Magnetics Business & Technology - May/June 2023 - 21

FEATURE ARTICLE
Impermeable Stacking by Feintool Enables Integrated Cooling for Motors
trend is for motors not to be cooled externally, but to
have cooling integrated into the rotors and stators. This
particularly requires impermeable stacking, sealing and
surface bonding such as glulock MD provides, explains
Markus Lock head of engineering at Feintool. With this
advancement in its glulock technology, now it is possible
to place several glue dots on the sheet in such a way that
an almost full-surface bonding is ensured. Tests have
already confirmed the required tightness. The bonding on
the yoke and tooth ensures stability.
Tight, impermeable bonding of the stacks of electrical steel laminations
is critical to e-motor performance, says Feintool
Whether the power source is battery or fuel cell, the efficiency
and performance of motors are crucial in electromobility.
Critical factors in their design and production
include stability of the lamination stacks of electrical steel
and their impermeability to cooling fluid. Feintool says
that its glulock Multiple Dots bonding process promises
tight and stable electric motors, even in the hightemperature
range prevalent in today's e-motors. Based
in Switzerland, the company develops machinery and
processes for both the production of motor laminations
as well as fineblanking of bipolar plates for fuel cells.
Modern grades of thinner electrical sheet
help achieve increased motor efficiency,
leading to a trend towards bonding the laminates
to increase performance and reduce
energy losses in the motor. Compared to
conventional package types, Feintool's glulock
MD proves to be cost-effective, precise
in design and with significant improvements
in stack tolerances for parallelism, shape
accuracy, runout and length tolerance, says
the company.
In addition, the output power is increased
or, conversely, the motor size is reduced.
Noise generation and eddy current losses
are also reduced. Even the stacking of thin
sheets (0.1 mm) can be realized. Its glulock
HT (High temperature) is a continuation of
the series-proven gluing method. It improves
strength and media resistance and
enables increased temperature resistance
up to 180° C.
Sealing is one of the new challenges.
Further developments in electric motors
show that, along with the growing mechanical
and thermal requirements, their cooling
also has potential for optimization. The
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May/June 2023 * Magnetics Business & Technology 21
From its headquarters in
Lyss, the Feintool group
has advanced the technology
of fineblanking,
forming and electrolamination
stamping for processing
steel sheets for
more than 60 years. It
now operates 19 production
plans and technology
centers worldwide,
staffed by about 3,500
employees.
Fineblanking and transforming are
core competencies at Feintool
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Magnetics Business & Technology - May/June 2023

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