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4 Design and function
• The electric motor for the series NEA is a
three-phase asynchronous motor (capaci-
tor included on the supply cable or in the
capacitor box).
The electric motor for the series NEG is
a three-phase asynchronous motor.
− To achieve a high rate of efficiency at a
low motor temperature, the stators of the
asynchronous motors are made of an
electrical steel sheet with a low dissipation
factor.
− A special quality feature is the stator,
which has been cast under vacuum
with resin. The dried resin bonds hous-
ing and stator together to form an in-
separable unit, which is robust and trop-
ical proof. From housing size 140 up-
wards the stators are trickle impregnat-
ed. This method also completely fills the
spaces between the individual windings
and achieves high mechanical reliabil-
ity.
− Motor protection by incorporated PTC-
thermistor 130°C; as standard from size
170 upwards (DIN 44081 and DIN 44082).
− Protection by housing "tD" for use in areas
with potentially explosive dust atmos-
phere.
• The motor shaft is made of heat-
treated alloyed steel.
• The special bearings are over-dimen-
sioned and designed for heavy loads
and high frequencies.
• All units are ideally suited for speed
control with frequency converters.
• The housings of the sizes 50 to 140
and 160 are made of an aluminum al-
loy.
• The housings of the sizes 150 and
170 to 210 are made of high-tensile
nodular cast iron.
• Due to powder coating the paint finish
is highly weather resistant as well as
resistant against abrasion, impacts and
a wide variety of chemicals.
Colour: traffic black.
• The unbalance masses are adjusta-
ble as follows:
type XS continuously adjustable
type XLs in steps of 20°
type XL by removable discs
• The covers of the unbalances are
made of stainless steel.
9
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