The values for i and a
th
can be found in the selection tables.
The values for a
thEL
and fB
T
can be found in the corresponding tables in this chapter.
The value for the torque of the motor at operating point M
op
with the determined average input speed n
1m*
can be found in the motor characteristic curve in the chapter Torque/speed curves. Note the size, nominal
speed n
N
and cooling type of the motor. The figure below shows an example of reading the torque M
op
of a
motor with convection cooling at the operating point.
Operating factors
Parameter a
thEL
Mounting position a
thEL
EL1, 2 1.0
EL3, 4, 5, 6 1.1
Operating mode fB
op
Uniform continuous operation 1.00
Cyclic operation 1.25
Reversing load cyclic operation 1.40
Run time fB
t
Daily runtime ≤ 8 h 1.00
Daily runtime ≤ 16 h 1.15
Daily runtime ≤ 24 h 1.20
Temperature fB
T
Motor cooling Surrounding temperature
Motor with forced ventilation ≤ 20 °C
≤ 30 °C
≤ 40 °C
0.9
1.0
1.15
Motor with convection cooling ≤ 20 °C
≤ 30 °C
≤ 40 °C
1.0
1.1
1.25
Notes
• The maximum permitted gear unit temperature (see the "Other product features" chapter) must not be
exceeded. Doing so may result in damage to the geared motor.
• For braking from full speed (for example when the power fails or when setting up the machine), note
the permitted gear unit torques (M
2acc
, M
2NOT
) in the selection tables.
10 Khelical bevel geared motors 10.6 Project configuration
369
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