scholarly journals Design of a Superconducting Machine and its Cooling System for an Aeronautics Application

2020 ◽  
Author(s):  
Alexandre Colle ◽  
Thierry Lubin ◽  
Jean Leveque
Keyword(s):  
Electric Propulsion ◽  
Cooling System ◽  
High Temperature Superconductors ◽  
Cryogenic Cooling ◽  
Electrical Machines ◽  
High Magnetic Fields ◽  
High Power Density ◽  
Optimal Temperature ◽  
Recent Developments ◽  
Electrical Motors

The transition to electric propulsion aircraft requires electrical motors or generators with high power density. The “zero resistivity” of the superconducting materials could be used in electrical machines to produce high magnetic fields and reduce the use of heavy components such as the ferromagnetic parts. The discovery and recent developments in High Temperature Superconductors (HTS) technology make the superconducting machine a serious candidate in the future of aircraft. The design of a superconducting machine is strongly dependent on its electromagnetic and thermal behavior. In this paper, the design of a 50 kW superconducting aircraft generator is presented. The mass of the cryogenic cooling system is included into the design in order to optimize the entire superconducting system. The study shows that the optimal temperature which conduct to the lighter superconducting system depends on the power of the superconducting machine.

scholarly journals Cooling Technologies for High Power Density Electrical Machines for Aviation Applications

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4579 ◽  
Author(s):  
Wolf-Rüdiger Canders ◽  
Jan Hoffmann ◽  
Markus Henke
Keyword(s):  
Phase Change ◽  
High Power ◽  
Cooling System ◽  
Electrical Machines ◽  
Electrical Machine ◽  
Brayton Cycle ◽  
High Power Density ◽  
Cooling Fluid ◽  
Cooling Method ◽  
Alternative Approach

This paper is aimed at giving an overview of possible cooling technologies for electrical machines and their assessment for aviation applications, e.g., fan or propeller drives. The most important demand for aircraft is the minimization of the drive system weight comprising electrical machine, power electronics, and the cooling system. The potential of aluminum winding an overview about several cooling technologies with the Rankine or Brayton cycle or utilizing the phase change of the cooling fluid is given. As an alternative approach, the cooling structure inside the machine is studied. A very interesting potential was discovered with direct slot cooling (DSC) removing the heat where it is produced and, thus, simplifying the cooling system effort and its weight. Since it is one of the most promising approaches, this cooling method is studied in depth. Furthermore, it can also be combined with one of the cooling technologies discussed above.

The influence of machining parameters using cryogenic cooling system

2021 ◽  
Author(s):  
Arie Yudha Budiman ◽  
Amrifan Saladin Mohruni ◽  
Safian Sharif ◽  
Aneka Firdaus ◽  
Bima Satria Nugraha
Keyword(s):  
Cooling System ◽  
Cryogenic Cooling ◽  
Machining Parameters

Use of High-Temperature Superconductors in High Speed Electronic Switches with Current Gain

1987 ◽  
Vol 99 ◽  
Author(s):  
Bryan A. Biegel ◽  
R. Singh
Keyword(s):  
High Temperature ◽  
Josephson Junction ◽  
Resonant Tunneling ◽  
High Speed ◽  
High Temperature Superconductors ◽  
Semiconductor Devices ◽  
Proximity Effects ◽  
Current Gain ◽  
Recent Developments ◽  
Electronic Switches

ABSTRACTRecent developments in superconductivity have taken 77 K superconducting electronics from a dream to a likelihood. Rather than following the conventional path by developing Josephson junction-based devices, this paper discusses the unique possibilities of hybrid superconductor/semiconductor devices. The two devices discussed are a true three-terminal hybrid resonant tunneling transistor and the semiconductor-coupled Josephson junction. Also, a list is given of as yet uninvestigated issues concerning the new superconductors and their proximity effects with semiconductors -issues that are critical to the operation of these hybrid superconductor/semiconductor devices.

scholarly journals Investigation of Operational Efficiency using Stochastic Models for Electric propulsion in Ships

2020 ◽  
Vol 2 (2) ◽  
pp. 84-91
Author(s):  
Nayana
Keyword(s):  
Stochastic Models ◽  
Electric Propulsion ◽  
Operational Efficiency ◽  
Installation Space ◽  
Energy Output ◽  
Drive Trains ◽  
Recent Developments ◽  
Consumption Energy ◽  
Traction Equipment ◽  
Operational Processes

