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Gradationally Controlled Voltage Inverter for More Electric Aircrafts

IHI Corporation-Hitoshi Oyori
Mitsubishi Electric Corp.-Tetsuya Kojima, Masahiro Sugahara, Yusuke Shirouchi, Hisatoshi Fukumoto, Akihiko Iwata
  • Technical Paper
  • 2019-01-1913
To be published on 2019-09-16 by SAE International in United States
Over recent decades, there has been a lot of progress toward a more electric aircraft (MEA) to reduce emissions and fuel consumption. In MEAs, many subsystems that previously used hydraulic or pneumatic power have been replaced by electrical systems with inverters and electrical machines. Therefore, MEAs reduce the weight, i.e. fuel consumption, and maintenance cost. To achieve advanced electrical systems, the weight of inverters has significant importance. In this work, a gradationally controlled voltage (GCV) inverter is proposed to reduce the weight and enhance reliability. A GCV inverter can supply gradational quasi-sinusoidal voltages combining two different voltages from a 3-phase 3-level (main) inverter and three single-phase H-bridge (sub) inverters. A dc power supply is required only for the main inverter. A main inverter with Si-IGBTs supplies the fundamental voltage by only one switching in the fundamental period. Consequently, the switching loss is minimized and hence the weight of cooling systems can be reduced. Sub inverters, which have the half of dc-link voltage of the main inverter, employ SiC-MOSFETs with higher switching frequency and compensate for…
 

Modelling of a Spark Ignition Engine with Turbo-Generator for Energy Recovery

Istituto Motori CNR -Napoli-Luigi De Simio, Sabato Iannaccone
NETCOM group -Napoli-Fabio Arminio
  • Technical Paper
  • 2019-24-0084
To be published on 2019-08-15 by SAE International in United States
Increasingly stringent regulations in the field of pollutant and CO2 are forcing engine manufacturers to adopt new solutions to contain exhaust emissions, such as Hybrid Electric Vehicles (HEV) or Full Electric Vehicles (FEV). Still far from the wide diffusion of FEV limited from electrochemical storage systems together with the difficulty of creating adequate infrastructure distributed throughout the territory to recharging batteries, at present HEVs seems to be a better solution. The hybrid vehicle is already able to guarantee satisfactory autonomy and low pollution levels by combining the advantages offered by the two technologies of thermal and electric propulsion. Currently on the market there are several types of hybrid vehicles, with different degree of hybridization (depending of the electric power of the motor generators installed), capacity to store electricity and type of scheme constructive adopted for the integration between the thermal engine and the electric machines. A particular interest is getting the mild-hybrid (or light hybridization) and the micro-hybrid (or minimum hybridization) with 48V electrical system added to the common 12V one. In this field, a…
 
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Rotary Electrical Contact

  • Magazine Article
  • TBMG-34620
Published 2019-06-01 by Tech Briefs Media Group in United States

Researchers have developed a fundamentally new type of rotary electrical contact that addresses the two limitations of conventional brush/slip ring technology: 1) short operating lifetime due to sliding-contact wear, and 2) electrical arcing associated with contact bounce.

 
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Standardized Symbols for Electrical Circuit Diagrams

Truck and Bus Electrical Systems Committee
  • Ground Vehicle Standard
  • J2221_201905
  • Current
Published 2019-05-16 by SAE International in United States
This SAE Recommended Practice identifies graphic symbols used in electrical circuit diagrams. The symbols aid troubleshooting electrical systems.
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CIRCUIT BREAKER - AIRCRAFT, TRIP-FREE, PUSH-PULL, 1/2 THRU 25 AMPS, TYPE 1 -55 THRU +121 °C

AE-8B Protective and Control Devices
  • Aerospace Standard
  • AS33201B
  • Current
Published 2019-04-25 by SAE International in United States
No Abstract Available.
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Aircraft Nosewheel Steering/Centering Systems

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • AIR1752A
  • Current
Published 2019-04-17 by SAE International in United States
The intent of this AIR is twofold: (1) to present descriptive summary of aircraft nosewheel steering and centering systems, and (2) to provide a discussion of problems encountered and “lessons learned” by various airplane manufacturers and users. This document covers both military aircraft (land-based and ship-based) and commercial aircraft. It is intended that the document be continually updated as new aircraft and/or new “lessons learned” become available.
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Insulation Sleeving, Electrical, Heat Shrinkable, General Specification for

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS23053A
  • Current
Published 2019-04-08 by SAE International in United States
This specification establishes the requirements for various types and colors of electrical insulating sleeving that will shrink to a predetermined size upon the application of heat. This specification includes provisions for demonstrating compliance with qualification requirements (see Section 4 and 7.3), in process inspection, and statistical process control inspections (see 4.4). The continuous operating temperature ranges for the sleeving classes covered by this specification are from -112 to +482 °F (-80 to +250 °C). The continuous operating temperature range for each sleeving class is given in the applicable detail specification.
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INSULATION SLEEVING, ELECTRICAL, HEAT SHRINKABLE, POLYVINYL CHLORIDE, SEMI RIGID, CROSSLINKED AND NON-CROSSLINKED

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS23053/3
  • Current
Published 2019-04-08 by SAE International in United States
No Abstract Available.
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INSULATION SLEEVING, ELECTRICAL, HEAT SHRINKABLE, FLAME RETARDED, MODIFIED POLYOLEFIN, FLEXIBLE, CROSSLINKED

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS23053/17
  • Current
Published 2019-04-08 by SAE International in United States
No Abstract Available.
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INSULATION SLEEVING, ELECTRICAL, HEAT SHRINKABLE, POLYVINYL CHLORIDE, SEMI RIGID, CROSSLINKED AND NON-CROSSLINKED

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS23053/2
  • Current
Published 2019-04-08 by SAE International in United States
No Abstract Available.
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