3-5
H
Connecting to Mechanical Systems
•
The axial loads for Servomotors are specified in
2-5-2 Performance Specifications
. If an axial load
greater than that specified is applied to a Servomo-
tor, it will reduce the service life of the motor bearings
and may damage the motor shaft. When connecting
to a load, use couplings that can sufficiently absorb
mechanical eccentricity and variation.
•
For spur gears, an extremely large radial load may
be applied depending on the gear precision. Use
spur gears with a high degree of accuracy (for exam-
ple, JIS class 2: normal line pitch error of 6
µ
m max.
for a pitch circle diameter of 50 mm). If the gear preci-
sion is not adequate, allow backlash to ensure that
no radial load is placed on the motor shaft.
•
Bevel gears will cause a load to be applied in the
thrust direction depending on the structural preci-
sion, the gear precision, and temperature changes.
Provide appropriate backlash or take other mea-
sures to ensure that no thrust load is applied which
exceeds specifications.
•
Do not put rubber packing on the flange surface. If
the flange is mounted with rubber packing, the motor
flange may separate due to the tightening strength.
•
When connecting to a V-belt or timing belt, consult the maker for belt selection and tension. A radial
load twice the belt tension will be placed on the motor shaft. Do not allow a radial load exceeding
specifications to be placed on the motor shaft due to belt tension. If an excessive radial load is
applied, the motor shaft may be damaged. Set up the structure so that the radial load can be
adjusted. A large radial load may also be applied as a result of belt vibration. Attach a brace and
adjust Servo Driver gain so that belt vibration is minimized.
Tension
Pulley for tension adjustment
(Make adjustable.)
Pulley
Belt
H
Connectors Conforming to EC Directives
The Power Cable and Encoder Cable connectors listed in the following table are recommended for con-
forming to EC Directives.
Note
The connectors for the Servomotor models not listed below, i.e., 3,000-r/min Servomotors (30 to
750 W) and all 3,000-r/min Flat-style Servomotor models, already conform to EC Directives and
do not need to be changed.
Ball screw center line
Servomotor shaft center
line
Shaft core displacement
Backlash
Adjust backlash by
adjusting the distance
between shafts.
Make moveable.
Bevel gear
System Design and Installation
Chapter 3
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