IEEE Electrification Magazine - June 2015 - 17

as maximum propulsion power, enabling the same
prime movers to be shared for propulsion and weapons
systems. Examples of high-power mission systems
include laser weapons (Figure 6), electromagnetic rail
guns (EMRGs) (Figure 7), electromagnetic launchers, electronic warfare systems, and high-power radars.
xx
IPSs reduce the number of prime movers. A typical IPS
configuration incorporates four to five prime movers as
part of generator sets. Equivalent nonintegrated configurations employing a mechanical drive and reduction
gears instead of propulsion motors would typically use
four prime movers for propulsion and three to five generator sets for electrical power generation (Figure 8).
The total reduction in prime movers can contribute to
Figure 6. The laser weapon system. (Photo courtesy of the
U.S. Navy.)
acquisition savings, reduced maintenance costs,
reduced volume required for intakes and uptakes, and
reduced manpower requirements.
xx
IPSs improve the efficiency of prime movers. Through
the integration of ship service electrical power and propulsion power, the overall system efficiency of an IPS
configuration can be considerably higher than that of an
equivalent mechanical drive design, particularly at low
speeds. The overall efficiency of a mechanical drive ship
suffers because the propulsion prime movers are inefficient when lightly loaded. Since the required propulsion
power is approximately proportional to the cube of
speed and ships seldom operate at maximum speed, the
required amount of propulsion power is significantly
less than the maximum propulsion power a vast majority of the time. With the introduction of integrated plants,
the ship service and propulsion loads are managed off
Figure 7. A test firing of an EMRG. (Photo courtesy of the U.S. Navy.)
the same distributed system, enabling more efficient
power management.
xx
IPSs improve the efficiency of propulsors. The integration of an IPS in
the design of a ship offers new
Ship Power
Propulsion
options for propulsion system
Gen
design. The propulsion-shaft line
Reduction
can be simplified with the removal
Power
Gear
Gen
Traditional
of the traditional controllable pitch
Conversion
Mechanical
and
propeller (CPP) system. CPPs are
Drive
Gen Distribution
currently the state of the practice
for major surface combatants in
Reduction
world navies because they enable
Gear
Gen
control of the ship's speed, both
Power
forward and reverse, when coupled
Conversion
Gen
with prime movers such as diesels
and
Distribution
and gas turbines that are not
Mtr
Gen
Integrated
MD
reversible and may have a miniPower
mum operating rotational speed.
System
Mtr
MD
Gen
As compared to fixed pitched propellers (FPPs), CPPs have a larger
hub to hold the apparatus for
adjusting pitch. This larger hub
reduces the efficiency of the CPP. Figure 8. A comparison of traditional mechanical drive and IPSs. MD: motor drive; Mtr: motor;
Since a propulsion motor is fully Gen: generator.
	

IEEE Electrific ation Magazine / j une 2 0 1 5

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Table of Contents for the Digital Edition of IEEE Electrification Magazine - June 2015

IEEE Electrification Magazine - June 2015 - Cover1
IEEE Electrification Magazine - June 2015 - Cover2
IEEE Electrification Magazine - June 2015 - 1
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IEEE Electrification Magazine - June 2015 - Cover3
IEEE Electrification Magazine - June 2015 - 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
https://www.nxtbookmedia.com