Magnetics Business & Technology - May/June 2021 - 17

FEATURE ARTICLE
The pods are driven by GE's MV7000 variable frequency drives
with a range from 2.5MW to 22MW for various types of vessels. They include advanced induction motor technology that
has demonstrated its robustness through a wide range of naval,
merchant marine and offshore applications.
The ability of the MV7000 drive to operate at very low frequency
allows the ship operator to apply very high motor torque to the
propellor at very low rpm when operating in heavy ice. Advanced induction motors are closely coupled to the MV7000
drive by optimizing the number of motor poles. A low resistance
squirrel cage motor design increases efficiency and power factor. GE experts are able to minimize unsymmetrical magnetic
attraction between the rotor and stator to essentially eliminate
rotor shaft deflection, making air gap integrity safer than synchronous motor technology.
The motor achieves excellent compactness/power
density and high efficiency
with its unique cooling
technology combined with
its advanced electromagnetics topology. These
advantages are innovatively captured by the system integration technology, to achieve extreme
inherent robustness and
ice-class capabilities.

Based in Levis, Quebec, Davie is Canada's only mega-yard with
50% of total capacity, able to build up to eight large, complex
ships simultaneously. An integrated build schedule and large
dry docks allow Davie to build the 150 metre Polar Icebreaker
while also undertaking the build of six Program Icebreakers
under the national shipbuilding strategy.
" We welcome GE to our Polar program, " said James Davies,
President and CEO of Davie Shipbuilding. " Their leadingedge propulsion system combined with decades of icebreaker
experience and electric and power system capabilities are
unsurpassed. Their inclusion also greatly strengthens Canada's
National Icebreaker Centre. Together, we can ensure the Polar
is stimulating the post-pandemic economy and protecting
Canada's Arctic interests into the far future. "
" We recognize the key role that the National Icebreaker Centre
can play in helping GE engage with Canadian industry, " said
Gagan Sood, CEO, Power Conversion Americas. Currently, as
Single Source Integrator of power and propulsion systems, we
are supporting various shipyards in the US and Canada. We
are seeking to bring this experience to the Polar program and
work with qualified Canadian suppliers to help drive economic
growth in Canada. "
For more info, see www.icebreakercentre.ca, www.davie.ca and
www.gepowerconversion.com.

GE's pods feature robust induction
motors

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May/June 2021 * Magnetics Business & Technology

http://www.davie.ca http://www.icebreakercentre.ca http://www.gepowerconversion.com http://www.audemars.com http://www.MagneticsMag.com

Magnetics Business & Technology - May/June 2021

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