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MDS-D-SVJ3/SPJ3 Series Instruction Manual
1-1 Installation of servomotor
1-1-7 Coupling with the load
There are several ways to couple the motor shaft and machine, such as direct coupling with flexible coupling
or rigid coupling, gear connection, timing belt connection, etc.
Summarized comparison is as follows.
(1) Direct coupling - Flexible coupling
When coupling the load directly, a flexible coupling is recommended. The benefits of a flexible coupling
are as below.
(a) Shaft's angle deviation and core deviation can be absorbed to some extent, so adjustment in motor
installation is easier.
However, in the case of single, shaft core deviation cannot be allowed, so it is required to design
and adjust so that the shaft cores of the motor and ball screw align. Check the specification of the
coupling to use. If the shaft core deviation exceeds the coupling's tolerable level, the motor will
have a broken shaft, or the bearing will have a shorter life. Thus, in order to simplify the installation
adjustment, use a double flexible coupling.
(b) Less looseness produces less vibration and less noise at the coupling part.
On the other hand, if assembling is loose, lower rigidity may be caused. When using a coupling with
lower rigidity, the accuracy in centering the core doesn't have to be high, however, it is undesirable
for servo. In order to fully utilize the servo's efficiency to ensure the maximum durability of the
equipments, it is required to use a highly rigid coupling, and to fully align the shaft cores in the initial
installation. It is also required to select the optimum flexible coupling according to the working
conditions, and use it correctly according to the manufacturer's specification manual.
Example of direct coupling with load
Noise
No
lubri-
cation
Back-
lash
Rigidity
Reliability
in coupling
Life
Torque
increased
at deceler-
ation
Degree of
freedom in
motor in-
stallation
Cautions in motor
installation
Direct coupling
with
flexible coupling
Looseness of bolt
Shaft core deviation
(In the case of single)
Direct coupling
with
rigid coupling
Looseness of bolt
Shaft core deviation
Angle deviation
Gear
Tooth chipping
Backlash too small
Pitch diameter too small
Timing belt
Belt is broken
Belt stretched too much
Pitch diameter too small
If the cautions in motor installation in the above table are not observed, the motor will have a broken
shaft, or the bearing will have a shorter life. Carry out design and installation adjustment so that the
load on the motor shaft will be below the tolerable loads mentioned in "1-1-5 Shaft characteristics".
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CAUTION
Load shaft
Spun ring
Flexible coupling
Motor shaft
Load shaft
Spun ring
Flexible coupling
Motor shaft
(a) Taper shaft
(b) Straight shaft