Technical Data  Coupling  Sizing and procedure

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ECHT-FLEX Coupling 　NER Series 　Selection

1.Correction torque calculation

1-1. When driven by servomotor

Calculate the correction torque by multiplying the servomotor’s maximum torque by the service factor (SF) shown in Table 1 for the load type.

Table 1. Service factor (SF) When connected to servomotor
Load type Uniform load Moderately variable load Highly variable load
Service factor (SF) 1.2 1.4 1.5

1-2. When connected to general-purpose motor

Calculate the correction torque by multiplying the load torque calculated using the formula below by the service factor (SF) shown in Table 2 for the load type.

T = 9550 × P n   T = 974 × P n

  • T' = T × SF
  • T = Load torque N・m {kgf・m}
  • P = Power transmission kW
  • n = Speed r/min
  • T' = Correction torque N・m {kgf・m}
Table 2. Service factor (SF) General purpose motor
Load type Motor type
General purpose motor, gas turbine Engine
Small moment of inertia Large moment of inertia Four cylinders Six cylinders Eight cylinders
Uniform load 1.5～1.75 1.75～2.0 2.5～4.0 2.0～2.5 1.5～2.0
Moderately variable load 2.0～2.5 2.5～3.0 4.0～5.0 2.5～3.5 2.0～3.0
Highly variable load 3.0～4.5 4.5～6.0 4.5～5.5 3.0～4.0 2.5～3.5
  • ※If shock loads will be applied, calculate the correction torque by multiplying the motor’s maximum output torque by a shock factor of 1 to 2.5.

2.Shaft diameter

Check that the shafts to be mounted are within the coupling’s range of mountable shaft diameters.

3.Show model No.s

ECHT-FLEX Couplings satisfying Items 1 to 2 above should be chosen from the transmission capacity table.

Note ．Long spacer type rotation limit

When long spacer types are used at high speeds, the rotation speed needs to be checked to avoid the resonance point.

When selecting long spacer types, check each J dimension and whether its rotation speed is within the limit.

Select by increasing the model number if the rotational speed used is over the listed rate.

If the operation speed is not in the ranges shown below, please contact us.

Table 3.Long Spacer Type rotation limits (Dimension 'J') Units (mm)
Model No. /Rotational speed used
(r/min)		 3600 2000 1800 1500 1200 1000 900 750 720 600 500 400 300 200 150
NER59W 1470 1960 2070 2260 2520 2750 2900 3170 3240 3540 3870 4330 4990
NER93W 1600 2130 2240 2450 2730 2980 3140 3440 3510 3840 4200 4690 5400
NER230W 1930 2560 2700 2950 3290 3590 3790 4140 4220 4620 5060 5650
NER360W 2080 2760 2910 3180 3540 3870 4080 4460 4550 4980 5440
NER630W 2230 2960 3110 3400 3790 4140 4360 4770 4870 5330
NER850W 2240 2970 3120 3410 3800 4160 4380 4780 4880 5340