Thermal Model for the AC Armature Winding of a High Temperature Superconductor Airborne Motor

2005 ◽  
Author(s):  
A. M. Morega ◽  
J. C. Ordonez ◽  
J. V. C. Vargas
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Temperature Superconductor ◽  
Variable Magnetic Field ◽  
Thermal Design ◽  
Magnetic Field Effects ◽  
Electromagnetic Design ◽  
Circuit Simulator ◽  
Low Weight ◽  
Preliminary Study

This paper describes a preliminary study on a cooling concept for an airborne high performance synchronous motor that has a High Temperature Superconductor (HTS) field winding: whereas the rotor is actually an HTS DC field winding, the armature is an AC copper winding, mounted in an iron-less stator — a so-called “air winding”. The efforts aimed at prototyping a low weight/volume motor lead to a dedicated thermal design where an important role is played by the thermal management of the AC winding, which is the siege of intense power dissipation by Joule and variable magnetic field effects. The analysis reveals thermal constraints that are overlooked by the initial, first stage electromagnetic design and that need to be addressed. The thermal analysis reported here is based on equivalent, lumped thermal circuits: (a) a simplified circuit, aimed at delivering fast, design class results, that may be solved analytically; (b) more complex schemes aimed at assessing variable regimes, which are solved numerically by a circuit simulator. Both approaches are valuable, and complement each other in the quest for a meaningful preliminary design.

A Higher Resolution, Local Thermal Analysis of an AC Armature Winding of a High Temperature Superconductor Motor

2006 ◽  
Author(s):  
A. M. Morega ◽  
J. C. Ordonez
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
Variable Magnetic Field ◽  
Thermal Design ◽  
Field Analysis ◽  
Local Analysis ◽  
Magnetic Field Effects ◽  
Thermal Circuit ◽  
Standard Design

The armature of high performance synchronous motors with High Temperature Superconductor (HTS) field is an AC copper winding, mounted in an iron-less stator – a so-called "air winding". Its thermal design poses difficult problems because while the armature works at ambient temperatures it is siege of higher than usual power dissipation by Joule and variable magnetic field effects. Considering that air windings are not common in classical electrical machines design, novel cooling solutions need to be considered. The standard, design class lumped thermal circuit analysis may not suffice, and it has to be complemented with a finer resolution investigation of the regions with increased structural and heat transfer complexity. As a detailed, field analysis of the entire armature is not practical a local analysis is both desirable and feasible. This paper reports a mathematical model for the heat flow in a critical part of the air-winding armature of a forced convection air-cooled HTS motor. The heat transfer mechanisms and paths, the thermal load structure unveiled by numerical simulation are then used to produce a high resolution lumped thermal circuit that conveniently complements the design class schemes used for sizing models and prototypes.

Viewpoint on the manuscript by Zachary S. Hartwig et al “VIPER: An industrially scalable high current, high temperature superconductor cable” 2020 Supercond. Sci. Technol. 33

2021 ◽  
Author(s):  
Michael Parizh
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Temperature Superconductor ◽  
High Current ◽  
A Current

Abstract HTS tokamak SPARC is under development by the team lead by CFS, Cambridge, MA. The magnet will have toroidal coils operating at 20 T at a current in the 25 to 40 kA range. The ViewPoint describes VIPER, an advanced TSTC-based HTS cable that has a potential to meet all the criteria required for the HTS tokamak. If proven to be successful, the cable approach promises long lengths, hundreds of meters, of the high-performance cable with predictable and repeatable properties.

Metalorganic Deposition of YBCO Films for Second-Generation High-Temperature Superconductor Wires

MRS Bulletin ◽  
2004 ◽  
Vol 29 (8) ◽  
pp. 572-578 ◽  
Author(s):  
Martin W. Rupich ◽  
Darren T. Verebelyi ◽  
Wei Zhang ◽  
Thomas Kodenkandath ◽  
Xiaoping Li
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Temperature Superconductor ◽  
Second Generation ◽  
Ybco Film ◽  
Low Cost ◽  
High Rate ◽  
Ybco Films ◽  
Metalorganic Deposition ◽  
Film Fabrication

