technical data Coupling Selection and Procedure
If you would like to see the selection procedures and important points, please proceed below.
If you would like to narrow down or tentatively select a product series,
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If your usage conditions have been decided and you would like a detailed selection,
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ECHT-FLEX Coupling NES Series Selection
1. Calculation of correction torque
1-1.
| Load Type | Uniform Load | Moderately fluctuating load | Extremely fluctuating load |
|---|---|---|---|
| Service factor (SF) | 1.2 | 1.4 | 1.5 |
1-2. When connecting with a general-purpose motor, etc.
T = 9550 × P n
- T' = T × SF
- T = Load torque N・m
- P = transmitted power kW
- n = rotational speed r/min
- T' = Corrected torque N・m
| Load Type | Type of engine | ||||
|---|---|---|---|---|---|
| General-purpose electric motors, gas turbines | engine | ||||
| When the moment of inertia is small |
When the moment of inertia is large |
4-cylinder | 6-cylinder | 8-cylinder | |
| Uniform Load | 1.5～1.75 | 1.75～2.0 | 2.5～4.0 | 2.0～2.5 | 1.5～2.0 |
| Moderately fluctuating load | 2.0～2.5 | 2.5～3.0 | 4.0～5.0 | 2.5～3.5 | 2.0～3.0 |
| Extremely fluctuating load | 3.0～4.5 | 4.5～6.0 | 4.5～5.5 | 3.0～4.0 | 2.5～3.5 |
- *If an impact load is applied, multiply the maximum torque that the motor can produce by an impact coefficient of 1 to 2.5 to obtain the corrected torque.
- * Make sure that no torque exceeding the friction transmission torque of the shaft hole (see each product page) is applied, even momentarily, including the starting torque.
2. Shaft diameter
Make sure that the mounting shaft is within the range of shaft diameters that can be mounted on the coupling.
For clamp types, make sure that the compensation torque calculated in step 1 is within the transmission torque of the clamp.
If you are installing it on a hollow shaft, you will need to check the strength, so please contact us.
3. Precautions when driving servo motors
In a Ball screw drive system using a servo motor, due to the characteristics of the servo motor, oscillation can be amplified depending on the natural frequency of the entire Ball screw drive system and the electrical control status, resulting in large vibrations and abnormal noise.
In such cases, you can avoid this by adjusting the torsional rigidity and moment of inertia of the entire drive system to increase the torsional natural frequency of the mechanical system, or by adjusting the servo gain using the servo motor's electrical control tuning function.
4.Model selection
Please select ECHT-FLEX coupling that satisfies items 1 to 3 above from kW ratings table.
