied the superconducting transition temperature versus carrier density relationship. The phase relations in the (Nd1‐x‐yCexCay)2CuO4‐z system were studied by means of powder X‐ray dirfractron and electron‐probe micro‐analysis techniques. For the phase diagram of the (Nd1‐x‐yCexCay)2CuO4‐z system, the single phase field of the T’ phase was established. Samples of the (Nd0.9‐yCe0.1Cay)2CuO4‐z system with compositions included in the single phase field were synthesized. The carrier density in these samples was varied by controlling the Ca content. The Hall effect and DC resistivity were measured to elucidate the relation between Tc and the carrier density.

Download Full-text

Clinopyroxene with Si < AlIV in the join CaFeAISiO6-CaTiAl2O6

Mineralogical Magazine ◽

10.1180/minmag.1980.043.331.05 ◽

1980 ◽

Vol 43 (331) ◽

pp. 851-856 ◽

Cited By ~ 5

Author(s):

Kosuke Onuma ◽

Masahide Akasaka

Keyword(s):

Solid Solution ◽

Solid Solutions ◽

Phase Field ◽

Single Phase ◽

Tetrahedral Sites ◽

Single Phase Field

SummaryUnusual clinopyroxenes were synthesized in the study of the join CaFeAlSiO6-CaTiAl2O6 in air at I atm. Clinopyroxene solid solution, hibonite solid solution, X-phase, perovskite, and corundum are present, and at subsolidus temperatures the clinopyroxene singlephase field extends up to about 19 wt% CaTiAl2O6. The CaTiAl2O6 component in the clinopyroxene however increases beyond the clinopyroxene single-phase field and attains 23 wt%. These clinopyroxene solid solutions are extremely poor in SiO2 and extremely rich in Al2O3, Fe2O3, and TiO2, and more than half of tetrahedral sites are occupied by AlIV, contravening the aluminium avoidance principle.

Download Full-text

Simulated and experimental investigation on discontinuous dynamic recrystallization of a near-α TA15 titanium alloy during isothermal hot compression in β single-phase field

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(14)63259-3 ◽

2014 ◽

Vol 24 (6) ◽

pp. 1819-1829 ◽

Cited By ~ 15

Author(s):

Chuan WU ◽

He YANG ◽

Hong-wei LI

Keyword(s):

Experimental Investigation ◽

Titanium Alloy ◽

Dynamic Recrystallization ◽

Phase Field ◽

Single Phase ◽

Hot Compression ◽

Ta15 Titanium Alloy ◽

Single Phase Field

Download Full-text

Deformation Behavior of a β-Solidifying TiAl Alloy within β Phase Field and Its Effect on the β→α Transformation

Metals ◽

10.3390/met8080605 ◽

2018 ◽

Vol 8 (8) ◽

pp. 605 ◽

Cited By ~ 2

Author(s):

Yi Chen ◽

Liang Cheng ◽

Guang Yang ◽

Yalin Lu ◽

Fengbo Han

Keyword(s):

Phase Field ◽

Deformation Behavior ◽

Single Phase ◽

Tial Alloy ◽

Volume Fraction ◽

Dislocation Creep ◽

Strain Rates ◽

Texture Intensity ◽

Β Phase ◽

Single Phase Field

In this study, the deformation behavior of a Ti-40Al-10V (at.%) alloy within β single phase field was examined by means of isothermal compression at 1300 °C under strain rates of 2 s−1, 0.2 s−1, and 0.02 s−1, as well as its effect on the subsequent β→α transformation. The results showed that the alloy behaved steady-state flow with dislocation creep as the predominant rate-controlling process. Dynamic recrystallization (DRX) evidently occurred during deformation, and its volume fraction was dramatically increased so that at the lowest strain rate (0.02 s−1), a full-DRX β structure was obtained. The preferentially dynamic migration of grain boundaries with <100> orientation was demonstrated to be the major DRX mechanism. The texture was characterized by a <100> + <111> double-fiber at 2 s−1, but gradually transformed into a simple rotated cube orientationunder 0.02 s−1, accompanied by a decreasing texture intensity. During the subsequent β→α transformation, two types of α morphology wereproduced with evident variant selection, namely, the Widmannstatten colony and martensitic laths. Texture simulation revealed that the α texture was solely determined by parent β texture, despite of the variant selections.

Download Full-text

Optimal design of single-phase 12S-6P FEFSM using segmental rotor and non-overlap windings

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v14.i2.pp735-743 ◽

2019 ◽

Vol 14 (2) ◽

pp. 735

Author(s):

Mohd Fairoz Omar ◽

Erwan Sulaiman ◽

Hassan Ali Soomro ◽

Faisal Amin ◽

Laili Iwani Jusoh ◽

...

Keyword(s):

Output Power ◽

High Speed ◽

Single Phase ◽

Flux Linkage ◽

Copper Loss ◽

High Torque ◽

Field Excitation ◽

Flux Path ◽

Rotor Structure ◽

Segmental Rotor

<span>Recently, a three-phase Field Excitation Flux Switching Motor (FEFSM) using salient rotor has been introduced, suitable for high torque, high power as well as high speed diverse performances due to their advantages of easy rotor temperature elimination and controllable field excitation (FE) flux. However, existing FEFSMs are found to have low torque performance as the salient rotor structure has caused longer flux path, and consequently weak flux linkage. Therefore, a new structure of a single-phase FEFSM using segmental rotor and non-overlap windings is proposed. There are two valuable findings found in this topology, first is less copper loss due to the non-overlap windings between armature and FE coils, and secondly the segmental rotor structure has produces shorter flux path to produce high torque, less rotor weight as well as robust rotor at high speed condition. Flux linkage, back-emf, average torque and output power characteristics of the initial and optimized designs have been investigated and compared using 2D Finite Element Analysis (2D-FEA) through JMAG Designer version 15. Based on the 2D-FEA analysis, the average torque has increased by 81.3% to 1.65 Nm, while the output power of 466.5 W, increased of 68.2%. In conclusions, a FEFSM using segmental rotor and non-overlap windings is considered as the best single-phase motor due to their optimal performances and less copper loss.</span>

Download Full-text