AbstractMetalorganic deposition (MOD) is an attractive process for low-cost, high-rate deposition of YBa2Cu3O7– (YBCO) films on continuous lengths of biaxially textured metallic templates for second-generation (2G) high-temperature superconductor (HTS) wires.MOD of YBCO films involves four steps:precursor synthesis, coating, decomposition, and reaction.The final films must meet stringent requirements, including high critical current, uniformity across the width and along the length of the textured substrate, and excellent mechanical properties.Achieving these properties has required the development of a metalorganic precursor that produces an intermediate BaF2-based film, which in turn is converted to a high-quality YBCO film.Understanding and controlling the deposition of the metalorganic precursor and its conversion to YBCO are critical to reproducibly manufacturing uniform, high-performance, HTS wires required for commercial applications.This article reviews the issues that must be addressed in the use of MOD for low-cost YBCO film fabrication and summarizes the performance of 2G HTS wires prepared by this manufacturing process.

ARMCO PH 13-8Mo

Alloy Digest ◽  
1990 ◽  
Vol 39 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
High Performance ◽  
High Strength ◽  
Heat Treating ◽  
Temperature Performance

Abstract ARMCO PH 13-8Mo is designed for high-performance applications requiring high strength coupled with excellent resistance to corrosion and stress corrosion. It has excellent toughness, good transverse properties and excellent forgeability. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-224. Producer or source: Baltimore Specialty Steels Corporation. Originally published May 1969, revised February 1990.

INCOLOY ALLOY 864

Alloy Digest ◽  
1998 ◽  
Vol 47 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Mechanical Strength ◽  
High Performance ◽  
Exhaust System ◽  
Good Combination ◽  
Fatigue Properties ◽  
Temperature Performance ◽  
Incoloy Alloy ◽  
Oxidation And Corrosion

Abstract Incoloy Alloy 864 is a high performance alloy developed specifically for automotive exhaust system flexible couplings and other exhaust applications. The alloy has a good combination of oxidation and corrosion resistance, with good mechanical strength, stability, and fatigue properties. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on high temperature performance and corrosion resistance as well as joining. Filing Code: SS-708. Producer or source: Inco Alloys International Inc.

HITACHI METALS SLD-MAGIC

Alloy Digest ◽  
2020 ◽  
Vol 69 (10) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Tool Steel ◽  
High Performance ◽  
Cold Work ◽  
Heat Treating ◽  
Temperature Performance ◽  
Mold Fabrication ◽  
Cold Work Tool Steel

Abstract Hitachi Metals SLD-Magic is a high-performance alloy cold-work tool steel that is characterized by improved mold lifespan and easy mold fabrication. This datasheet provides information on composition, physical properties, hardness, elasticity as well as fatigue. It also includes information on low and high temperature performance as well as heat treating, machining, and joining. Filing Code: TS-802. Producer or source: Hitachi Metals Ltd.

Use of activated carbon to remove undesirable residual amylase from refinery streams

2017 ◽  
pp. 96-103 ◽  
Author(s):  
Gillian Eggleston ◽  
Isabel Lima ◽  
Emmanuel Sarir ◽  
Jack Thompson ◽  
John Zatlokovicz ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Temperature ◽  
High Performance ◽  
Activated Carbons ◽  
Amylase Activity ◽  
Sugar Industry ◽  
End User ◽  
Customer Complaints ◽  
Carry Over ◽  
Very High

In recent years, there has been increased world-wide concern over residual (carry-over) activity of mostly high temperature (HT) and very high temperature (VHT) stable amylases in white, refined sugars from refineries to various food and end-user industries. HT and VHT stable amylases were developed for much larger markets than the sugar industry with harsher processing conditions. There is an urgent need in the sugar industry to be able to remove or inactivate residual, active amylases either in factory or refinery streams or both. A survey of refineries that used amylase and had activated carbon systems for decolorizing, revealed they did not have any customer complaints for residual amylase. The use of high performance activated carbons to remove residual amylase activity was investigated using a Phadebas® method created for the sugar industry to measure residual amylase in syrups. Ability to remove residual amylase protein was dependent on the surface area of the powdered activated carbons as well as mixing (retention) time. The activated carbon also had the additional benefit of removing color and insoluble starch.

Mechanism-Based Design for High-Temperature, High-Performance Composites. Book 1

1997 ◽  
Author(s):  
Anthony G. Evans ◽  
Frederick A. Leckie ◽  
J. W. Hutchinson
Keyword(s):  
High Temperature ◽  
High Performance
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