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1
0,9
0,8
4.4.2 Efficiency Correction factor
0,7
0,6
The efficiency of a Harmonic Drive® Strain Wave Gear depends on the load torque. When the load torque is lower than the
0,5
rated torque, the efficiency value decreases. The correction factor K can be determined with illustration 36.2. When the load
500 min
-1
0,4
1000 min
-1
torque is higher than the rated torque, the correction factor is K = 1.
2000 min
-1
0,3
3500 min
-1
Calculation of torque factor V
0,2
0,1
Equation 37.1
0
0
0,1
0,2
T
V =
T
N
sch
Illustration 37.2
1
0,9
0,8
0,7
0,6
0,5
500 min
-1
0,4
1000 min
-1
2000 min
-1
3500 min
0,3
-1
0,2
0,1
0
0
0,1
0,2
4.4.3 Efficiency Correction Value
The SHG-2UH Series Unit is equipped with two support bearings and two shaft seals running on the hollow shaft, having an
large impact on the gear's efficiency. The impact depends on the gear size and ratio and is considered by the correction value η
Illustration 37.3
0
-2
-4
-6
i = 80, 100
-8
i = 120, 160
-10
1021387
12/2018
with:
T = Actual torque
0,3
0,4
0,5
0,6
0,7
0,8
T
= Rated torque at rated speed
N
Drehmomentverhältnis V
0,3
0,4
0,5
0,6
0,7
0,8
Torque ratio V
i = 30
i = 50
14 17 20 25 32
40 45 50
Size
V02
0,9
1
0,9
1
58
.
e
37
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