Tsubaki ECHT-FLEX NEF130W, Manual

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EMER-FLEX
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4. Precautions for Connecting a Servo Motor Drive System
Depending on the natural frequency and electric control status of the system as a whole, a ball screw drive system using a servo motor may generate
large vibration or abnormal sound caused by oscillation due to the characteristics of the servo motor. In this case, adjust the torsional stiffness and
moment of inertia of the overall drive system to increase the torsional natural frequency, or adjust the servo gain with the electric control tuning
function of the servo motor.
5. Select the EMER-FLEX Coupling that Meets the above Requirements, 1 through 4, from the
Transmission Capacity Table.
A Spacer Mounted with a Balance weight
Balance weight
Dynamic Balance Adjustment
Normally, because EMER-FLEX couplings provide a well-balanced design, they need no particular balance adjustment. However, when the coupling
is used at a high rotation speed, or when a long spacer is used, balance adjustment may be required.
In this case, inform us of your desired operating rotation speed, JIS balance rating, dimension
“ J ” , or spacer length so that we can perform your
balance adjustment.
For dynamic balance adjustment, we use the following two methods:
1) Drilling the spacer flange end face, and
2) Mounting a balance weight to the spacer pipe periphery. (The spacer with a balance weight is shown below. The balance weight mounting position
and quantity vary depending on operating conditions. Be careful not to interfere with the balance weight during rotation.)
When requesting a balance adjustment, specify either method 1) or 2) above.
Notes for Large Distance between Shaft
Ends
For large distance between shaft ends, Tsubaki offers a Long Spacer
Type that can be used in a floating state without the need for an
intermediate shaft bearing. We recommend this type of coupling if it fits
your application needs.
If the distance between shafts is short and an intermediate shaft is used
in a floating condition, be sure to use the Single-Type coupling.
If an intermediate shaft bearing is being used instead of the Long Spacer
Type coupling for reasons of convenience, fasten the intermediate shaft
with a bearing to prevent the intermediate shaft from floating. In this
case, it is recommended that the Spacer-Type disk coupling be used.
Never use the Spacer-Type coupling under such conditions; it is very
dangerous due to the marked floating tendency of the intermediate
shaft.
Pay special attention to the above when replacing gear couplings or roller chain couplings with disk couplings.
Long Spacer Type
Single Type + Floating intermediate shaft + Single Type
Spacer Type + Fixed intermediate shaft + Spacer Type
Spacer Type + Floating intermediate shaft + Spacer Type