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Modular Multi-Mode Power Supplies
for Naval Power Systems
John Herbst, Joe Beno, Hamid Ouroua, Robert Hebner, Scott Pish, Jon Hahne
University of Texas at Austin Center for Electromechanics
ASNE Day 2015
March 3 – 5, 2015 Arlington, VA
Presentation Overview
• Rotating Electric Machines for Naval Applications
• Modular Multi-Mode Power Supplies (M3PS)
– Combat Hybrid Power Supply (CHPS)
– Compensated Pulsed Alternators
• Conclusions
Rotating Electric Machines
for Naval Applications
• Rotating electric machines are a critical element
of every naval vessel in service today
• Rotating electric machines address
a broad range of naval applications:
– Simple electric motor driven loads
– Prime/auxiliary power generation
• Emerging high speed generation
– Propulsion
• Induction, WF synchronous, PM
– EMALS pulsed power system
• Specialized rotating electric machines are already
an important part of the US Navy’s toolbox
– Providing robust, reliable solutions for critical mission loads
M3PS Concept
• Modular system of high performance rotating
electric machines combining inertial energy storage
with continuous and pulsed power capabilities
– Builds on successful EMALS concept
• Provide stand-alone solutions or can be integrated
into hybrid systems as part of an Energy Magazine
– Scalable systems to meet range of applications
• Fully integrated topology to maximize energy and
power density
Flywheel Topologies
Non-Integrated Topology
• Larger than other topologies, but
may have most simple assembly
• Maximum use of conventional M/G
systems and technology
• Flexible / adaptive design
• Power generation outside of vacuum
• Requires shaft seal and coupling
Partially-Integrated Topology
Fully-Integrated Topology
• Smaller and more efficient than nonintegrated
• Good use of available M/G technology,
but integration required
• Good design adaptability
• Favors use of PM generator
• Heat generation on rotor requires
careful engineering
• Most compact system
• Special purpose flywheel system
• Favors use of PM generator
• Heat generation on rotor requires
special engineering
• Rotating magnets at large radius
• Uses arbor or magnetic bearings to
match rotor growth
Combat Hybrid Power Supply
Combat Hybrid Propulsion System (CHPS)
• Dual use flywheel energy storage
– “Inside-out” arbor-less technology
– Continuous duty and pulse loads for
offensive and defensive systems
– Rotor assembly and material property
matching key for life requirements
• Demonstrated
Combat Hybrid Power Systems (CHPS) Flywheel
5-10 MW (peak), 4.5 MW (cont.), 7 kW-h
– Assembly of multi-pole magnetic rotor
– Assembly of full scale, liquid cooled stator
– Static torque, voltage, and cooling testing
– Full scale magnetic bearing under static load
with simulated rotor growth
S 3911.0009
S 3911.0235
CHPS-A Machine
CHPS-A Performance
• Add composite rings to increase energy storage
• Upgrade design for higher peak/continuous power
Complete CHPS Flywheel System
Lab Bearing
Lab Safety
CHPS-N Characteristics (evolving)
 Multifunction machine
Services multiple loads that require intermittent electric power
Dark start
Power quality improvement
 Small size
Fits through a 26”- diameter hatch
 Advanced technologies for performance enhancement
High speed machine technology
Advanced composite banding
Innovative heat transfer techniques
Novel bearings
Shock load mitigation
Advanced materials
Low loss / High temperature
Compensated Pulsed Alternators
Compensated Pulsed Alternators
• Conceived at University of Texas in late ’70s
– Original application was laser power supply for Lawrence
Livermore inertial confinement fusion program
• Wound field synchronous generator with
compensating windings or eddy current shields
– Low impedance
– High airgap flux densities
– Gigawatts for milliseconds
Megamp Output
Current Pulses
• Capable of directly driving large pulsed loads
– Demonstrated synchronized discharge of parallel machines
Armature Compensation
• Use image currents in compensating winding or
conductive eddy current shield to contain magnetic
fields from armature output currents
– Minimizes internal impedance
• Multiple topologies and compensation techniques
– Iron core, air core, rotating field, rotating armature,
single- or multiphase
– Active, passive, selective passive
– External excitation or self excitation
Compensation Techniques
• Active compensation features a compensating
winding in series with the armature winding
– Sharp pulse with fast rise time
• Passive compensation uses a conductive eddy
current shield
– Essentially sinusoidal output pulse
• Selective passive compensation uses a shorted
compensating winding rotated azimuthally
relative to the main armature winding
– Can be tailored for a variety of output pulse shapes
PA Development History
Latest PA Designs
• Latest PA designs are air core
machines without compensation
– Highest power density
• Self-excited system
– “Seed” current injected into
rotating field winding
– Resultant armature output is
rectified and fed back onto the
field winding
– Armature output is switched into
load when peak field current is
2004 Internal Design Study
Additional PA Benefits
• System can be designed to
minimize transient loading on
ship power system
– Take advantage of operation over
wide speed range to buffer supply
• System stores energy for
multiple high energy pulses
• Stored energy available to
support other transient loads or
to provide active filtering
Technology Comparison
12 MJ Capacitor Bank
22 MJ
480 MJ
• Rotating electric machines are already being used to
address critical mission loads for the US Navy
• Modular Multi-Mode Power Supplies (M3PS) are a
family of advanced rotating machines that can
effectively address a wide range of Navy applications
• M3PS concepts offer improved energy & power
density relative to alternative pulsed power systems
• M3PS concepts can also provide additional support
for the ship power system when not being used for
their primary mission load