Magnetics Business & Technology - May/June 2021 - 27

PRODUCT NEWS

New Magnetic Domain Control Metal from Hitachi Can Boost Transformer Efficiency
mass production and applying it to Metglas, it has solved this
issue that has plagued the industry for many years.
The company began supplying samples in March and mass
production is planned to start in the first half of 2020 at the company's Metglas Yasugi Works in Japan.
For more info, see www.hitachi-metals.co.jp.

Hitachi Metals has developed a new magnetic
amorphous metal using its Metglas iron-based
amorphous alloy and magnetic domain control
technology that promises to bring dramatically
higher efficiency to distribution transformers. The
material has been named MaDC-A, an acronym
for magnetic domain controlled. The new metal
has a high flux density and approximately 25%
lower core loss than conventional core materials,
says the company.
In recent years, there has been a growing
demand to cut carbon dioxide emissions as a
countermeasure against global warming, creating
a pressing need for energy saving. The energy
efficiency standards for distribution transformers
are becoming stricter in many countries, and, to
comply with those standards, the development
of metal core materials with a lower core loss is
beneficial.
The lack of a crystalline structure in the amorphous alloy causes it to have low hysteresis loss,
which is energy loss that does not depend on the
frequency generated when a magnetic field is applied to the core.
Additionally, its thinness and high electrical resistivity create a characteristically low eddy-current
loss, which is energy loss that occurs due to the
eddy current generated when a DC magnetic field
is applied to the core. The outcome, says Hitachi,
is that a transformer made with it exhibits lower
core loss than from magnetic steel sheets, commonly known as electrical steel or silicon steel,
which are made of iron and silicon materials.
For over 20 years it has been recognized that
core loss can be reduced by controlling magnetic
domain structure, which is an area where a collection of minute magnets that exist in a ferromagnet
is aligned in one direction. However, technologies
that can be adapted for mass production have not
been established.
Hitachi says that by developing a magnetic domain structure control technology that adapts to

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