4-3
4-1 Installation Conditions
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
4
System Design
Connecting to Mechanical Systems
 For the allowable axial loads for motors,
refer to Characteristics on page 3-2. If an
axial load greater than that specified is
applied to a motor, it may reduce the limit of
the motor bearings and may break the motor
shaft.
 When connecting to a load, use couplings
that can sufficiently absorb mechanical
eccentricity and declination.
 For spur gears, an extremely large radial
load may be applied depending on the gear
precision. Use spur gears with a high degree
of precision (for example, JIS class 2:
normal line pitch error of 6 µm max. for a
pitch circle diameter of 50 mm).
 If the gear precision is not adequate, allow
backlash to ensure that no radial load is
placed on the motor shaft.
 When using bevel gears, a load is applied in
the thrust direction depending on the
structural precision, the gear precision, and
temperature changes. Provide appropriate
backlash or take other measures to ensure
that a thrust load larger than the specified
level is not applied.
 Do not put rubber packing on the flange
surface. If the flange is mounted with rubber
packing, the motor flange may crack under the tightening force.
 When connecting to a V-belt or timing belt, consult the manufacturer for belt selection and tension.
 A radial load twice as large as the belt tension will be placed on the motor shaft. Do not allow a
load that exceeds the allowable radial load to be placed on the motor shaft. If an excessive radial
load is applied, the motor shaft and bearings may be damaged.
 Set up a movable pulley in the middle of the motor shaft and the load shaft so that the belt tension
can be adjusted.
Water and Drip Resistance
 The protective structure for the motors is as follows:
Equivalent to IP67 (except for through-shaft parts)
Set a movable structure.
Bevel gear
Set a structure in which
the distance between
axes can be adjusted.
Backlash
Motor center line
Ball screw center line
Axial offset
Axial offset
Pulley
Belt
Tension
Tension adjustment (Set a movable structure.)
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