NORD Drivesystems B1000 - Manual (Page 678)

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Input
Section
INPUT SECTION
G1000 – Subject to Change Without Notice
NEMA C-Face Motor Adapter
NEMA C-face motor adapters allow for easy installa-
tion and removal of industry standard C-face motors.
NEMA C-face motor adapters consist of a coupling and
an adapter housing that connects the motor to the
gear reducer. Gear units with NEMA C-face adapters
are commonly used where applications require special-
ized motors or the user wants to easily fi nd a replace-
ment motor if failure occurs. NORD also offers high
performance NEMA C-face motors and brakemotors,
that can be factory installed to the motor adapter.
NORD motor adapters deliver nearly 100% of the
torque generated by the motor and can be used from
-22ºF (-30ºC) to 212ºF (100ºC). Most motor adapters
have specially sealed bearings that are lubricated for
life. However, some larger adapters are supplied with
an automatic lubricator, which provides time released
grease to the outboard adapter bearing. The auto-
matic lubricator needs replacement after a specifi c
service interval, see page 675 for more details.
The maximum input power of a gear unit with a NEMA
C-face adapter is generally limited by the power rating
of the standard NEMA C-face motor size. The power
limit is indicated in the ratings table for a standard
4-pole 1750 rpm motor. In some cases the gearbox
limit (T2
max
) will be the limiting capacity. Both the
NEMA adapter limit and the gearbox torque limit must
be considered. If the speeds required exceed those in-
cluded in the performance and speed reduction tables
please contact NORD.
IEC Motor Adapter (example SK32 – IEC63)
IEC motor adapters allow for easy installation and re-
moval of industry standard IEC motors according to
DIN 42677. The IEC adapter is very similar to the NEMA
C-face adapter in construction. The maximum input
power is generally limited by the IEC motor size. For
ratings and dimensions, please consult NORDS’s metric
catalogs.
Vertical Motor Adapter Applications
Gear units with motors frame sizes 250TC (IEC160) and
larger, in a vertical up motor mounting position, NORD
recommends using an integral gearmotor instead of
a NEMA or IEC input adapter. If your application re-
quires this mounting position and a NEMA or IEC in-
put, please consult NORD. In vertical down motor
mounted applications it is recommended to shorten
the maintenance interval.
Couplings
Couplings are made with tough abrasion resistant
materials, which resist most chemicals and petroleum
products. They are electrically isolated (prevent metal
to metal contact) and require no lubrication or main-
tenance. Depending on the size of the C-face input,
NORD provides either a gear or jaw type coupling.
Gear Couplings
Gear couplings are used with 56C to 280TC adapters
and provide a compact space saving design. C-face
adapter input shafts have a machined male spline that
meshes with a molded nylon spline on the coupling.
This specially designed molded nylon sleeve that ex-
hibits high torsional stiffness, resulting in minimum
fi t-up backlash and reduced internal frictional losses.
Gear couplings lightweight design yields low inertia
and use blind assembly and slip together components
to make inspection easy without disassembly.
NORD incorporates two styles of gear couplings, the
“J” and “M” styles. The “J” style is one-piece couplings
consisting of a nylon sleeve and metal hub that are
fused together. The “M” style is a two-piece coupling
consisting of a separate nylon sleeve and metal hub.
Jaw Couplings
Jaw couplings are used with 320TC and larger adapters.
The cast iron jaw type couplings have a urethane “spi-
der” that provides smooth transmission of the motor
torque and has excellent shock and vibration dampen-
ing characteristics. A set screw on the coupling pro-
hibits axial movement along the motor shaft.