IEEE Electrification Magazine - June 2014 - 55

Jet Fuel
Thrust for Propulsion

Jet Engine

Generator Can Be Mounted to the
Shaft as Embedded Generator (or on
the Gearbox)

Generator

Power Converter (ac to dc)

Power Converter
Traditional
Aircraft
Electric Load

Power Converter

Electric De-icing
Galley Loads

Power Converter

Power Converter

Environment
Control System

Oil, Hydraulic,
and Fuel Pump
Motor

Power Converter

Other Access
Loads

Figure 5. A typical MEA system.

be mounted on both HP and lowpressure (LP) shafts, and the power
from both can be combined on the dc
side to obtain maximum power during the climb, cruise, and descent of
the aircraft.

Motor

Inverter

More electric engine

42-V Battery
dcdc Converter

12-V
Battery
Figure 6. The Honda Insight integrated starter generator system (K. Rajashekara, "Converging
technologies for electric/hybrid vehicles and More Electric Aircraft systems," in Proc. SAE Power
Systems Conf., Fort Worth, TX, Nov. 2-4, 2010, Paper No. 2010-01-1757).

129 ºC Ignition
150 ºC Alternator
Surface
Surface

Engine Compartment
Close to Engine 120 ºC

0º

38º

143º

The embedded generation system,
together with the use of electric
pumps, will lead to a More Electric
Engine (MEE) system. The MEE replaces the current hydraulic and pneumatic systems with electrical
systems. This results in a lighter, more
efficient, better performing, more reliable, and less costly engine that can
be more easily integrated into airframe systems. A typical MEE architecture is shown in Figure 8. An
electric machine with starter/generator capability is mounted on the HP
shaft of a two-spool engine, and a
generator is mounted on the LP shaft
of the engine. In addition, the oil, fuel,
and hydraulic pumps are driven electrically by their respective electric
motors. The LP and HP shaft-mounted
electric machines could be traditional
wound-field synchronous machines
or PM or switched-reluctance
machines. The motors driving the
pumps could be PM brushless dc
motors or induction machines. These
motors are controlled using pulsewidth modulated inverters. The 28 Vdc

Engine 140 ºC

11

-
0º

9

90º

Exhaust system 587 ºC

-11

Exterior-
Susceptible to
Splash, etc. 70 ºC

0º

Engine Oil 148 ºC
Transmission Oil 148 ºC
Road Surface 66 ºC

Figure 7. The automotive engine compartment thermal environment (K. Rajashekara, "Converging technologies for electric/hybrid vehicles and More Electric Aircraft systems," in Proc. SAE
Power Systems Conf., Fort Worth, TX, Nov. 2-4, 2010, Paper No. 2010-01-1757).

	

IEEE Electrific ation Magazine / j une 2 0 1 4

55



Table of Contents for the Digital Edition of IEEE Electrification Magazine - June 2014

IEEE Electrification Magazine - June 2014 - Cover1
IEEE Electrification Magazine - June 2014 - Cover2
IEEE Electrification Magazine - June 2014 - 1
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IEEE Electrification Magazine - June 2014 - Cover3
IEEE Electrification Magazine - June 2014 - Cover4
https://www.nxtbook.com/nxtbooks/pes/electrification_december2022
https://www.nxtbook.com/nxtbooks/pes/electrification_september2022
https://www.nxtbook.com/nxtbooks/pes/electrification_june2022
https://www.nxtbook.com/nxtbooks/pes/electrification_march2022
https://www.nxtbook.com/nxtbooks/pes/electrification_december2021
https://www.nxtbook.com/nxtbooks/pes/electrification_september2021
https://www.nxtbook.com/nxtbooks/pes/electrification_june2021
https://www.nxtbook.com/nxtbooks/pes/electrification_march2021
https://www.nxtbook.com/nxtbooks/pes/electrification_december2020
https://www.nxtbook.com/nxtbooks/pes/electrification_september2020
https://www.nxtbook.com/nxtbooks/pes/electrification_june2020
https://www.nxtbook.com/nxtbooks/pes/electrification_march2020
https://www.nxtbook.com/nxtbooks/pes/electrification_december2019
https://www.nxtbook.com/nxtbooks/pes/electrification_september2019
https://www.nxtbook.com/nxtbooks/pes/electrification_june2019
https://www.nxtbook.com/nxtbooks/pes/electrification_march2019
https://www.nxtbook.com/nxtbooks/pes/electrification_december2018
https://www.nxtbook.com/nxtbooks/pes/electrification_september2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2018
https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
https://www.nxtbook.com/nxtbooks/pes/electrification_september2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2017
https://www.nxtbook.com/nxtbooks/pes/electrification_june2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2016
https://www.nxtbook.com/nxtbooks/pes/electrification_september2016
https://www.nxtbook.com/nxtbooks/pes/electrification_december2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2016
https://www.nxtbook.com/nxtbooks/pes/electrification_march2015
https://www.nxtbook.com/nxtbooks/pes/electrification_june2015
https://www.nxtbook.com/nxtbooks/pes/electrification_september2015
https://www.nxtbook.com/nxtbooks/pes/electrification_march2014
https://www.nxtbook.com/nxtbooks/pes/electrification_june2014
https://www.nxtbook.com/nxtbooks/pes/electrification_september2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2013
https://www.nxtbook.com/nxtbooks/pes/electrification_september2013
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