In various models of vehicle drive trains, issues such as improving electric propulsion reliability, environmental performance, and economic efficiency has been enabled by the recent developments in electric power engineering in terms of materials, equipment and technologies. The increasing requirements in ecological parameters, efficiency for fault tolerance and reliability, accurate selection of design features and type of electric propulsion drive as well as the limitations on the traction equipment weight and installation space are the important parameters for execution of the system approach. The automobile electric propulsion systems consisting of one or more traction motors and few generating elements and their operational efficiency are analysed by means of stochastic models. Aircrafts, hybrid cars, diesel-electric locomotives, arctic cargo ships and icebreakers are ideal platforms for implementation of the propulsion system. The load modes of traction electric motors, operational fuel consumption, energy output of thermal engines and several other probabilistic characters of operational processes and random factors that influence the simulation result accuracy cannot be evaluated using the deterministic approach.

scholarly journals Theoretical Vibration Analysis Regarding Excitation due to Elliptical Shaft Journals in Sleeve Bearings of Electrical Motors

2012 ◽  
Vol 2012 ◽  
pp. 1-19 ◽  
Author(s):  
Ulrich Werner
Keyword(s):  
Differential Equation ◽  
Mathematical Description ◽  
Vibration Analysis ◽  
Equation System ◽  
Electrical Machines ◽  
Differential Equation System ◽  
Kinematic Constraints ◽  
Linear Differential ◽  
Electrical Motors ◽  
Rotor Mass

This paper shows a theoretical vibration analysis regarding excitation due to elliptical shaft journals in sleeve bearings of electrical motors, based on a simplified rotordynamic model. It is shown that elliptical shaft journals lead to kinematic constraints regarding the movement of the shaft journals on the oil film of the sleeve bearings and therefore to an excitation of the rotordynamic system. The solution of the linear differential equation system leads to the mathematical description of the movement of the rotor mass, the shaft journals, and the sleeve bearing housings. Additionally the relative movements between the shaft journals and the bearing housings are deduced, as well as the bearing housing vibration velocities. The presented simplified rotordynamic model can also be applied to rotating machines, other than electrical machines. In this case, only the electromagnetic spring valuecmhas to be put to zero.

Small, modular and economically attractive fusion enabled by high temperature superconductors

2019 ◽  
Vol 377 (2141) ◽  
pp. 20180354 ◽  
Author(s):  
Dennis Whyte
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Fields ◽  
Current Density ◽  
High Temperature Superconductors ◽  
Fusion Energy ◽  
High Magnetic Fields ◽  
Operating Temperatures ◽  
The Magnetic Field ◽  
Game Changer

The advantages of high magnetic fields in tokamaks are reviewed, and why they are important in leading to more compact tokamaks. A brief explanation is given of what limits the magnetic field in a tokamak, and why high temperature superconductors (HTSs) are a game changer, not just because of their higher magnetic fields but also for reasons of higher current density and higher operating temperatures. An accelerated pathway to fusion energy is described, defined by the SPARC and ARC tokamak designs. This article is part of a discussion meeting issue ‘Fusion energy using tokamaks: can development be accelerated?’.

High Power-Density SiC Converter

2008 ◽  
Vol 600-603 ◽  
pp. 1223-1226 ◽  
Author(s):  
Shin Ichi Kinouchi ◽  
Hiroshi Nakatake ◽  
T. Kitamura ◽  
S. Azuma ◽  
S. Tominaga ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
Power Loss ◽  
Cooling System ◽  
High Power Density ◽  
Loss Reduction ◽  
Effective Volume ◽  
Similar Rating ◽  
Power Densities ◽  
System Volume

A compact SiC converter having power densities about 9 W/cm3 is designed and fabricated. It is confirmed that the converter operates in a thermally permissive range. The power loss of the module of the converter measured under motor operations is less than 50% of the similar-rating Si module loss. The shrink of the effective volume of DC-link capacitor is necessary to achieve the high power-density SiC converter, in addition to the decrease of the cooling system volume due to the loss reduction caused by SiC devices.

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